Skylight installation in Northampton: what is involved?
Thinking about skylight installation in Northampton? The short answer: survey, supply and fit — new openings, extensions and fit-only work. The longer answer depends on your roof, which is why we survey before we price.
Many Midlands semis have had a single-storey rear extension added, and a larger flat rooflight or lantern is often the change that makes it feel finished. Typical uses for skylight installation include new extensions, new openings and fit-only jobs.
Northampton is the main town we list in Northamptonshire; we also cover nearby Wellingborough and Towcester.
What you can choose
- Upstands and flashings
- New openings with joist trimming
- Supply and fit
- Electrics coordination
- Internal plaster reveal
- Making good inside included
- Fit-only for units you have bought
Before you order: points to check
- Building Regulations approval (a building warrant in Scotland) may be needed
- Structural changes may need an engineer's check
Consents for skylight installation in Northampton
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.
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.
Read the planning permission guide before you commit to a design.
What does skylight installation cost in Northampton?
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| New opening in an existing roof, supply and fit | £2,395 – £5,395 | £1,995 – £4,495 |
| Supply and fit into a new extension Typical | £1,435 – £3,595 | £1,195 – £2,995 |
| Fit only, customer-supplied unit | £595 – £1,195 | £495 – £995 |
What happens next
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Northampton address.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Agree the quote. You approve the specification and price before anything is ordered.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Nearby towns
Related work in Northampton
Skylight installation in Northampton: questions
Do I need a structural engineer?
For new openings that cut joists or rafters, a structural check is sensible and building control may ask for calculations.
Do you work with builders?
Yes — on new extensions we fit to the builder's programme once the upstand or roof is ready.
How long does installation take?
Fitting into a prepared upstand takes about a day. A new opening in an existing roof, including making good, often takes two to three days.
Do I need to be at home for the survey in Northampton?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
Is the survey in Northampton free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
