What Brentwood weather does to a conservatory
Each square below is the average room temperature for one hour of one month, worked out from every hour of 2024 and 2025 at Brentwood's coordinates. Switch between roofs to see the afternoon block of amber and plum shrink. Outside, August averaged 18.4°C and the warmest hour reached 33.2°C; inside a shut polycarbonate room the model's hottest hour was 48°C.
A year inside a Brentwood conservatory
Average room temperature, every month and hour of 2024 and 2025
- 1,447
- hours over 25°C
- 48°C
- hottest hour
- 33°C
- July, 3pm
- 1,598
- hours over 25°C
- 51°C
- hottest hour
- 35°C
- July, 3pm
- 411
- hours over 25°C
- 36°C
- hottest hour
- 25°C
- July, 3pm
Blue: heater weatherPale: comfortableAmber to plum: too warm
The hours you get back
Count only the hours people are awake, 8am to 10pm, and sort them by how the room feels. Cold hours can be fixed with a heater. Too-warm hours mostly cannot, short of opening everything and hoping. That is why the panel roof adds about 1,036 usable hours a year in Brentwood: 3,667 becomes 4,703.
Hours above 30°C drop from 670 under polycarbonate (and 829 under glass) to 47 with panels.
- Polycarbonate roof1,447 h too warm
- Glass roof1,598 h too warm
- Panel roof411 h too warm
Too cold (under 12°C)Chilly (12 to 17°C)Comfortable (17 to 25°C)Warm (25 to 28°C)Too hot (over 28°C)
When the heat peaks in Brentwood
Under polycarbonate the overheating peaks in June, when 51% of waking hours pass 28°C. With the panel roof the same month sits at 11%. Look at April and September as well: low sun through glass walls still warms the room, but not through the roof any more.
Polycarbonate roofInsulated panel roof
Winter in Brentwood
January is Brentwood's coldest month, averaging 4.1°C, with a lowest hour of -4.4°C over the two years. Holding the room at 19°C through waking hours takes about 1,521 kWh a year under polycarbonate (£400 on electric heaters at the 26.32p price cap) and 1,310 kWh (£345) under panels.
That saving is real but modest, because the glass walls still lose heat. The bigger winter change is the heater: on a freezing evening a 1.1 kW heater keeps up under panels where polycarbonate needs 1.7 kW.
Prices for Brentwood conservatory roofs
We price Brentwood roofs on size and shape only, so the guide below holds anywhere in East Anglia and Hertfordshire. The survey is free and the written price is fixed. See the price page for every shape, or get a guide price for your roof in about a minute.
| Shape | Small (up to 12 m²) | Medium (12 to 25 m²) | Large (over 25 m²) |
|---|---|---|---|
| Lean-to | from £3,000 | from £4,000 | from £5,000 |
| Edwardian | from £3,150 | from £4,200 | from £5,250 |
| Victorian | from £3,300 | from £4,400 | from £5,500 |
Fitting day
Most roofs here take one day, larger or more complicated ones two. The old sheets come off in the morning, the frame is checked, and the panels, ridge or hub and trims go on before the light goes. The fitting day walks through it hour by hour.
Towns near Brentwood
Compare your neighbours, or see all of East Anglia and Hertfordshire and the full overheating league table.