House extensions in Carmarthenshire

Carmarthenshire received 285 householder applications in the last 12 months - about 5 a week. Garage works and rear extensions are the most common. Of the 184 decided so far, 164 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

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Showing 50 of 101 applications
Yesterday Under Consultation PL/11361

The Limes, Queens Square, Llangadog, SA19 9BX

Widen existing gate entrance to form off road parking. Remove a section of garden wall, and rebuild the return using removed stone

Full planning permission Carmarthenshire
8 Sept 2026 Under Consultation PL/11360

2 Orchard Close, Burry Port, SA16 0DQ

Proposed side extension to dormer dwelling (Re-submission with bat survey)

Householder planning permission Carmarthenshire
8 Sept 2026 Under Consultation PL/11368

Brynderi, Llandeilo, SA19 7SU

First floor dormer extension to an existing bungalow with 2 no. Single storey extensions

Householder planning permission Carmarthenshire
7 Sept 2026 Under Consultation PL/11346

English Baptist Church, Brynmawr Lane, Ammanford

Single storey side extension

Full planning permission Carmarthenshire
7 Sept 2026 In Review PL/11336

Cuddfan, Dynevor Road, Garnant, Ammanford, SA18 1NP

Detached single storey garage for domestic use

Lawful development Carmarthenshire
7 Sept 2026 Under Consultation PL/11322

23 Heol Panteg, Burry Port, SA16 0YH

Proposed rear extension to dwelling house

Householder planning permission Carmarthenshire
7 Sept 2026 Under Consultation PL/11174

Trewen, Hen Heol Y Banc, Pontyberem, Llanelli, SA15 5BS

Proposed rear extension, garage rebuild and dormer windows to main property

Householder planning permission Carmarthenshire
4 Sept 2026 Under Consultation PL/11317

Stradey Patio Centre, Sandy Road, Llanelli, SA15 4DP

Retrospective erection of palisade fence and extension to builders merchants yard

Full planning permission Carmarthenshire
3 Sept 2026 Under Consultation PL/11315

The Limes, Queens Square, Llangadog, SA19 9BX

Replacement of uPVC gutter and section of downpipe to front elevation

Listed building consent (Alt/Ext) Carmarthenshire
2 Sept 2026 Under Consultation PL/11339

75 Heol Y Parc, Cefneithin, Llanelli, SA14 7DL

Proposed ground floor reconfiguration within the existing footprint, including removal of an existing conservatory, to rebuild and create a light-fill...

Householder planning permission Carmarthenshire
1 Sept 2026 Under Consultation PL/11304

33 Stepney Street, Llanelli, SA15 3UX

Physical alteration to building

Full planning permission Carmarthenshire
27 Aug 2026 In Review PL/11296

The Croft, Whitland, SA34 0LS

Certificate of Lawful Development - Proposed use of caravan as overspill accommodation to the main dwelling

Lawful development Carmarthenshire
26 Aug 2026 Under Consultation PL/11310

Cilfargen, Broad Oak, Carmarthen, SA32 8QP

Proposed alteration of approved holiday let to granny annexe ancillary to main dwelling

Full planning permission Carmarthenshire
26 Aug 2026 Decided PL/11284

Dandinas, Velindre, Llandysul, SA44 5YF

Existing building which has no roof at present, previous roof fell in to disrepair. Property was purchased in 1990, building was described as a Double...

Prior notification Carmarthenshire
25 Aug 2026 Under Consultation PL/11312

2 Hendre Road, Tycroes, Ammanford, SA18 3LA

Extension and reconfiguration of an existing dropped crossing and formation of off-street parking

Householder planning permission Carmarthenshire
24 Aug 2026 Under Consultation PL/11289

37 Aberlash Road, Ammanford, SA18 3NE

Proposed rear extension to dwelling house

Householder planning permission Carmarthenshire
24 Aug 2026 Under Consultation PL/11329

10 Maes Yr Helyg, Llandybie, Ammanford, SA18 2SX

Single Storey Rear Extension

Householder planning permission Carmarthenshire
24 Aug 2026 Under Consultation PL/11226

Coleg Sir Gar Pibwrlwyd Campus, Pibwrlwyd Lane, Pibwrlwyd, Carmarthen, SA31 2NH

Proposed siting of a steel container unit which will be internally fitted out to provide basic overnight sleeping accommodation for stable grooms asso...

Full planning permission Carmarthenshire
21 Aug 2026 Under Consultation PL/11262

7 Mansel Street, Carmarthen, SA31 1PX

Reinstatement following fire damage

Listed building consent (Alt/Ext) Carmarthenshire
21 Aug 2026 In Review PL/11251

Bleu Stone, Maesquarre Road, Ammanford, SA18 2PB

Siting of static caravan within residential curtilage as ancillary residential accommodation

Lawful development Carmarthenshire
20 Aug 2026 Under Consultation PL/11298

51 Kings Road, Llandybie, Ammanford, SA18 2TL

Rear two storey extension to dwelling house

Householder planning permission Carmarthenshire
19 Aug 2026 Under Consultation PL/11287

5 Lime Grove, Heol Y Meinciau, Pontyates, Llanelli, SA15 5SW

Proposed retaining wall adjacent to boundary line to enable the widening of the existing driveway / turning space

Householder planning permission Carmarthenshire
19 Aug 2026 Under Consultation PL/11303

Avondale, Milo, Ammanford, SA18 3NZ

Increase ridge height to form new habitable rooms at first floor level

Householder planning permission Carmarthenshire
18 Aug 2026 Under Consultation PL/11079

Land opposite 1 Brynderwen, Llanboidy, Whitland, SA34 0ED

Construction of classic vehicles storage shed

Full planning permission Carmarthenshire
17 Aug 2026 Under Consultation PL/11302

15 Eva Terrace, Ferryside, SA17 5TD

Proposed conversion of the existing garage and rear room to form a combined garage and office space, including the provision of a lobby and WC. Demoli...

Full planning permission Carmarthenshire
17 Aug 2026 Under Consultation PL/10943

18 Woodland Road, Ystradowen, Swansea, SA9 2YQ

Proposed single storey rear extension with flat roof and glazed lanterns

Householder planning permission Carmarthenshire
17 Aug 2026 In Review PL/11246

31 Carnhywel, Llanelli, SA14 9EE

Lawful Development Certificate - Proposed Use - rear dormer extension

Lawful development Carmarthenshire
14 Aug 2026 Under Consultation PL/11255

Teilo Vets, Beechwood Industrial Estate, Talley Road, Llandeilo, SA19 7HR

Installation of a converted container within the existing car park, providing additional veterinary accommodation

Full planning permission Carmarthenshire
12 Aug 2026 Under Consultation PL/11192

Woodlands, Newbridge Road, Laugharne, Carmarthen, SA33 4SJ

Erect a six foot feather board wooden fence

Householder planning permission Carmarthenshire
11 Aug 2026 In Review PL/11224

79 Heol Y Meinciau, Pontyates, Llanelli, SA15 5SE

Demolish existing garage and build a new garage

Householder planning permission Carmarthenshire
10 Aug 2026 Under Consultation PL/11140

Maes Yr Haf, Vicarage Close, Ferryside, SA17 5SU

Erect a 10 x 8 glass greenhouse in the side garden

Householder planning permission Carmarthenshire
10 Aug 2026 Under Consultation PL/11175

35 Heol Y Felin, Pontyberem, Llanelli, SA15 5EH

Formation of a new vehicular access and dropped kerb from Heol Y Felin to provide off-road parking and access to land associated with 35 Heol Y Felin,...

Full planning permission Carmarthenshire
10 Aug 2026 Under Consultation PL/11205

2-5 Blewgyd, St Clears, Carmarthen, SA33 4LX

Proposed 1 bay extension and lean-to plus changed to fenestration since construction

Full planning permission Carmarthenshire
7 Aug 2026 Under Consultation PL/11216

3 Tunnel Road, Llanelli, SA15 1LE

Demolition of existing single storey lean to kitchen, and replace with new 3 storey rear extension

Householder planning permission Carmarthenshire
6 Aug 2026 In Review PL/11176

10 Cae Linda, Trimsaran, Kidwelly, SA17 4AQ

Proposed dormer extension to the existing roof

Householder planning permission Carmarthenshire
5 Aug 2026 In Review PL/11235

22 Parcyrhun, Ammanford, SA18 3HE

Erection of a single storey side extention

Householder planning permission Carmarthenshire
4 Aug 2026 In Review PL/11238

3 Aelybryn, Pwll, Llanelli, SA15 4AH

Demolish existing rear conservatory and construct new rear ground floor extension

Householder planning permission Carmarthenshire
4 Aug 2026 In Review PL/11223

22 Station Road, Kidwelly, SA17 4UH

Proposed rear single storey kitchen extension

Householder planning permission Carmarthenshire
3 Aug 2026 In Review PL/11221

5 Capel Evan Road, Carmarthen, SA31 1HN

A two vehicle car port placed on hard standing 2.5 metres from my boundary tree line. The car port is not a permanent structure. It will consist of a ...

Householder planning permission Carmarthenshire
31 Jul 2026 Approved PL/11220

34 Heol Y Neuadd, Tumble, Llanelli, SA14 6HR

Temporary siting of a static caravan within the residential curtilage of the dwelling, together with temporary electricity, water and foul drainage co...

Lawful development Carmarthenshire
30 Jul 2026 In Review PL/11211

Cwmtarian Farm, Ammanford, SA18 2UH

Install PVCu conservatory to the side of the property

Householder planning permission Carmarthenshire
30 Jul 2026 In Review PL/11190

2B Great Western Terrace, Llanelli, SA15 2ND

Single Storey side extension comprising a bathroom/wetroom

Householder planning permission Carmarthenshire
29 Jul 2026 In Review PL/11161

Fernhill Cottage, Newbridge Road, Laugharne, Carmarthen, SA33 4SJ

Replacement of two first floor windows - the smaller ones to either side of the building

Listed building consent (Alt/Ext) Carmarthenshire
28 Jul 2026 Approved PL/11204

4 Bryn Bach Road, Upper Brynamman, Ammanford, SA18 1BH

Lawful Development Certificate application for the proposed provision of a single unit mobile home (not operational development) within the garden of ...

Lawful development Carmarthenshire
27 Jul 2026 In Review PL/11197

Bryncadno, Waunfarlais, Llandybie, Ammanford, SA18 3NG

Proposed single storey rear extension including internal layout amendments, fenestration alterations to the front elevation, demolition of the existin...

Householder planning permission Carmarthenshire
23 Jul 2026 In Review PL/11166

3-5 Tycroes Road, Tycroes, Ammanford, SA18 3QF

The conversion of a ground floor retail unit (flower shop) and 2 no. flats to 2 no. houses, together with a rear extension

Full planning permission Carmarthenshire
23 Jul 2026 In Review PL/11165

35 Golwg Y Capel, Tycroes, Ammanford, SA18 3NW

Single Storey Side Extension for the use of a disabled person, comprising bedroom and wet room

Householder planning permission Carmarthenshire
23 Jul 2026 Approved PL/11143

Annexe, Minyrafon, Meidrim Road, St Clears, Carmarthen, SA33 4DR

Proposed extension / re-configuration of the existing annexe to provide disabled shower room for the applicant

Householder planning permission Carmarthenshire
21 Jul 2026 In Review PL/11145

67 Tir Y Dail Lane, Ammanford, SA18 3AN

Proposed demolishment of existing conservatory and part rear two storey dwelling with new 2 storey rear extension to provide new kitchen / utility roo...

Householder planning permission Carmarthenshire
20 Jul 2026 Under Consultation PL/11157

Coedcae Comprehensive School, Trostre Road, Llanelli, SA15 1LJ

Construct a DDA compliant concrete ramp in order to provide level access to the upper playing fields and tennis court to the wheelchair bound pupils a...

Full planning permission Carmarthenshire
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Frequently asked questions

When do you need planning permission for a house extension?
Single-storey rear extensions up to 4m (detached) or 3m (semi-detached / terraced) are usually permitted development. Two-storey extensions, anything in a conservation area, or larger projects almost always need a planning application.
What's the difference between planning permission and permitted development?
Permitted development rights let you build certain things without applying for planning permission, subject to specified limits. Anything outside those limits, whether taller, larger or in a protected area, needs full planning permission.
How long does a householder application take?
The statutory target is 8 weeks from validation. Most simple householder extensions are decided within that window; complex or contested cases, especially those drawing a lot of comments, can take longer.
Can I get email alerts for new extensions applications in Carmarthenshire?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Carmarthenshire. You can also narrow the alert to a postcode, street, or drawn area.

We check Carmarthenshire's planning portal daily. New extensions applications appear here within a day of being published.