Heat load surveys and system design in Coulsdon
For self-builds and extensions in Coulsdon, a standalone design pack can go straight to your builder. In London, heat soaks into brick and concrete during the day and comes back out at night, which is when it is hardest to sleep.
No two rooms in Coulsdon gain or lose heat in quite the same way, which is exactly why rooms are measured before sizing. Coulsdon sits around 12 miles from central London, inside our London area. Homes in CR5 are all within our coverage.
Prices in Coulsdon
Guide prices around Coulsdon run from £495 to £1,645 for a standalone design pack including VAT. Prices here sit above the national middle, reflecting London labour rates and parking and access costs. Larger homes, more zones and full drawing sets for a builder are what move a design pack towards the upper figure. As an example, the Design pack option (drawings and schedules for one home) would typically be £495–£1,045 here.
Home survey
Free with an installation quote.
Design pack
Drawings and schedules for one home.
Self-build pack
Whole-house design for a new build.
Planning and permissions
Since 29 May 2025, England's permitted development rules allow larger outdoor units (up to 1.5 m³) and no longer require a 1 m gap to the boundary, provided the MCS 020(a) noise check is met. Listed buildings and pitched-roof installs still need permission.
The survey
A survey in Coulsdon usually takes one to two hours. We measure the rooms, check the walls and the consumer unit, agree the outdoor unit position with you and photograph the pipe routes. We book surveys in Coulsdon at a time that suits you, including early evenings by arrangement, and send the written quote afterwards.
What is included
Every job in Coulsdon includes:
- Written proposal with options
- Noise check to the nearest neighbour
- Electrical load for your electrician
- Pipe and drain routes
- Room-by-room heat gain and heat loss
Nearby
Close to Coulsdon, our coverage also includes Purley (2 miles), Banstead (3 miles) and Sutton (3 miles). See all services in Coulsdon or heat load surveys and system design across London.