How we approach rooflight upstands & kerbs in Isleworth
Our rooflight upstands & kerbs service in Isleworth covers insulated kerbs built and waterproofed to suit your rooflight. Every job starts with a survey of the opening, the roof covering and the room below, and a fixed written price.
Many London roofs are reached only through the house or over neighbouring property, so lifting heavy glass is planned at survey rather than on the day. Rooflight upstands & kerbs suit roofs where the old kerb is low, cold or leaking.
Isleworth is around 15 km from central London, and we survey and fit throughout that part of Greater London, including the TW7 district.
Specification options
- Timber upstands with insulation
- Upstands to suit single-ply, felt, GRP or liquid roofs
- Raised upstands for deep green or ballasted roofs
- Proprietary insulated kerbs
- Internal plaster-box linings
- Built square to the rooflight size
- Fixings and falls agreed with the rooflight maker
What to check first
- Minimum upstand height is set by the rooflight manufacturer — commonly 150 mm above the finished roof
- Membrane compatibility with the rooflight's sealants
Consents for rooflight upstands & kerbs in Isleworth
Most rooflights on English houses do not need planning permission, provided they keep within 150 mm of the roof surface and below the ridge line. Listed buildings need listed building consent, flats have no householder permitted development rights, and an Article 4 direction can remove the rights in some conservation areas.
Under Approved Document L, a rooflight added to an English home must achieve at least 2.2 W/m²K (horizontal plane), and a roof window 1.4 W/m²K or Window Energy Rating Band B. In an extension, glazing including rooflights is normally limited to 25% of the new floor area plus any windows or doors the extension covers, unless a whole-house calculation shows otherwise.
Our planning guide covers each nation in more detail.
What do rooflight upstands & kerbs cost in Isleworth?
Guide prices for rooflight upstands & kerbs in Isleworth are the same as anywhere we work — what changes the price is the job: access, structure, scaffold and finishing.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Large or raised upstand | £715 – £1,195 | £595 – £995 |
| Standard insulated upstand Typical | £475 – £715 | £395 – £595 |
| Small upstand on new roof | £355 – £475 | £295 – £395 |
What happens next
- Send the details. Postcode, rough size and a photo of the roof and room.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Rooflight upstands & kerbs near Isleworth
Related work in Isleworth
Common questions
Does every rooflight need an upstand?
Flat and dome rooflights do. Pitched roof windows use flashing kits instead.
Can I build the upstand myself?
Your builder can, to our drawing. We check it before the rooflight is fitted, because the unit must sit square and level.
What roof coverings do you work with?
Single-ply, EPDM, felt, GRP and liquid-applied systems — or we coordinate with your roofer.
Is the survey in Isleworth free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
Can you work alongside my builder in Isleworth?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
