What do loft conversion skylights in Isleworth involve?
Our loft conversion skylights service in Isleworth covers roof windows planned for loft rooms — light, headroom and escape. Every job starts with a survey of the opening, the roof covering and the room below, and a fixed written price.
Mansard and loft conversions are common across London, and roof windows are often set out alongside dormers on the rear slope. Think of loft conversion skylights for loft conversions and rooms in the roof.
Isleworth sits about 1 km from Hounslow and 3 km from Richmond, and we cover the whole TW7 postcode district and the roads in between.
Specification options
- Balcony roof windows on some ranges
- Blackout and thermal blinds
- Electric or solar opening
- Conservation styles
- Centre-pivot or top-hung
- Set out on the rafters before plastering
- Light planned around the room layout
Before you order: points to check
- Escape-window requirements apply to some loft rooms
- Front roof slopes can be restricted in conservation areas
Do you need permission in Isleworth?
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. 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.
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.
Loft conversion skylights prices in Isleworth
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Electric top-hung escape window | £1,675 – £2,395 | £1,395 – £1,995 |
| Standard centre-pivot window Typical | £1,195 – £1,675 | £995 – £1,395 |
| Small window into open rafters | £955 – £1,315 | £795 – £1,095 |
What happens next
- Tell us what you have. Send the TW7 postcode, a rough size and a couple of photos.
- 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.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Neighbouring towns
Related work in Isleworth
Loft conversion skylights in Isleworth: questions
Top-hung or centre-pivot in a loft?
Top-hung gives a clearer view and often suits escape use; centre-pivot is easier to clean and suits higher positions.
How many roof windows does a loft room need?
Enough to give good light — a common rule of thumb is glazing equal to roughly a tenth to a fifth of the floor area, adjusted for orientation and use. We advise at survey.
Do loft roof windows need to be escape windows?
Some loft rooms need an escape window, depending on the layout and the fire strategy for the conversion. Building control confirms the requirement.
Do I need to be at home for the survey in Isleworth?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
How do I book a survey in Isleworth?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
