Heat load surveys and system design in Llanelli
Every Llanelli quote starts with a room-by-room survey rather than a guess from floor area. South Wales summers can be warm and humid, and winters damp, so a reversible system earns its keep all year.
For self-builds and extensions in Llanelli, a standalone design pack can go straight to your builder. Llanelli lies roughly 13 miles from Carmarthen, and we cover it as part of Dyfed. Coverage includes SA15.
Prices in Llanelli
Heat load surveys and system design in Llanelli typically come in at £365–£1,145 for a standalone design pack including VAT, based on South and Mid Wales rates. It is a touch below the UK middle, as trade rates in South and Mid Wales tend to be. Larger homes, more zones and full drawing sets for a builder are what move a design pack towards the upper figure. 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
Wales removed its old 3 m boundary rule on 1 June 2026, so most houses in Llanelli can now have an outdoor unit under permitted development if it meets the MCS 020a noise condition. Listed buildings still need consent, and conservation areas have extra restrictions.
The survey
Surveys in Llanelli 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
Every job in Llanelli includes:
- Pipe and drain routes
- Room-by-room heat gain and heat loss
- Written proposal with options
- Noise check to the nearest neighbour
- Equipment selection and outdoor unit sizing
Nearby
If you are just outside Llanelli, we also work in Gorseinon (5 miles), Swansea (10 miles) and Ammanford (11 miles). See all services in Llanelli or heat load surveys and system design across Dyfed.