Insulated conservatory roof panels in Harrow cost from £3,000 for a small lean-to, and most homes pay £3,000 to £7,500. On Harrow's weather, swapping a 12 m² polycarbonate roof for 75 mm panels keeps about 952 kWh of heat in each year, worth about £251 if you heat the room with an electric heater.
Harrow homes with polycarbonate or glass conservatory roofs lose heat for about 1,768 degree days a year, the local measure of how long the heating has to work.
Harrow's weather and your conservatory
Those figures are averages for 2021 to 2025 from Open-Meteo's historical weather data for Harrow. The hottest day in that time reached 37.6°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 Harrow conservatories sit empty in July as well as January.
What a new roof saves in Harrow
Heat loss through a roof is its U-value times its area times the degree days. For a typical 12 m² conservatory roof in Harrow:
| Roof | U-value | Heat lost a year | Cost with an electric heater | Cost on gas central heating |
|---|---|---|---|---|
| 16 mm polycarbonate | 2.3 | 1,171 kWh | £308 | £104 |
| 75 mm insulated panels | 0.43 | 219 kWh | £58 | £19 |
| Saving | 952 kWh | £251 a year | £84 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 Harrow's figure when you pick it from the list.
Roof panel prices in Harrow
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 Harrow, step by step
- Free survey. A surveyor covering Harrow 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 Harrow homeowners
How much do insulated conservatory roof panels cost in Harrow?
Most Harrow 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 Harrow?
With 1,768 heating degree days a year, a 12 m² roof of 16 mm polycarbonate lets about 1,171 kWh escape if the room is kept warm. The same roof in 75 mm insulated panels loses about 219 kWh.
Do I need planning permission in Harrow?
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 Harrow?
Surveys in and around Harrow 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.