Backland Development
0800 088 6248Free to call Free plot appraisal

Build a home for family in your garden in Carmarthen

Bringing an elderly parent to live beside you in Carmarthen often feels like the obvious answer, until you look at what the house can offer. A spare room up a flight of stairs rarely suits someone whose mobility is failing. A purpose-built single-storey home in the garden can.

We offer design and build of garden homes for family across Dyfed, with no steps to climb, a bedroom at ground level and a walk-in shower built in from day one. Planning goes through Carmarthenshire County Council, and we prepare and manage the application for you. Start with a free plot appraisal and we’ll tell you honestly whether your garden looks suitable.

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Single-storey garden home with wide glazed doors and a covered porch at the back of a family garden
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

How it plays out in Carmarthen

Daylight matters twice over when the new home is for a relative who spends much of the day indoors. At noon on 21 March the sun in Carmarthen is about 38° above the horizon, so a two-storey eaves line around 5 m high casts a shadow of roughly 6.4 m. A single-storey annexe with eaves at half that height casts one about half as long, which is one reason low buildings often sit more easily in a garden. By late December the midday sun climbs only about 15°, so we test winter light on both homes, and on next-door gardens, before the layout is fixed.

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

Here’s what happens next for a family home in Carmarthen. You tell us about your plot and who the home is for, and we carry out a free desktop appraisal of access, space and the planning context. If it looks viable we visit, then set out the annexe and separate-home options. With your go-ahead we survey, design and give you a written quote, then prepare the application for Carmarthenshire County Council.

  1. Free plot appraisal

    We look at your plot, access and the planning picture from the desk, talk through who will live in the new home, and visit if it looks viable. There’s no cost and no obligation.

  2. Annexe or separate home

    We set out both routes for your plot, covering what each means for planning, ownership, council tax, CIL and VAT, so you can decide with your family and advisers before design starts.

  3. Planning and approvals

    We prepare and submit the planning application and manage it with the council, which makes the decision. Before work starts, approval under the Building Regulations as they apply in Wales is in place and any CIL exemption has been claimed.

  4. Build and handover

    We build while you carry on living next door, with access, deliveries and working hours agreed up front. At handover you get the completion certificate and the paperwork you’ll need for council tax, lenders and any VAT claim.

Worth checking early

  • VAT savings available on a separate dwelling often don’t apply to an annexe; take advice from a tax adviser before choosing.
  • An annexe tied by planning condition usually can’t be sold or let separately, which limits flexibility later.
  • Family plans change: agree ownership, costs and what happens if circumstances change in writing, with a solicitor.

Your questions, answered for Carmarthen

Do I need planning permission for a granny annexe in Carmarthen?

Yes, almost always for a detached annexe with its own kitchen, bathroom and bedroom. Carmarthenshire County Council will treat it as accommodation linked to your home and will usually add a condition so it can’t be let or sold separately. A garden building used only as a home office or gym is a different matter, but sleeping and cooking take it beyond those allowances.

How much garden do I need for a family home in Carmarthen?

There’s no fixed figure. A single-storey annexe close to the house can work on a smaller plot than a separate dwelling, which needs its own garden, parking and access. What matters is whether Carmarthenshire County Council can be satisfied on privacy, daylight and the space left for both homes. The free appraisal gives you a first view based on your plot’s actual shape and access.

Can I reclaim VAT on a family annexe in Carmarthen?

Often not. HMRC’s guidance gives an annexe that can’t be used or sold separately from the main house as an example of work that can’t be zero-rated, and the DIY housebuilders refund scheme asks the same question. A separate dwelling is usually treated differently. Take advice from a tax adviser before you settle the planning route, because the wording of the permission matters.

Is CIL payable on a family home in Carmarthen?

Only if Carmarthenshire County Council has adopted the Community Infrastructure Levy, which its website will confirm, and we check it for you during the appraisal. Where it applies, self-build and residential annexe exemptions exist, but both must be claimed before work starts and can be withdrawn if the home is sold or let within three years of completion.

Other options in Carmarthen

Family home 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.

Get my free appraisal 0800 088 6248