Rooflight Installation & Replacement
Your Rooflights Are Leaking, Yellowed, or Letting Heat Escape. We Replace and Install Them Properly.
Rooflights that leak, rooflights that have gone opaque, rooflights that are no longer safe to walk near. We supply, install, and replace all types — properly integrated into your roof waterproofing.
Why Rooflights Are the Weak Link on Most Roofs
Rooflights are penetrations through your roof membrane — and every penetration is a potential leak path. When they are poorly detailed, installed with mastic seals, or left to deteriorate, they become the single biggest source of water ingress on commercial buildings.
Worse still, aged polycarbonate rooflights become brittle and fragile. Every year in the UK, workers fall through rooflights that looked solid from below. Under CDM 2015, building owners have a legal duty to ensure rooflights are non-fragile.
We replace failing rooflights with modern, thermally efficient, non-fragile units — properly waterproofed into your roof system.
Warning Signs We See
- Yellowed, discoloured polycarbonate that blocks natural light
- Cracked or crazed domes letting water in
- Mastic sealant around kerbs that has split or shrunk
- Condensation forming between rooflight skins
- Single-skin rooflights with no thermal insulation value
- Fragile rooflights with no fall-through protection
What We Install
Every rooflight type, properly specified and integrated into your roof system.
Watertight Integration
Every rooflight is detailed into the roof membrane as a single waterproof assembly. No mastic joints, no silicone seals that fail within five years.
Natural Daylight
Reduce your lighting costs by up to 60%. Modern rooflights flood internal spaces with diffused natural light — improving working conditions and cutting energy bills.
Thermal Performance
Triple-skin polycarbonate and double-glazed glass units that meet current Building Regulation U-values. No more heat pouring out through single-skin barrel vaults.
Non-Fragile to ACR[AB]001
All rooflights specified to meet the non-fragility requirements of ACR[AB]001 and the CDM Regulations. Critical for any commercial or industrial building.
Dome, Pyramid & Flat Glass
Polycarbonate domes, GRP pyramids, flat glass units, continuous barrel vaults — we supply and install all rooflight types to suit your building and budget.
Over-Roofing Compatible
When we refurbish your roof, we replace the rooflights at the same time. One contractor, one programme, one guarantee covering everything.
Rooflight Types We Work With
Commonly Asked Questions
My rooflights have gone yellow and brittle. Do they all need replacing?
Almost certainly, yes. Yellowed polycarbonate has lost its UV stabiliser and will be structurally compromised — meaning it may no longer be non-fragile. That is a serious safety risk under CDM 2015. We will survey every rooflight, test fragility where needed, and give you a clear replacement schedule prioritised by risk.
Can you replace rooflights without stripping the whole roof?
Yes, in most cases. We remove the old rooflight, prepare the upstand, and install the new unit with a liquid-applied membrane detail that ties into your existing roof system. If the surrounding membrane is also failing, we will tell you — but standalone rooflight replacement is a routine job for us.
What is the difference between polycarbonate and glass rooflights?
Polycarbonate is lighter, cheaper, and available in dome and barrel vault profiles. Glass offers better clarity, longer UV life, and superior aesthetics — ideal for offices, retail, and residential. We specify both depending on the application, budget, and building use.
How much do replacement rooflights cost?
A standard 600x600mm triple-skin polycarbonate dome on a new upstand kerb typically costs £400–£700 installed. Larger glass units, opening rooflights, and bespoke sizes cost more. We will give you a fixed-price quote after survey.
Do you install opening and ventilation rooflights?
Yes. Manually opening, electrically actuated, and AOV (automatic opening vent) smoke ventilation rooflights — all supplied and installed. AOV systems are tested and commissioned to meet Building Regulation requirements for smoke extraction.