Rooflight upstands & kerbs in Brentwood: what is involved?
Thinking about rooflight upstands & kerbs in Brentwood? 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.
Coastal towns in the East of England see salty air, so we specify frame finishes and fixings with exposure in mind. Rooflight upstands & kerbs suit roofs where the old kerb is low, cold or leaking.
Brentwood is around 30 km from Southend-on-Sea, and we survey and fit throughout that part of Essex, including the CM14 district.
Options we can specify in Brentwood
- Internal plaster-box linings
- Proprietary insulated kerbs
- Upstand repairs and rebuilds
- Timber upstands with insulation
- Raised upstands for deep green or ballasted roofs
- Insulated to avoid a cold bridge
- Matched to your roof covering
Before you order: points to check
- 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 Brentwood
English householder permitted development (Class C) normally covers rooflights that stand no more than 0.15 m proud of the roof plane and stay below the highest part of the roof. 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.
Our planning guide covers each nation in more detail.
Guide prices for Brentwood
Guide prices for rooflight upstands & kerbs in Brentwood 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 |
From enquiry to finished job
- 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.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Neighbouring towns
Related work in Brentwood
Common questions
Does every rooflight need an upstand?
Flat and dome rooflights do. Pitched roof windows use flashing kits instead.
Can an old upstand be reused?
If it is sound, square, insulated and the right size. Often it is cheaper to rebuild than adapt.
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.
Can you work alongside my builder in Brentwood?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
Do I need to be at home for the survey in Brentwood?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
