Backland Development
0800 088 6248Free to call Free plot appraisal

Build a new home in your garden in Carmarthen

Building a second home behind your own in Carmarthen is a construction project with one unusual feature: you live beside the site from the first spade to the last coat of paint. That shapes how we plan it, from the fence that separates your garden on day one to where deliveries park.

The route covers everything between an idea and a finished house. We survey and design, prepare and submit the planning application, arrange Building Regulations approval and the structural warranty, organise new water, drainage and electricity connections, and then build. You keep ownership of the land throughout.

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Timber-frame house under construction with scaffolding at the bottom of a back garden, seen from the patio
Planning authority
Carmarthenshire County Council
Postcodes
SA31
Noon sun, 21 March
About 38°
Shadow from a 5 m eaves line
About 6.4 m
Planning plan
LDP
County
Dyfed

What the council will look at in Carmarthen

We cover gardens in Carmarthen and nearby places such as Burry Port, Llanelli and Ammanford, with the same process wherever you are: a free desktop appraisal, a visit if the plot looks viable, then survey and design.

Some of those places may fall under a different council from Carmarthenshire County Council, and each local planning authority has its own design guidance, validation list and pre-application service. We confirm which authority covers your address at the start, so the application is prepared for the right requirements first time and avoids delays at validation.

Section showing noon sun and shadows in Carmarthen: about 38 degrees on 21 March and 15 degrees on 21 December21 m21 Mar, noon: sun 38°, shadow 6.4 m21 Dec, noon: sun 15°, shadow 19.1 mExistingNew home
This section is worked out for the latitude of Carmarthen: around 38° of sun at midday in late March and about 15° at midwinter. It shows why the gap between your house and a new home behind it is about light as well as privacy. Garden assumed to face north.

From first call to decision

If your Carmarthen plot already has planning permission, we begin by checking the approved drawings and conditions against the site. Some permissions need detailed design, discharge of conditions or a minor amendment before they can be built. We then prepare the technical drawings, arrange Building Regulations approval and the warranty, apply for utility connections and give you a written quote to build.

  1. Free plot appraisal

    We check the title plan, access, constraints and planning policy from our desk, talk the plot through with you, and visit if it looks viable. There’s no cost and no obligation.

  2. Survey and design

    A measured survey records levels, boundaries, trees and neighbouring windows. We then design a layout and house that suit the plot, the street and your budget, and decide whether pre-application advice is worth seeking.

  3. Written quote and build

    Once design and survey are complete you get a written quote. The build runs in stages — access and groundworks, foundations, frame and roof, fit-out and external works — with inspections at each key point.

  4. Handover

    You receive the completion certificate, warranty documents, Energy Performance Certificate, manuals and utility details, so the new home is ready to move into, let or put on the market.

Worth checking early

  • Planning can be refused, and money spent on surveys, design and the application isn’t recovered if it is — which is why we start with an appraisal.
  • You fund the build and carry the cost risk; ground conditions, sewer diversions or supply upgrades found later can move the price.
  • Building and selling a new home can change your tax position compared with selling only your house; take advice from a tax adviser first.

Carmarthen: questions to ask

Can the new home in my Carmarthen garden connect to the main sewer?

Usually, yes, but the route and depth decide how easily. The new home needs its own foul connection, agreed with the water company, and gravity drainage is simplest where the sewer sits lower than the new floor. If it doesn’t, a pumped connection may be needed. Where a public sewer runs under your garden, a build-over agreement or diversion may also be required.

Will I pay Community Infrastructure Levy on a new home in Carmarthen?

Only if Carmarthenshire County Council has adopted a Community Infrastructure Levy charging schedule; not every council has. Where it applies, it can be charged on a new home of any size. A self-build exemption exists for people building a home to live in, but it must be claimed before work starts, so we check the position at design stage.

How close can a new house be to my own in Carmarthen?

There’s no single national distance. Many councils use separation guides of around 21 metres between facing back windows and around 12 to 15 metres between a back window and a blank side wall, but the guidance used by Carmarthenshire County Council decides. Window positions, ground levels, roof shape and screening all affect what is acceptable, which is why we survey before we design.

Can I build a house in my garden in Carmarthen and keep the land?

Yes. On our design and build route you remain the owner while we design the home, apply to Carmarthenshire County Council for planning, deal with Building Regulations and build it. The finished house can be sold, let or kept for family. Whether your plot can take a house depends on access, space, neighbours and local policy, and the decision rests with the council.

Other options in Carmarthen

Build in your garden near Carmarthen

Find out what your garden could become

Free garden plot appraisal. No cost, no obligation, and a straight answer if it won’t work.

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