How we approach rooflight upstands & kerbs in Thamesmead
For Thamesmead homes and buildings we offer rooflight upstands & kerbs: insulated kerbs built and waterproofed to suit your rooflight. We measure first, specify to the opening and confirm any planning or building-control points before quoting.
Mansard and loft conversions are common across London, and roof windows are often set out alongside dormers on the rear slope. Rooflight upstands & kerbs suit new flat-roof openings and rooflight replacements.
Neighbouring towns include Barking (4 km) and Welling (5 km). We offer a survey date when we reply to your enquiry.
Options we can specify in Thamesmead
- Proprietary insulated kerbs
- Timber upstands with insulation
- Internal plaster-box linings
- Upstand repairs and rebuilds
- Raised upstands for deep green or ballasted roofs
- Fixings and falls agreed with the rooflight maker
- 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 and building rules for Thamesmead
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. A rooflight on a side-facing slope must be obscure-glazed, and fixed shut unless the opening part is more than 1.7 m above the floor.
Building Regulations Approved Document L sets a limiting U-value of 2.2 W/m²K for new or replacement rooflights in existing homes, measured in the horizontal plane; roof windows need 1.4 W/m²K or a Band B energy rating. 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.
Read the planning permission guide before you commit to a design.
Guide prices for Thamesmead
These are typical supply-and-fit ranges. For an address in Thamesmead, scaffold, a hoist for heavy glass, or a new structural opening can move the figure, which is why we survey first.
| 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 |
The process, step by step
- Tell us what you have. Send the SE28 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Thamesmead, measures and checks structure and access.
- Agree the quote. You approve the specification and price before anything is ordered.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Rooflight upstands & kerbs near Thamesmead
Other services in Thamesmead
Rooflight upstands & kerbs in Thamesmead: questions
Why is my rooflight cold around the edge?
Usually an uninsulated upstand. Insulating the kerb and lining the reveal fixes most cold spots.
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.
How do I book a survey in Thamesmead?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
Will I need planning permission in Thamesmead?
In England a rooflight on a house is usually permitted development under Class C if it projects no more than 150 mm beyond the roof slope and sits no higher than the ridge.
