What do rooflight upstands & kerbs in Gerrards Cross involve?
Thinking about rooflight upstands & kerbs in Gerrards Cross? The short answer: insulated kerbs built and waterproofed to suit your rooflight. The longer answer depends on your roof, which is why we survey before we price.
Larger gardens in much of the South East mean deeper rear extensions, and deeper rooms need light from above rather than only from the doors. In Gerrards Cross, as anywhere, rooflight upstands & kerbs are the usual choice for roofs where the old kerb is low, cold or leaking.
From Gerrards Cross to Chalfont St Peter, Uxbridge and Rickmansworth, the same survey-first process applies: measure, specify, fix the price, then fit.
Choices for your Gerrards Cross project
- Internal plaster-box linings
- Upstands to suit single-ply, felt, GRP or liquid roofs
- Timber upstands with insulation
- Raised upstands for deep green or ballasted roofs
- Upstand repairs and rebuilds
- Built square to the rooflight size
- Correct height above the finished roof
What to check first
- Membrane compatibility with the rooflight's sealants
- Minimum upstand height is set by the rooflight manufacturer — commonly 150 mm above the finished roof
Planning, building control and Gerrards Cross
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. The Future Homes and Buildings Standards, published in March 2026, apply from 24 March 2027 and keep the 2.2 W/m²K limit for rooflights.
See our building regulations guide for U-values, glazing limits and self-certification.
Guide prices for Gerrards Cross
Prices below are shown including and excluding VAT. In Gerrards Cross, as elsewhere, making good inside and access equipment are the main variables.
| 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 |
How the job runs
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Gerrards Cross address.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Neighbouring towns
Related work in Gerrards Cross
Common questions
What roof coverings do you work with?
Single-ply, EPDM, felt, GRP and liquid-applied systems — or we coordinate with your roofer.
Why is my rooflight cold around the edge?
Usually an uninsulated upstand. Insulating the kerb and lining the reveal fixes most cold spots.
Can an old upstand be reused?
If it is sound, square, insulated and the right size. Often it is cheaper to rebuild than adapt.
Is the survey in Gerrards Cross 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 Gerrards Cross?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
