Heat load surveys and system design in Haverfordwest
Humid summer spells in South Wales make dehumidifying and cooling equally welcome. For self-builds and extensions in Haverfordwest, a standalone design pack can go straight to your builder.
Every Haverfordwest quote starts with a room-by-room survey rather than a guess from floor area. Haverfordwest is about 29 miles from Carmarthen and falls within our Dyfed coverage. Coverage includes SA61.
Prices in Haverfordwest
In South and Mid Wales, our guide range for heat load surveys and system design is £365–£1,145 for a standalone design pack, including VAT. It is a touch below the UK middle, as trade rates in South and Mid Wales tend to be. The design pack price depends mainly on the number of rooms and whether full drawings and equipment schedules are needed. On our South and Mid Wales figures, the Design pack option (drawings and schedules for one home) is about £365–£745.
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 1 June 2026, Welsh permitted development rules for outdoor units closely match England's: up to 1.5 m³, two units on a detached home, one on other homes, and MCS 020a noise compliance. Listed buildings need consent, and conservation areas have extra restrictions on units facing a road.
The survey
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. Surveys in Haverfordwest cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
What a job in Haverfordwest covers:
- Pipe and drain routes
- Noise check to the nearest neighbour
- Written proposal with options
- Room-by-room heat gain and heat loss
- Electrical load for your electrician
Nearby
Close to Haverfordwest, our coverage also includes Milford Haven (7 miles), Pembroke Dock (8 miles) and Tenby (14 miles). See all services in Haverfordwest or heat load surveys and system design across Dyfed.