Heat load surveys and system design in Carmarthen
Humid summer spells in South Wales make dehumidifying and cooling equally welcome. Every Carmarthen quote starts with a room-by-room survey rather than a guess from floor area.
For self-builds and extensions in Carmarthen, a standalone design pack can go straight to your builder. As well as Carmarthen itself, our Dyfed coverage takes in Llanelli, Ammanford and the towns around them. We cover SA31 and the streets around them.
Prices in Carmarthen
Heat load surveys and system design in Carmarthen typically come in at £365–£1,145 for a standalone design pack including VAT, based on South and Mid Wales rates. Labour rates in South and Mid Wales keep this slightly under the national middle. A standalone design pack is priced on the size of the home, the number of rooms and how much drawing work your builder or architect needs. Typical Design pack work (drawings and schedules for one home) lands around £365–£745 in this area.
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
Surveys in Carmarthen cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare. 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 Carmarthen:
- Electrical load for your electrician
- Written proposal with options
- Noise check to the nearest neighbour
- Room-by-room heat gain and heat loss
- Pipe and drain routes
Nearby
Close to Carmarthen, our coverage also includes Llanelli (13 miles), Ammanford (14 miles) and Gorseinon (17 miles). See all services in Carmarthen or heat load surveys and system design across Dyfed.