House Extension planning applications in Wales

Search house extension, loft conversion, and dormer applications by postcode, town, street, address, council, or planning reference.

Covers householder extension applications: single-storey rear and two-storey side extensions, loft conversions and dormers, wraparound extensions, porches, garage conversions, outbuildings and garden rooms, orangeries and conservatories.

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Showing 50 of 1,883 applications
2 days ago Application Valid FUL/000824/26

OAK TREE COTTAGE, Lower Mountain Road, Penyffordd, Chester, CH4 0EU

Proposed side single storey extension, replacement glazing and new timber frame

Full - Building Works Flintshire
2 days ago Application Valid NP/26/0504/FUL

T P Hughes, 13A Upper Frog Street, Tenby, Pembrokeshire, SA70 7JD

Proposed rooflights, replacement windows, rear access ladder and replacement of rear canopy

Full Pembroke Coast
5 Oct 2026 Registered 26/02092/LBC

Shah Jalal Islamic Cultural Centre Crwys Road Roath Cardiff CF24 4NA

Proposed installation of a wooden and glass panel to protect the porch from rain and weather

Listed Building Consent Cardiff
5 Oct 2026 Pending 26/02094/FUL

29 Cranbrook Street Cathays Cardiff CF24 4AL

Proposed construction of a dormer loft conversion and Change of Use from a Dwellinghouse (Use Class C3) to House in Multiple Occupation (Use Class C4)...

Cardiff
5 Oct 2026 Registered 26/02096/HSE

8 Deganwy Close Llanishen Cardiff CF14 5JT

Porch extension.

Householder Planning Permission Cardiff
5 Oct 2026 Identification of Consultees FUL/000773/26

33, Mold Road, Broughton, Chester, CH4 0PQ

Retrospective planning application for Summerhouse/garden room

Full - Building Works Flintshire
5 Oct 2026 Identification of Consultees FUL/000819/26

OSBORNE BARN, Wrexham Road, Penyffordd, Chester, CH4 0HT

First Floor Extension with Double Storey Feature Extension for Stairway

Full - Building Works Flintshire
5 Oct 2026 In Progress C26/0594/40/DT

GWYDDFOR, Rhosfawr, Pwllheli, Gwynedd, LL53 6YA

Adeiladu estyniadau unllawr ochr a chefn / Construction of side and rear single storey extensions

Householder Planning Gwynedd
5 Oct 2026 In Progress C26/0471/15/TC

CRAIG Y NOS Church Lane, Llanberis, Caernarfon, Gwynedd, LL55 4TF

Cais tystysgrif cyfreithlon er mwyn cadarnhau dechreuad materol bod caniatâd ddymchwel estyniad ar gweithdy presennol ac adeiladu estyniad newydd yngh...

Lawful Development Certificate Existing/Proposed Gwynedd
5 Oct 2026 Consultations Sent 26/0417/PA

69, Park Street, Pembroke Dock, Pembrokeshire, SA72 6BL

Alterations & extension

Full Pembrokeshire
5 Oct 2026 Being Considered 2026/1626/FUL

119 Newton Road Newton Swansea SA3 4SW

Detached garage with side workshop/bathroom extension and first floor home office (amendment to planning permission 2025/2385/FUL granted 10th Februar...

Full Plans Swansea
5 Oct 2026 Being Considered 2026/1634/FUL

8 Bishops Walk Morriston Swansea SA6 6EE

Retention and completion of proposed outbuilding

Full Plans Swansea
3 Oct 2026 In Progress A260614

The Moody Cow, Farm Shop And Cafe, BARGOED, Llwyncelyn, Aberaeron, Ceredigion, SA46 0HL

Proposed Extension & Alterations to Existing Building "The Moody Cow"

Full Planning Ceredigion
3 Oct 2026 Application Valid FUL/000806/26

66, Hawarden Road, Caergwrle, Wrexham, LL12 9BY

Removal of hedging to the front/side of front garden, new parking

Full - Building Works Flintshire
2 Oct 2026 Registered 26/02084/CLPUD

24 Bassetts Field Rhiwbina Cardiff CF14 9UG

Proposed single storey flat roof extension to rear

Cert of Lawfulness Proposed (s192) Cardiff
2 Oct 2026 Registered 26/02089/HSE

72 Amesbury Road Penylan Cardiff CF23 5DY

Proposed Loft & Rebuild of Existing Extension

Householder Planning Permission Cardiff
2 Oct 2026 Registered 26/02090/HSE

104 Heol Hir Llanishen Cardiff CF14 5AD

Proposed single storey rear extension, small double height extension and attic conversion including roof extensions

Householder Planning Permission Cardiff
2 Oct 2026 Pending Consideration 30/2026/0420/HH

BRYNDYFFRYN, Trefnant, Denbigh, Denbighshire, LL16 5UG

Trosi stabl diangen i ffurfio atodiad a gwaith cysylltiedig / Conversion of redundant stable to form an annex and associated works

Householder Application Denbighshire
2 Oct 2026 Identification of Consultees FUL/000810/26

51, Plymouth Street, Shotton, Deeside, CH5 1HZ

Rear extension

Full - Building Works Flintshire
2 Oct 2026 Consultation period opened FUL/000817/26

2, Firbeck Close, Broughton, Chester, CH4 0TG

Proposed side and rear extension and re-model of existing garage

Full - Building Works Flintshire
2 Oct 2026 Consultation period opened FUL/000820/26

11, Godrer Mynydd, Gwernymynydd, Mold, CH7 4AD

Erection of single storey flat roofed extension at rear of dwelling.

Full - Building Works Flintshire
2 Oct 2026 Pending Consideration DM/2026/01195

4 Pen Y Pound Court Abergavenny Monmouthshire NP7 7RJ

Proposed first floor balcony to rear elevation.

Householder Monmouthshire
2 Oct 2026 Application Valid NP/26/0472/CLE

The Barn, Penfeidr, Brynberian, Crymych, Pembrokeshire, SA41 3TJ

Lawful development certificate for conservatory completed in 2011

Cert of Lawfulness Existing Use Pembroke Coast
2 Oct 2026 Being Considered 2026/1618/FUL

58 Roger Street Treboeth Swansea SA5 9AS

Demolition of rear conservatory and part of attached garage/workshop, and construction of a two storey rear extension. Provision of a flat roof and ex...

Full Plans Swansea
1 Oct 2026 Awaiting decision 26/24948/FUL

Maes Pant Llangadog Carmarthenshire SA19 9UP

Proposed detached workshop / studio

Full Application Brecon Beacons
1 Oct 2026 Registered 26/02073/HSE

122 Parc-y-fro Creigiau Cardiff CF15 9SB

Proposed two storey side extension & front porch canopy

Householder Planning Permission Cardiff
1 Oct 2026 Registered 26/02072/HSE

18 Heol Caerhys Rhiwbina Cardiff CF14 6AN

Demolition of existing single story garage to the side of the property. Demolition of existing single story extension and conservatory to the rear of ...

Householder Planning Permission Cardiff
1 Oct 2026 Consultation period opened FUL/000799/26

The Old Telephone Exchange, Rhosesmor Road, Halkyn, Holywell, CH8 8DL

Proposed side and rear extensions and internal alterations

Full - Building Works Flintshire
1 Oct 2026 Under Consideration LDP/000783/26

9, Ash View, Aston, Deeside, CH5 1BL

Lawful Development certificate for proposed garage conversion to a micro-scale m

Certificate of Lawfulness Sec 192 Flintshire
1 Oct 2026 In Progress C26/0591/39/DT

BRYN HEDD, Mynytho, Pwllheli, Gwynedd, LL53 7RF

Dymchwel yr estyniad un llawr presennol i’r cefn a chodi estyniad un llawr newydd yn ei le, gyda balconi uwchben a grisiau allanol. / Proposed demolit...

Householder Planning Gwynedd
1 Oct 2026 Unknown P/26/0219

Summerfield 8 Pontsarn Close Pontsarn Merthyr Tydfil CF48 2TW

Remove conservatory and chimney; remove and replace the roof including increasing the ridge height of the property; construct a two-storey front exten...

Full Merthyr Tydfil
1 Oct 2026 Consultations Sent 26/0435/PA

Cross Cottage, MARTLETWY, Narberth, Pembrokeshire, SA67 8AJ

Dwelling extension

Full Pembrokeshire
1 Oct 2026 Being Considered 2026/1607/PLD

77A Y Llanerch Pontlliw Swansea SA4 9DR

Conversion of garage to photography studio (application for a Certificate of Proposed Lawful Development)

Lawful Dev. Cert - Proposed Swansea
1 Oct 2026 Being Considered 2026/1614/FUL

5 Penuel Close Gorseinon Swansea SA4 6PU

Single storey, side and rear extension

Full Plans Swansea
1 Oct 2026 Being Considered 2026/1608/FUL

120 Walter Road City Centre Swansea SA1 5RF

Infill ground floor extension, second floor rear extension and new flat roof dormer.

Full Plans Swansea
30 Sept 2026 Awaiting decision 26/0656/FULL

102 Tan-y-bryn Rhymney Tredegar NP22 5LG

Erect conservatory to rear of property

Full Application Caerphilly
30 Sept 2026 Registered 26/02068/HSE

38 Major Road Canton Cardiff CF5 1PF

Single-storey rear extension

Householder Planning Permission Cardiff
30 Sept 2026 Registered 26/02070/HSE

43 Dalton Street Cathays Cardiff CF24 4HB

Retention of Existing Rear and Side Ground-Floor Extensions and Proposed Erection of Rear and Side Dormer Extensions.

Householder Planning Permission Cardiff
30 Sept 2026 In Progress A260609

Y GARTH Station Road, Tregaron, Ceredigion, SY25 6HY

Proposed rear extension & alterations

Householder Planning Ceredigion
30 Sept 2026 Under Consideration LDP/000812/26

1, The Sidings, Buckley, CH7 3DQ

LDC - Single Storey Rear Extension

Certificate of Lawfulness Sec 192 Flintshire
30 Sept 2026 Approved DM/2026/01185

24 Coopers Way Llanfoist Monmouthshire NP7 9LZ

A single story rear house extension

Certificate of Prop Lawful Use or Dev Monmouthshire
30 Sept 2026 Awaiting decision P2026/0633

Melin Primary School Mile End Row Neath Neath Port Talbot SA11 2ED

Lawful Development certificate (proposed) for new fence and gate

Proposed Lawful Development Certificate Neath
30 Sept 2026 Consultations Sent 26/0406/PA

41, Hayston Avenue, Hakin, Milford Haven, Pembrokeshire, SA73 3EA

Reconfiguration of existing dwelling, replacement dormer and parking area

Full Pembrokeshire
30 Sept 2026 Being Considered 2026/1594/FUL

8 Woodcote Killay Swansea SA2 7AZ

Repair, refurbishment and extension of detached outbuilding

Full Plans Swansea
30 Sept 2026 Being Considered 2026/1603/FUL

26 Brynllwchwr Road Loughor Swansea SA4 6SG

Ground floor rear extension and steps and handrail to front entrance

Full Plans Swansea
30 Sept 2026 Being Considered 2026/1601/PLD

10 Dulais Grove Sketty Swansea SA2 8BL

Single storey rear extension and installation of two ground floor side windows (application for a Certificate of Proposed Lawful Development)

Lawful Dev. Cert - Proposed Swansea
30 Sept 2026 Pending Consideration 26/P/0461/CEA

Drws Y Coed Victoria Road Abersychan Pontypool Torfaen NP4 8PT

Proposed Garage

Cert of Lawful Use/Operation - Proposed Torfaen
30 Sept 2026 Pending Consideration 26/P/0463/VAR

Sunnyview Lewis Street Abersychan Pontypool Torfaen NP4 7AR

Loft conversion with dormer

Vary/Remove a condition (Section 73) Torfaen
29 Sept 2026 Valid FPL/2026/215

Ysgol Syr Thomas Jones, Amlwch

Cais llawn ar gyfer gosod gorchydd amddiffyn o'r tywydd ar y to fflat, ynghyd ac ail osod ffenestri a ffenestri to yn / Full application to install fl...

Full Planning Permission Anglesey
29 Sept 2026 Awaiting decision 26/24941/FUL

Gurnos Bethlehem Llangadog Sir Gar SA19 9DT

Change of use of attached barn to granny annex with internal connecting door

Full Application Brecon Beacons
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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 extensions planning applications anywhere in Wales?
Yes. Click the "Set up alerts" button on this page and you'll get a daily (or weekly) email listing every new extensions application submitted anywhere in Wales. No need to pick a postcode or draw a map - pick the category once, choose your frequency, and we'll do the rest.

Extensions planning applications elsewhere

Data updated daily across Wales's active councils.