Insulated conservatory roof panels in Barnet cost from £3,000 for a small lean-to, and most homes pay £3,000 to £7,500. On Barnet's weather, swapping a 12 m² polycarbonate roof for 75 mm panels keeps about 968 kWh of heat in each year, worth about £255 if you heat the room with an electric heater.
Over the last five years Barnet averaged 1,797 heating degree days a year, and that is the number that decides how much warmth leaks out of a thin conservatory roof.
Barnet's weather and your conservatory
Those figures are averages for 2021 to 2025 from Open-Meteo's historical weather data for Barnet. The hottest day in that time reached 38°C on 19 July 2022. Under a polycarbonate or glass roof in direct sun, the room itself gets far hotter than the air outside, which is why so many Barnet conservatories sit empty in July as well as January.
What a new roof saves in Barnet
Heat loss through a roof is its U-value times its area times the degree days. For a typical 12 m² conservatory roof in Barnet:
| Roof | U-value | Heat lost a year | Cost with an electric heater | Cost on gas central heating |
|---|---|---|---|---|
| 16 mm polycarbonate | 2.3 | 1,190 kWh | £313 | £105 |
| 75 mm insulated panels | 0.43 | 223 kWh | £59 | £20 |
| Saving | 968 kWh | £255 a year | £86 a year |
Prices use the Ofgem price cap for 1 October to 31 December 2026. If you never heat the conservatory you will not see a bill saving, but the room will stay much closer to the temperature of the rest of the house. Try your own size in the cost and heat loss calculator, which uses Barnet's figure when you pick it from the list.
Roof panel prices in Barnet
Our prices are the same across London. They include removing the old roof, made to measure panels in your colour, fitting, the building control application and a 10 year insurance backed guarantee.
| Style | Small (0 to 12 m²) | Medium (12 to 25 m²) | Large (25 m² and over) |
|---|---|---|---|
| Lean-to | £3,000 to £3,550 | £3,950 to £4,700 | £5,450 to £6,450 |
| Edwardian | £3,200 to £3,800 | £4,200 to £4,950 | £5,800 to £6,850 |
| Victorian | £3,300 to £3,900 | £4,350 to £5,150 | £6,000 to £7,100 |
| Gable end | £3,350 to £4,000 | £4,450 to £5,250 | £6,100 to £7,250 |
| P-Shape | £3,500 to £4,150 | £4,600 to £5,450 | £6,300 to £7,500 |
See what changes the price in the full price guide, or read how the insulated panels are made.
Fitting a roof in Barnet, step by step
- Free survey. A surveyor covering Barnet measures the roof, checks the frame, glazing bars and dwarf walls, and talks through colours and roof lights.
- Fixed written price. You get the price in writing, with no deposit taken before the survey.
- Building control. We apply to building control for you, because a solid insulated roof normally ends the conservatory's exemption. What that involves.
- Fitting day. The old roof comes off and the new panels go on, usually in one or two days, with the room covered and cleaned as we go.
- Sign off. Building control inspects and issues the completion certificate, and your guarantee paperwork follows.
Questions from Barnet homeowners
How much do insulated conservatory roof panels cost in Barnet?
Most Barnet homes pay £3,000 to £7,500. A medium Edwardian of about 17 m² is usually £4,200 to £4,950, fitted, with the old roof taken away, building control and the 10 year guarantee included. The survey gives you a fixed price.
How much heat does a conservatory roof lose in Barnet?
With 1,797 heating degree days a year, a 12 m² roof of 16 mm polycarbonate lets about 1,190 kWh escape if the room is kept warm. The same roof in 75 mm insulated panels loses about 223 kWh.
Do I need planning permission in Barnet?
Usually not, because the footprint and height stay the same. If your home is listed, in a conservation area or has had its permitted development rights removed, check with the local council first. Building control approval is normally needed and we apply for it.
How soon can you fit a roof in Barnet?
Surveys in and around Barnet are normally booked within a week, and most roofs are fitted 3 to 5 weeks after the survey. A small roof takes a day, larger ones two to three.