Heat load surveys and system design in Purley
For self-builds and extensions in Purley, a standalone design pack can go straight to your builder. Many London homes are flats or tall terraces, where heat rises to the top floor and the bedrooms bear the brunt of a hot spell.
No two rooms in Purley gain or lose heat in quite the same way, which is exactly why rooms are measured before sizing. We cover Purley as part of London, roughly 11 miles from central London. Homes in CR8 are all within our coverage.
Prices in Purley
Guide prices around Purley run from £495 to £1,645 for a standalone design pack including VAT. London is one of the dearer parts of the UK for trades, which shows in the range. Larger homes, more zones and full drawing sets for a builder are what move a design pack towards the upper figure. On our London figures, the Design pack option (drawings and schedules for one home) is about £495–£1,045.
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 Purley 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. Surveys in Purley cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Included with heat load surveys and system design in Purley:
- Written proposal with options
- Room-by-room heat gain and heat loss
- Noise check to the nearest neighbour
- Equipment selection and outdoor unit sizing
- Pipe and drain routes
Nearby
Nearby, we also cover Coulsdon (2 miles), South Croydon (2 miles) and Carshalton (3 miles). See all services in Purley or heat load surveys and system design across London.