House extensions in Carmarthenshire

Carmarthenshire received 356 householder applications in the last 12 months - about 7 a week. Garage works and rear extensions are the most common. Of the 248 decided so far, 216 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 109 applications
21 Oct 2026 Under Consultation PL/11561

3 Penygaer Road, Llanelli, SA14 8RU

Two storey side and rear extension, with widening of entrance gates to drive

Householder planning permission Carmarthenshire
21 Oct 2026 Under Consultation PL/11430

Bron Y Felin, Cynghordy, Llandovery, SA20 0LH

Change of use of land to domestic curtilage associated with Bron Y Felin and the siting of three ancillary shepherd huts for use as a home office, anc...

Full planning permission Carmarthenshire
19 Oct 2026 Under Consultation PL/11553

Capel Peniel, Heol Y Foel, Foelgastell, Llanelli

Change of use from chapel to residential accommodation with addition of side extension

Full planning permission Carmarthenshire
16 Oct 2026 Under Consultation PL/11407

Old School Cottage, Llangathen, Carmarthen, SA32 8QE

Conversion of office outbuilding to provide ancillary accommodation for use in conjunction with the main dwelling house

Householder planning permission Carmarthenshire
15 Oct 2026 Under Consultation PL/11547

Penrhiwlas, Cwmdu, Llandeilo

Alterations and single storey extension to rear

Householder planning permission Carmarthenshire
14 Oct 2026 Under Consultation PL/11545

5 Bryndulais, Llanllwni, Pencader, SA39 9DT

Domestic garage to replace dilapidated building

Householder planning permission Carmarthenshire
13 Oct 2026 Under Consultation PL/11546

4 Bro Gelli, Capel Iwan, Newcastle Emlyn, SA38 9NH

Proposed Single storey rear extension to provide bedroom and wetroom

Householder planning permission Carmarthenshire
13 Oct 2026 Under Consultation PL/11453

Golygfa Hyfryd, Hebron, Whitland, SA34 0YR

Single storey garage/workshop for own use

Householder planning permission Carmarthenshire
13 Oct 2026 Under Consultation PL/11502

10 Cae Linda, Trimsaran, Kidwelly, SA17 4AQ

Proposed dormer extension to the existing roof

Householder planning permission Carmarthenshire
12 Oct 2026 Under Consultation PL/11535

Ty Amman Support Centre, High Street, Ammanford, SA18 2NA

Proposed removal of existing retaining wall and construction of a replacement retaining wall along the site frontage at Ty Aman, including associated ...

Full planning permission Carmarthenshire
12 Oct 2026 In Review PL/11537

Ty Penygau, Ferryside, SA17 5UG

Construction of ancillary outbuilding and associated link between the outbuilding and the dwellinghouse

Lawful development Carmarthenshire
12 Oct 2026 In Review PL/11515

11 Gerddi Gwenllian, Mynyddygarreg, Kidwelly, SA17 4BA

Proposed Greenhouse

Lawful development Carmarthenshire
12 Oct 2026 Under Consultation PL/11524

Cwmlogin House, Maesybont, Llanelli, SA14 7HB

Retrospective retention of an open shelter and shepherd’s hut ancillary to an established animal rescue facility

Full planning permission Carmarthenshire
12 Oct 2026 Under Consultation PL/11509

Capel Y Groes House, Cilycwm, Llandovery, SA20 0SS

Formation of an opening in existing boundary wall and installation of a connecting path in the front garden

Listed building consent (Alt/Ext) Carmarthenshire
9 Oct 2026 Under Consultation PL/11527

Llanelli And District Credit Union, 6-8 Bridge Street, Llanelli, SA15 3UF

Replacement of existing windows

Full planning permission Carmarthenshire
9 Oct 2026 Under Consultation PL/11403

Tynewydd, Pentrecagal, Newcastle Emlyn, SA38 9HT

Garage conversion, new porch, demolition of existing outbuilding and erection of detached garage

Householder planning permission Carmarthenshire
9 Oct 2026 Under Consultation PL/11526

Burns Pet Nutrition Ltd, Kidwelly, SA17 5EJ

Change of use from an office building to 7 flats, with side and rear extensions

Full planning permission Carmarthenshire
8 Oct 2026 Under Consultation PL/11308

Nythfa, Carmel, Llanelli, SA14 7UA

Extension at first floor level (previously approved in 2004 under E/06270)

Householder planning permission Carmarthenshire
8 Oct 2026 In Review PL/11504

1 Johns Villas, Llandeilo, SA19 6DP

The proposed rear extensions are considered to fall within permitted development rights for the existing dwellinghouse, with no change of use proposed

Lawful development Carmarthenshire
6 Oct 2026 Under Consultation PL/11506

14 New Street, Kidwelly, SA17 5DQ

Rear ground and first floor extensions, with the formation of a vehicular access through part of an existing boundary wall and creation of a hardstand...

Householder planning permission Carmarthenshire
6 Oct 2026 Under Consultation PL/11514

135 Pwll Road, Pwll, Llanelli, SA15 4AP

Erect a storm porch to the front elevation

Householder planning permission Carmarthenshire
6 Oct 2026 Under Consultation PL/11496

38 Llandeilo Road, Cross Hands, Llanelli, SA14 6RD

Proposed Front Window Alteration

Full planning permission Carmarthenshire
6 Oct 2026 Under Consultation PL/11481

147 Heol Cae Pownd, Cefneithin, Llanelli, SA14 7BX

Proposed conversion of integral garage to habitable room

Householder planning permission Carmarthenshire
6 Oct 2026 Under Consultation PL/11498

10 Hewlett Road, Pontyberem, Llanelli, SA15 5LU

Double storey side and rear extension

Householder planning permission Carmarthenshire
5 Oct 2026 Under Consultation PL/11398

85 Heol Y Banc, Bancffosfelen, Llanelli, SA15 5DL

Proposed First floor rear extension

Householder planning permission Carmarthenshire
5 Oct 2026 Closed PL/11382

1 Waun Deri, Pembrey, Burry Port, SA16 0LF

Propose to install a annex in the rear side garden of our property for my mother to use in as she now requires additional space and care needs

Lawful development Carmarthenshire
1 Oct 2026 Under Consultation PL/11487

Glyncerrig, Furnace, Llanelli, SA15 4HE

Single storey front and side extensions with associated alterations

Householder planning permission Carmarthenshire
30 Sept 2026 Under Consultation PL/11474

78 Pentre Nicklaus Village, Llanelli, SA15 2DE

Conversion of garage to form studio space with attic conversion to main pitched roof and associated works

Householder planning permission Carmarthenshire
30 Sept 2026 In Review PL/11471

Hyfrydle, 7 Black Lion Road, Gorslas, Llanelli, SA14 6RS

Proposed single storey extension to dwelling

Householder planning permission Carmarthenshire
29 Sept 2026 In Review PL/11468

Neuadd Deg, Manordeilo, Llandeilo, SA19 7BL

Proposed extension and renovation of dwelling

Householder planning permission Carmarthenshire
28 Sept 2026 Under Consultation PL/11464

Tegfryn, Newcastle Emlyn, SA38 9RD

Proposed Extensions and Alterations to existing dwelling

Householder planning permission Carmarthenshire
28 Sept 2026 In Review PL/11462

Cliftonville, Pembrey, Burry Port, SA16 0EZ

First Floor Rear Extension

Householder planning permission Carmarthenshire
25 Sept 2026 In Review PL/11158

Tirbach, Ffairfach, Llandeilo, SA19 6RA

Proposed rear extension to dwelling

Householder planning permission Carmarthenshire
25 Sept 2026 Under Consultation PL/11167

Y Ficerdy, High Street, St Clears, Carmarthen, SA33 4ED

Re-instatement of boundary / retaining wall

Householder planning permission Carmarthenshire
25 Sept 2026 Under Consultation PL/11445

Bryncelyn, Thornhill Road, Cwmgwili, Llanelli, SA14 6PR

Single storey rear kitchen and bathroom extension

Householder planning permission Carmarthenshire
25 Sept 2026 In Review PL/11423

Ore Knot Creative Hub, 27 Bridge Street, Carmarthen, SA31 3JS

Remove slates, carry out any repairs to timbers as necessary. Board , felt and batten roof and reuse any existing tiles, if usable and place on roof f...

Listed building consent Carmarthenshire
24 Sept 2026 In Review PL/11439

Land Rear of 4-19 Bryntirion Terrrace, Llanelli, SA15 3QD

Erection of a Single Garage

Full planning permission Carmarthenshire
24 Sept 2026 In Review PL/11447

6 Heol Pennant, Llanelli, SA14 8ES

Proposed rear balcony

Householder planning permission Carmarthenshire
23 Sept 2026 In Review PL/11444

20 Ammanford Road, Tycroes, Ammanford, SA18 3QJ

Proposed rear single storey extension and alterations to dwelling house

Householder planning permission Carmarthenshire
23 Sept 2026 In Review PL/11383

6A Bryncethin Road, Garnant, Ammanford, SA18 1YP

Proposed extension and alterations to dwelling

Householder planning permission Carmarthenshire
22 Sept 2026 In Review PL/11372

Wernos, Hafod Road, Tycroes, Ammanford, SA18 3QL

Lawful Development Certificate - single storey part rear extension to existing dwelling house

Lawful development Carmarthenshire
21 Sept 2026 Refused 8 Oct PL/11404

7 Heol Nant, Swiss Valley, Llanelli, SA14 8EL

Proposed timber fence 1.8m high on boundary

Lawful development Carmarthenshire
21 Sept 2026 In Review PL/11436

45 Heol Myrddin, Ffairfach, Llandeilo, SA19 6PD

Proposed single storey rear extension and associated works

Householder planning permission Carmarthenshire
21 Sept 2026 In Review PL/11109

48 Pentre Nicklaus Village, Llanelli, SA15 2DE

Insertion of rooflights to front and rear elevations

Householder planning permission Carmarthenshire
18 Sept 2026 In Review PL/11435

Parc Glas, Llangadog, SA19 9NF

Proposed new roof to increase first floor area and single storey extension to a domestic property

Householder planning permission Carmarthenshire
18 Sept 2026 In Review PL/11417

39 Havard Road, Llanelli, SA14 8SA

Demolition of part rear single storey extension and retention of new single storey rear extension

Householder planning permission Carmarthenshire
18 Sept 2026 Under Consultation PL/11402

16 Heol Fach, Caerbryn, Ammanford, SA18 3DJ

Construction of a double-storey extension to the dwelling at 16 Heol Fach, to provide a fourth bedroom and additional ground-floor living space, toget...

Householder planning permission Carmarthenshire
18 Sept 2026 In Review PL/11400

Felin Marlais, Brechfa, Carmarthen, SA32 7BN

Conversion of Existing Barn into a Residential Unit with alterations and extensions (Resubmission of previously refused application PL/10120)

Full planning permission Carmarthenshire
17 Sept 2026 In Review PL/11412

Kenwood, Swiss Valley, Llanelli, SA14 8BU

Demolish existing side steps and basement store and construct single storey side extension

Householder planning permission Carmarthenshire
17 Sept 2026 In Review PL/11335

Glynbyr, Rhydcymerau, Llandeilo, SA19 7RR

Demolish and rebuild adjacent threshing barn within existing footprint to provide essential ancillary office space accessed via main dwelling

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.