Heat load surveys and system design in Sevenoaks
No two rooms in Sevenoaks gain or lose heat in quite the same way, which is exactly why rooms are measured before sizing. In the South East, loft rooms and glazed extensions can climb well above the outside temperature on a sunny afternoon.
Every Sevenoaks quote starts with a room-by-room survey rather than a guess from floor area. Sevenoaks lies roughly 14 miles from Maidstone, and we cover it as part of Kent. That includes the TN13 postcode district.
Prices in Sevenoaks
Heat load surveys and system design in Sevenoaks typically come in at £495–£1,495 for a standalone design pack including VAT, based on South East England rates. Prices here sit above the national middle, reflecting South East England 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–£945 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 Sevenoaks 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. The free survey is where the real price is set: room measurements, pipe and drain routes, electrical checks and the outdoor unit position, all written into your quote.
What is included
Here is what is included on every job in Sevenoaks:
- Written proposal with options
- Electrical load for your electrician
- Noise check to the nearest neighbour
- Pipe and drain routes
- Room-by-room heat gain and heat loss
Nearby
Nearby, we also cover Tonbridge (6 miles), Swanley (9 miles) and Tunbridge Wells (10 miles). See all services in Sevenoaks or heat load surveys and system design across Kent.