Roof skylights and windows protect property value and safety by preventing leaks, damp, and energy loss. Across London and the Home Counties—including Kent, Surrey, West Sussex, and Berkshire—your project receives expert care, regulatory compliance, and long-term durability. Every installation is delivered with meticulous workmanship, using materials proven to perform.
With over 20 years’ experience, Which Trusted Trader and CITB accreditations, and premium suppliers like Welsh Slate, ALM Lead, and Kemper, you benefit from verified expertise on every job.
Book a free survey today and protect your property.
Overlooking roofing issues invites leaks, damp, energy loss, and slow but severe structural problems. Waiting only raises risks and costs for any property owner.
Professional Roof Skylight & Roof Window Installations protect against these risks, ensuring ongoing weatherproofing, insulation performance, and compliance. Whether you’re a homeowner seeking peace of mind, a landlord focused on value, or a business that needs guaranteed safety and reliability, proactive roofing care is always a secure investment.
Roof Skylight & Roof Window Installations cover everything from installations to repairs, upgrades, and restorations—serving homes, commercial properties, and heritage sites. Our methods focus on high performance, regulatory compliance, and proven materials from trusted suppliers. Every service is tailored to your property type, prioritising safety, aesthetics, and long-lasting value.
Every Roof Skylight & Roof Window Installations project is adapted to property type, roof structure, and environmental demands. Tailoring ensures compliance with regulations, minimises disruption, and maximises long-term value. From homes and businesses to industrial sites and listed heritage buildings, our flexible approach guarantees roofing solutions that meet unique needs while delivering safety, efficiency, and reliability.
Homes, extensions, and listed buildings.
Offices, retail, schools, and hospitality.
Warehouses, factories, and logistics sites.
Every Roof Skylight & Roof Window Installations project follows proven steps with quality materials. Whether a new installation, upgrade, or repair, each layer adds durability, safety, and efficiency—tailored to protect your property and meet regulatory standards.
Get a free, no-obligation quote today.
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Accredited by Which Trusted Trader, CITB, and approved by Kemper and Westwood, our team delivers safe, compliant, and warranty-protected Roof Skylight & Roof Window Installations projects. These credentials mean guaranteed standards and long-term assurance—reinforced by the positive client reviews that consistently highlight quality, professionalism, and trust.
Complete reroofing. Living in Singapore at the time and T was super responsive and communicative.
Replacement of lead box gutter and new flashing to parapet wall. I had an excellent experience using James and the team. He was very prompt in all aspects of communication and completed a first class job. Really pleased.
James completed some repairs on our roof and replaced some of our pebble dash by the roof as well. He was very thorough and fixed everything. He kept us really informed by taking photos and showing us what he did and keeping us updated. It also went onto our neighbours roof and he did the same fo...
We had a leak in our bedroom and James fixed the roof for us to stop it from leaking. All the work came with a warranty. The work that was carried out was good. James and his team were polite, and did all the work quickly and without too much interruption to our day-to-day lives. Would recommend ...
J G Leadworks have repaired and replaced the roofs and gulleys over our warehouse and workshops which have meant both areas are now watertight
James and team were incredibly responsive to my request to look at a serious leak issue on my flat roof. They did a very thorough investigation and explained in detail the issue and gave a fair quote. They were quick to book in and complete the work and have checked in afterwards a few times to m...
James was quick to respond to the initial contact and was able to work around some time constraints I had. He explained what needed doing clearly and was happy to answer follow up questions. He took pictures to show each stage and I feel confident in the work that was done by James and the team. ...
JG Roofing were very easy to work with. Their quote was sensible and they stuck to that figure. They completed many repairs to my roof including, rebuilding a leaded gutter, reinforcing rotten rafters, rebuilding a long felted gutter and felting parapet walls, resurfacing and felting a flat roof,...
Planning and legal checks protect clients from costly errors, delays, and non-compliance, ensuring roofing projects meet regulatory and safety requirements.
Permission is typically required for listed properties, conservation areas, or major roof alterations. All projects must also satisfy Building Regulations, including Part A (structural safety) and Part L (energy efficiency), ensuring compliant and future-proofed installations.
Our team manages the full process, from initial surveys to legal guidance, preparing documentation, and liaising with local authorities where needed. Whether working on modern homes or heritage sites, we ensure every project is delivered legally, safely, and with minimal disruption—providing complete reassurance and peace of mind to property owners.
Every project unites skilled workmanship with rigorously tested materials.
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With 25 years of experience in lead sheet roofing, James is a trusted expert in heritage roofing, slate, and tiling. His knowledge of traditional methods, paired with modern compliance, makes him a go-to specialist for projects that demand both craftsmanship and durability.
Roof Skylight & Roof Window Installations provides lasting protection, efficiency, and value, delivering durable, compliant roofing solutions that safeguard every type of property investment.
Selecting Roof Skylight & Roof Window Installations involves balancing durability, budget, compliance, and aesthetics to secure the best-fit roofing solution for your property.
Why Clients Choose JG Leadwork and Roofing
With decades of trade experience, our teams understand the unique demands of London and Home Counties roofing. From heritage-listed properties to contemporary extensions, we adapt solutions to local regulations, weather conditions, and architectural styles with precision.
Accredited by Which Trusted Trader, CITB, and approved by Kemper, Westwood, IKO, ALM, and other leading suppliers.
These credentials guarantee safety, compliance, and access to manufacturer-backed warranties, giving clients peace of mind that their project meets the highest professional standards and benefits from warranty protection.
Our heritage projects use Welsh Slate and handmade clay tiles for authenticity, while leadwork is delivered to Lead Sheet Association (LSA) standards. Commercial installations employ Kemper and Westwood liquid systems for durability and efficiency. Each example demonstrates our reliability, blending traditional craftsmanship with modern performance.
Our workforce includes skilled roofers, heritage specialists, and safety-certified installers.
Every roofer holds NVQs, receives ongoing CPD training, and is qualified in both modern flat systems and traditional techniques, including slate and leadwork.
Team structure ensures projects run smoothly—surveyors identify needs, installers deliver with precision, and supervisors oversee compliance. This approach minimises disruption, accelerates timelines, and guarantees consistent quality across residential, commercial, and industrial roofing projects.
Every project is regulation-compliant, warranty-backed, and focused on long-term results.
Client testimonials and case studies confirm our track record, with projects praised for professionalism, durability, and customer support.
We go beyond installation with aftercare packages, maintenance support, and open communication at every stage. Property owners gain reassurance that JG Leadwork and Roofing stands behind its work. Book a free survey today and discover why homeowners, landlords, and businesses trust us with their roofing.
Get a free quote, rapid response, and expert service across London and the Home Counties. Contacting JG Leadwork and Roofing is your simple first step to dependable roofing solutions.
We source materials from leading suppliers including Supreme and IKO felt systems, Kemper, Westwood and Proteus liquid systems, Welsh Slate, handmade clay tiles, ALM Lead Mills, and Nicholson Air Track. These trusted brands guarantee durability, compliance, and warranty-backed performance across flat, pitched, heritage, and commercial roofing projects.
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For homes, Roof Skylight & Roof Window Installations safeguards comfort and enhances kerb appeal with durable, energy-efficient systems. Whether modern extensions or traditional pitched roofs, tailored solutions improve living standards and protect property value.
For businesses, Roof Skylight & Roof Window Installations delivers cost-effective, large-scale installations with minimal disruption. Projects are planned around operations, with safety compliance, energy performance, and flexible scheduling built in—supporting offices, retail, schools, and industrial facilities with reliable, regulation-ready outcomes.
For heritage properties, Roof Skylight & Roof Window Installations combines authentic materials such as Welsh slate, handmade clay tiles, and ALM lead with skilled conservation techniques. Listed building consent and conservation requirements are fully managed, ensuring traditional character is preserved while integrating modern weatherproofing. This careful balance provides long-term durability without compromising historic integrity or aesthetic value.
JG Leadwork and Roofing delivers Roof Skylight & Roof Window Installations across housing, commercial, heritage, and public sectors. Every industry comes with unique requirements, from safety and compliance to efficiency and conservation. Our adaptability ensures projects are delivered with precision and professionalism—whether safeguarding homes, supporting business continuity, preserving history, or protecting critical public and healthcare facilities.
Durable roofing installed with minimal disruption, ensuring safe, regulation-compliant workspaces for staff and visitors.
High-standard, compliance-focused solutions protect community facilities while meeting strict safety and regulatory obligations.
Heavy-duty roofing tailored for wide spans, ventilation, and long-term maintenance efficiency.
Authentic materials and sensitive methods preserve historic character while adding modern protection.
Weatherproof systems that enhance kerb appeal and guarantee uninterrupted trading for outlets.
Tailored roofing improves guest comfort, safety, and ambience across hotels, restaurants, and venues.
Safe, durable systems designed for schools and universities with minimal learning disruption.
Specialist roofing solutions built for hygiene, safety, and regulatory compliance in medical environments.
Our team of NVQ-qualified roofers, LSTA-trained specialists, and health & safety-compliant professionals bring decades of combined experience. Every project is delivered with meticulous attention to detail, ensuring safe practices and consistent quality across flat, pitched, heritage, and commercial roofing disciplines.
Expertise includes heritage leadwork, slate and tile roofing, modern flat systems, and drone-assisted roof surveys. Ongoing CPD training ensures adaptability to both traditional craftsmanship and the latest innovations—giving clients confidence that every roof is built or repaired with proven skill and care.
A thorough survey highlights existing issues, structural considerations, and upgrade opportunities, ensuring the best-fit solution is identified from the very beginning.
Transparent, itemised quotes detail costs, timelines, and materials—giving you complete clarity and confidence before work starts, with no hidden surprises.
Scaffolding, access solutions, and robust safety measures are put in place to safeguard both property and people throughout the project.
Skilled roofers complete the work using accredited materials and proven techniques, delivering durable, compliant results while keeping disruption to a minimum—whether for repairs, replacements, or new installations.
Each stage is inspected against manufacturer standards and Building Regulations, with photographic documentation provided for transparency and peace of mind.
Each stage is inspected against manufacturer standards and Building Regulations, with photographic documentation provided for transparency and peace of mind.
In a competitive roofing market, many providers look the same on paper. JG Leadwork and Roofing stands out through proven expertise, accredited methods, and specialist techniques. Our combination of traditional craftsmanship and modern technology makes us the safer, smarter choice across residential, commercial, industrial, and heritage projects.
In a competitive roofing market, many providers look the same on paper. JG Leadwork and Roofing stands out through proven expertise, accredited methods, and specialist techniques. Our combination of traditional craftsmanship and modern technology makes us the safer, smarter choice across residential, commercial, industrial, and heritage projects.
At JG Leadwork and Roofing, every project follows a structured QA process. Each stage—materials, installation, safety, and final sign-off—is measured against manufacturer specifications and UK Building Regulations to ensure durability, compliance, and warranty-backed performance across all roofing services.
Projects are only signed off once all QA checks are complete, giving clients confidence in long-term performance, structural safety, and insurance-backed peace of mind.
Every Roof Skylight & Roof Window Installations project by JG Leadwork and Roofing is delivered in strict alignment with UK Building Regulations and recognised frameworks. This ensures structural safety, energy efficiency, durability, and protects warranties and insurance coverage across residential, commercial, industrial, and heritage properties.
Clients can be confident their project is completed legally, safely, and insurance-ready—delivering long-term performance, compliance assurance, and complete peace of mind.
Property owners often wonder about Roof Skylight & Roof Window Installations—from costs and timescales to permissions. Below, you’ll find straightforward, trustworthy answers to the most frequent and practical queries.
Roof leaks triggered by heavy rain are a top concern for property owners, contractors, and developers across the UK. These leaks aren’t just an inconvenience; left unchecked, they rapidly lead to damp insulation, plasterboard failure, timber rot, and in some cases structural jeopardy. Knowing the underlying causes helps you safeguard your property, support insurance compliance, and limit repair costs. In nearly all cases, leaks stem from breakdowns in waterproofing barriers, failed weatherproof details, or environmental factors that overwhelm even well-installed systems.
On both pitched and flat roofs, your first line of defence is the waterproof membrane—felt, single-ply, or similar. Over time, exposure to UV rays and the UK’s freeze–thaw cycle (where trapped water expands as it freezes) causes membranes to dry, split, or become brittle. These changes create routes for rainwater to bypass intended drainage. Capillary action, where water travels through tiny gaps against gravity, can draw water deep into cracks as small as a pinhole.
Symptoms include blistering, surface cracks, or bubbling. When heavy rain hits, even tiny breaches allow water to penetrate insulation or roof decks, causing hidden decay, damp ceilings, or, in period properties, damage to structural timbers. Standard built-up felt in the UK often lasts 15–25 years under average conditions; frequent standing water or sun exposure accelerates deterioration.
Flashing—strips of metal (commonly lead or aluminium) or proprietary waterproofing material—protects every junction where the roof meets walls, chimneys, skylights, or vents. Over time, or if poorly installed, flashings can lift, split, or corrode, especially as buildings settle or as temperatures fluctuate.
Warning signs are stains along wall–ceiling joints, damp patches beneath valleys or skylights, or dark streaks at eaves after storms. Soggy insulation, peeling paint, or a musty loft odour often trace back to flashing defects. If left unrepaired, surrounding timbers may decay, and warm, trapped air can promote mould or interstitial condensation within insulation layers.
Flat roofs are particularly prone to ponding—standing water that doesn’t drain within 48 hours of rainfall. UK Building Regulations (Part L) require new flat roofs to be laid to a fall (typically 1:40 or steeper) for effective drainage. Poor construction, sagging decks, or compressed insulation can leave water pooling after storms. Prolonged ponding speeds up membrane ageing, encourages surface algae, and during winter freeze–thaw cycles, can split the waterproofing.
Insulation and ventilation are equally vital. Inadequately insulated roofs let cold surfaces meet warm, moist indoor air, leading to interstitial condensation—hidden moisture forming within roof spaces. This appears as yellow ceiling stains or unexpected mould patches, even where no clear leak exists. Unventilated cavities—especially in older or converted lofts—are at the highest risk.
Determining the exact cause of a roof leak calls for a stepwise investigation:
| Key Cause | Typical Symptom | Risk if Ignored | Indicative Remedy |
|---|---|---|---|
| Membrane cracks/age | Damp spots, bubbling | Rot, internal damp | Patch or full membrane replacement |
| Flashing/joint failure | Stains, damp at edges | Timber decay, mould, leaks | Renew flashings, reseal joints |
| Standing water (ponding) | Water pools, green film | Premature ageing, internal leaks | Correct slope, improve drainage |
| Inadequate ventilation | Yellow stains, mould | Condensation, hidden decay | Upgrade insulation, add ventilation |
Understanding the mechanism behind a leak—whether it’s membrane breakdown, flashing failure, poor drainage, or condensation—is essential for targeted repairs and long-term prevention. Regular checks, particularly after severe weather, help catch problems early and protect every type and age of property.
When comparing the cost of slate and tile roofing in the UK, several factors come into play that affect more than just the visible finish. The differences in natural versus manufactured materials, installation technique, compliance demands, and market-related pressures all shift the total cost. Understanding these factors is essential for budgeting, meeting Building Regulations, and making choices that match a property’s needs in London, Sussex, Surrey, or Kent. Below is a structured breakdown of the issues to consider if you are weighing slate against tile for your roof.
The material cost is a major driver in the price gap. Slate—a natural stone—usually carries a higher price because it must be quarried, graded, and carefully transported. Premium options (such as Welsh slate) can make this even steeper. Tiles (clay or concrete), being manufactured, are generally less expensive and easier to source in the necessary quantities. Slate installation also produces more waste due to trimming and variations in natural stone, pushing up the quantity needed.
| Roofing Type | Typical Supply Cost per m² | Attributes |
|---|---|---|
| Slate | £35–£60 | Durable, heritage appearance |
| Clay Tile | £25–£45 | Lighter, traditional style |
| Concrete Tile | £18–£30 | Affordable, widely available |
Why this matters: Material cost often makes up 30–50% of a roofing project, and the intended lifespan and look may demand more investment up front.
Fitting a slate roof is a more specialist process. Each slate requires precise placement, often hand-nailed, and must follow British Standards (BS 5534, which covers slating, tiling, and shingles). This raises labour time and the need for skilled slaters. Complexity increases further on roofs with valleys, hips, or decorative details. Tiles make use of pre-formed nibs or interlocking edges, which accelerates installation and allows for easier repairs later. In busy markets like London, labour for slate is typically 25–40% higher than for tiles because of both the time taken and the scarcity of qualified trades.
Why this matters: Labour can make up 40–60% of the project cost. Delays or a shortage of skilled fitters may further escalate price or extend timescales.
All UK pitched roofs are subject to BS 5534 for wind loading, fixings, and weatherproofing. In conservation areas or listed buildings, planners may insist on like-for-like material, colour, or thickness—often meaning natural slate to preserve historic character. These conservation requirements can restrict cheaper alternatives or the use of mass-produced tiles altogether. Part L of the Building Regulations now also requires improved roof insulation (“U-value,” or heat loss, standards). For some reroofing projects, insulation upgrades may be easier if using tile rather than slate, avoiding an overly thick roof profile that could breach local height or visual rules.
Why this matters: Regulatory and heritage restrictions can force a choice of premium materials and techniques, impacting both cost and project scope.
Costs in London and the South East are shaped by several local market pressures:
Large, complex roofs or those in conservation zones can see further cost increases due to the regulatory focus on detail and compliance.
| Factor | Slate | Tile | Why It Matters |
|---|---|---|---|
| Material cost (m²) | £35–£60 | £18–£45 | Main driver for upfront spend |
| Labour intensity | High (specialist skills) | Medium (general roofer) | Affects project length/cost |
| Regulatory demands | Stringent (heritage roles) | More flexible (standard jobs) | May lock out cheaper options |
| Installation speed | Slower, manual | Faster, interlocking system | Influences scaffolding costs |
| Maintenance ease | Needs specialist | Easier to find replacement | Long-term repair implications |
On balance, slate roofing is typically 25–40% more expensive to instal than tile, but it can last over 80–100 years compared to 40–60 for tile. Site specifics, property status, and local regulations may shift the calculus, and a full cost assessment should consider both upfront spend and expected lifespan.
The time required for a new roof, skylight, or roof window installation in the UK varies depending on roof type, property size, weather, and technical complexity. For a typical semi-detached house, pitched roof installations with skylights commonly take 2 to 5 days. Smaller flat roof window projects may need as little as 1–3 days. Larger buildings or heritage properties frequently require a week or more due to design, access, and review procedures. Setting clear expectations is vital for cost planning, minimising disruption, and meeting regulatory or warranty targets—especially for landlords and facilities teams responsible for occupied buildings.
Installation overruns often lead to extended scaffold rental, prolonged exposure of interiors, and delays in re-occupancy. Timely execution not only safeguards the property but also ensures compliance and avoids insurance complications in case of adverse weather or later claims.
Most UK installations begin with a thorough survey to determine existing conditions and requirements. Timelines often resemble:
Properties with awkward access, complex leadwork, or large spans typically extend beyond baseline timeframes. For listed or historic buildings, allow additional days (or weeks) for specialist groundwork, regulatory review, and matching of heritage details. Every project should end each workday with the roof rendered weather-tight.
Several property and climate influences can accelerate or delay a roof or skylight project:
Heritage sites introduce variables—planning permission, bespoke components, and more detailed oversight—all of which extend project timelines.
Routine maintenance is essential for getting the maximum lifespan from roof windows and skylights:
Early detection of slipped tiles, shrinking membranes, or blocked outlets keeps minor maintenance from becoming full-scale repair jobs.
| Material | Typical Lifespan | Inspection Frequency | Maintenance Needs |
|---|---|---|---|
| **Slate** | 80–100 years | Every 5 years | Replace broken slates, check for movement |
| **Clay Tile** | 50–75 years | Every 3–5 years | Check for cracks, re-bed ridge tiles |
| **Felt (Torch-on)** | 10–20 years | Every 2 years | Reseal edges, patch minor tears |
| **Liquid System** | 25–40 years | Every 3 years | Check and recoat joints as required |
| **EPDM/PVC Flat** | 20–30 years | Every 2–3 years | Inspect seams, clear ponding, patch holes |
Long-life materials like slate and clay offer decades with minimal routine care, but all roofs and skylights benefit from pre-emptive, scheduled inspections and quick repairs. This approach prolongs performance, preserves warranties, and protects property under typical UK climate and building conditions.
Installing roof skylights and roof windows is an investment that can transform a property—but clarity on true cost, clear warranty terms, and knowing whom to trust are what separate a wise upgrade from a costly mistake. The total outlay depends on factors like system type, access, and compliance requirements. Costs and warranties aren’t just details for the paperwork: they determine your property’s energy profile, maintenance burden, and even future sales value. For homeowners, clarity avoids nasty surprises; for commercial landlords and developers, strong warranties and certified installers help protect capital and de-risk the investment in an ever-tighter regulatory climate.
The price of installing a skylight or roof window varies widely based on the scope of work, property type, and installation complexity. For a simple residential roof window, total costs (supply and fit) usually range from £1,000 to £2,800 per unit, depending on materials, internal finishing, and access. Larger custom skylights or commercial roof lanterns can reach £4,000 to £10,000 each. If remedial structural works, heritage matching, or specialist solutions (like high-spec glass or remote controls) are required, expect upper-range pricing. Below is a typical comparison table for common project types:
| Service Type | Typical Range (UK) | Key Influences |
|---|---|---|
| Basic Roof Window Fit | £1,000 – £2,800 | Size, finish, access, flashing |
| Custom Skylight | £2,500 – £10,000+ | Structure, materials, shape |
| Flat-to-Pitched Upgrade | £7,500 – £18,000+ | Structural work, insulation, regs |
| Full Roof Replacement | £6,000 – £20,000+ | Area, complexity, insulation |
Labour (often two specialists for up to a full day per window), scaffolding, weatherproofing layers, and site remediation can tip the cost upwards. Commercial and heritage projects involve stricter oversight and typically sit at the top end.
A credible installation should always come with an insurance-backed warranty, typically covering periods from 10 to 20 years depending on the system and installer credentials. Such warranties give financial cover if either the product fails or the installer ceases trading. Typical coverages include materials (glass, frames, seals), workmanship (flashings, integration with the existing roof), and occasionally the structural frame if replaced. Many warranties are contingent on using an accredited installer and following strict installation protocols.
For buyers, a valid warranty is often required to satisfy mortgage providers, insurance underwriters, and building control inspectors—especially important for Part L compliance (energy efficiency). Robust warranties don’t just offer peace of mind; they unlock future flexibility by removing obstacles to resale or property revaluation where compliance documentation is scrutinised.
Reputation, track record, and training are the foundation of trust. Look for an accredited installer with verifiable credentials—such as NVQ qualifications, CITB training, or membership of schemes like Which Trusted Trader, TrustMark or FENSA. Installers who hold these credentials regularly undergo independent audits, up-to-date technical training, and compliance reviews. Why does this matter? Accredited teams reduce the risk of errors, avoid building regulation breaches, and maintain access to comprehensive manufacturer warranties (which can be withdrawn if standards are not met). Only certified installers can register works with local authorities and provide the proof required for insurance-backed guarantees.
Attempting to save on upfront costs by cutting corners is a shortcut to disappointment and financial risk. Common cost-cutting traps include reusing old or rotten roof decking, skipping essential insulation upgrades, failing to specify ventilation in accordance with building regs, or neglecting to use proper waterproofing membranes. These shortcuts may lower the invoice but quickly lead to heat loss, condensation, timber decay, or leaks. Even worse, non-compliant work renders most insurance policies void and leaves property owners exposed in the event of a claim or sale. Historic claims data and remediation projects consistently show that the majority of costly failures stem from ignored standards rather than material faults—a compelling reason to demand full transparency and documented installation methods even before a quote is accepted.
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