House extensions in Caerphilly

Caerphilly received 223 householder applications in the last 12 months - about 4 a week. Rear extensions and side extensions are the most common. Of the 187 decided so far, 141 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

65
|
18
|
9
Get alerts for Caerphilly

Filter applications

Date receivedLast 90 days
Date receivedLast 90 days
Select one year, or two for a range.
Number of homesAny
StatusAny
Application routeAny
Application type1 selected
KeywordsNone
Match

Matches words or phrases in the application address and description.

Showing 50 of 65 applications
7 Sept 2026 Pending 26/0596/HH

3 Crown Lane Pontllanfraith Blackwood NP12 2GD

Erect two storey side extension and a single storey rear extension

Householder Application Caerphilly
4 Sept 2026 Pending 26/0559/HH

54 High Meadow Abercarn Newport NP11 5AD

Erect two storey side extension

Householder Application Caerphilly
3 Sept 2026 Pending 26/0585/HH

2 Farm Close Tir-y-berth Hengoed CF82 8BF

Convert existing garage to living accommodation

Householder Application Caerphilly
2 Sept 2026 Pending 26/0590/HH

1 Plynlimon Avenue Croespenmaen Newport NP11 3GR

Erect first floor and ground floor extension

Householder Application Caerphilly
2 Sept 2026 Pending 26/0579/CLPU

The Barn Pen Y Caeau Farm Abercarn Mountain Road Hafodyrynys Newport NP11 5AY

Erect single-storey timber stable block within the existing residential curtilage of the dwelling,

Certificate Lawful Proposed Use/Dev Caerphilly
2 Sept 2026 Pending 26/0578/HH

Ty Ar Y Graig Lower Road Elliot's Town New Tredegar NP24 6EB

Erect single storey external canopy to side elevation

Householder Application Caerphilly
2 Sept 2026 Pending 26/0582/CLPU

41 Blacksmith Close Oakdale Blackwood NP12 0BG

Obtain a Lawful Development Certificate to erect single-storey rear extension to the existing dwellinghouse

Certificate Lawful Proposed Use/Dev Caerphilly
1 Sept 2026 Awaiting decision 26/0413/RET

4 Tai Fforest Cottages Caerphilly Road Nelson Treharris CF46 6PP

Retain and complete replacement dwelling, new retaining walls and associated works

Retain Development Already Carried Out Caerphilly
28 Aug 2026 Awaiting decision 26/0573/FULL

Cwm Farm Queens Road Elliot's Town New Tredegar NP24 6NN

Convert barn and erect single storey rear extension and carry out internal alterations

Full Application Caerphilly
25 Aug 2026 Awaiting decision 26/0565/HH

19 Cae Collen Blackwood NP12 1FF

Demolish existing attached side garage, erect two-storey side extension, enlarge existing single-storey rear extension, provide integrated single gara...

Householder Application Caerphilly
25 Aug 2026 Awaiting decision 26/0523/COU

78 - 84 Commercial Street Pontymister Risca Newport NP11 6BA

Change the use from B1 to C3 to create 4 No. 2 bedroom flats with loft conversions and ground floor garages

Change of Use Caerphilly
24 Aug 2026 Awaiting decision 26/0567/HH

Cwm Farm Blackbrook Road Caerphilly CF83 1NF

Erect two storey side extension

Householder Application Caerphilly
19 Aug 2026 Awaiting decision 26/0538/HH

67 Waun Draw Caerphilly CF83 3SL

Convert attic and erect two storey extension

Householder Application Caerphilly
18 Aug 2026 Awaiting decision 26/0543/HH

1 Gelli Dawel Energlyn Caerphilly CF83 2QT

Erect rear extension and convert existing garage to use as living accommodation with window to front elevation

Householder Application Caerphilly
13 Aug 2026 Awaiting decision 26/0539/HH

33 Heol Tasker Nelson Treharris CF46 6JB

Part demolish existing garage and erect a single storey extension

Householder Application Caerphilly
12 Aug 2026 Awaiting decision 26/0431/RET

Torbay House 278 Bedwas Road Caerphilly CF83 3AW

Retain and complete the creation of new vehicular access, replacement of driveway walls, reconfiguration of driveway and access to property to enable ...

Retain Development Already Carried Out Caerphilly
12 Aug 2026 Awaiting decision 26/0486/HH

Tir Adam Uchaf Farm Heol Adam Gelligaer Hengoed CF82 8FU

Retain a two-storey extension, detached outbuilding and raised patio area together with the erection of a proposed single-storey extension

Retain Development Already Carried Out Caerphilly
12 Aug 2026 Awaiting decision 26/0532/HH

8 Lon-y-waun Caerphilly CF83 1DQ

Remove existing conservatory and erect a single storey rear extension including internal alterations

Householder Application Caerphilly
11 Aug 2026 Awaiting decision 26/0536/HH

11 Marsh Court Aberbargoed Bargoed CF81 9BF

Extend existing garage

Householder Application Caerphilly
10 Aug 2026 Awaiting decision 26/0497/HH

121 Treowen Road Treowen Newport NP11 3DQ

Erect first floor rear extension

Householder Application Caerphilly
7 Aug 2026 Awaiting decision 26/0525/RET

13 Commercial Street Pontymister Risca Newport NP11 6AW

Retain carport

Retain Development Already Carried Out Caerphilly
5 Aug 2026 Awaiting decision 26/0528/HH

Bryncanol Ty Canol Lane Machen Caerphilly CF83 8QE

Demolish existing lean-to rear extension, raise ridge height, erect first-floor front extension, convert loft to include two dormers to the front and ...

Householder Application Caerphilly
4 Aug 2026 Awaiting decision 26/0481/LBC

12 Middle Row Bute Town Rhymney Tredegar NP22 5QJ

Remove existing sash windows and wooden doors and replace with double glazed uPVC sash windows and composite front door, replace back door with uPVC d...

Listed Building Consent Caerphilly
4 Aug 2026 Approved 26/0518/CLPU

2 Rhyd Y Gwern Lane Draethen Newport NP10 8GH

Obtain a Lawful Development Certificate to erect a timber boundary fence 2m high to east elevation to include 2m vehicular gates to private right of w...

Certificate Lawful Proposed Use/Dev Caerphilly
31 Jul 2026 Approved 26/0132/CLEU

27 Addison Street Cefn Fforest Blackwood NP12 1EN

Obtain a Lawful Development Certificate for existing use as single storey extension and detached garage

Certificate Lawful Existing Use/Dev Caerphilly
30 Jul 2026 Awaiting decision 26/0505/HH

18 Redbrook Avenue Trethomas Caerphilly CF83 8DB

Erect split level two storey extension to rear of property

Householder Application Caerphilly
29 Jul 2026 Awaiting decision 26/0498/HH

85 High Street Nelson Treharris CF46 6HA

Demolish existing single storey rear extension and erect a two storey side extension and single storey rear extension

Householder Application Caerphilly
29 Jul 2026 Approved 26/0508/CLPU

92 Markham Crescent Oakdale Blackwood NP12 0LY

Obtain a Lawful Development Certificate for a single storey rear extension

Certificate Lawful Proposed Use/Dev Caerphilly
28 Jul 2026 Awaiting decision 26/0501/HH

22 Lewis Crescent Gilfach Bargoed CF81 8JU

Erect single storey rear extension

Householder Application Caerphilly
28 Jul 2026 Awaiting decision 26/0503/HH

13 Ebbw Meadow Abercarn Newport NP11 5GL

Erect a double storey rear extension with a single storey side extension

Householder Application Caerphilly
23 Jul 2026 Approved 26/0488/FULL

Bethania Church Upper Road Elliot's Town

Install 2 No. Conservation Velux windows in existing roof

Full Application Caerphilly
21 Jul 2026 Refused 26/0485/FULL

Rudry Parish Hall Garth Place To Rhydri Primary School Rudry Caerphilly CF83 3DF

Erect a pre built timber sauna, timber storage shed and raised composite decking with associated low-impact ground screw foundations, landscaping work...

Full Application Caerphilly
21 Jul 2026 Approved 26/0447/CLEU

5 Pantyfid Road Aberbargoed Bargoed CF81 9DT

Obtain a Certificate of Lawfulness for the existing use of decking

Certificate Lawful Existing Use/Dev Caerphilly
16 Jul 2026 Awaiting decision 26/0446/HH

Primrose Cottage Yew Tree Cottage To The Row Draethen Newport NP10 8GB

Demolish existing conservatory and erect oak extension/conservatory (fully glazed with tiled roof)

Householder Application Caerphilly
15 Jul 2026 Refused 26/0478/HH

36 Bryn Yr Ysgol Penyrheol Caerphilly CF83 2BY

Demolish existing garage and erect a two storey side extension

Householder Application Caerphilly
15 Jul 2026 Approved 26/0471/HH

28 Denbigh Court Hendredenny Caerphilly CF83 2UN

Erect two storey side and rear extension, enlarge existing rear outbuilding, construct an accessible entrance ramp and re grade front garden to provid...

Householder Application Caerphilly
14 Jul 2026 Approved 26/0475/HH

13 Maes-y-drudwen Caerphilly CF83 2QG

Erect ground floor bathroom extension

Householder Application Caerphilly
14 Jul 2026 Approved 26/0470/HH

21 Heol Isaf Nelson Treharris CF46 6NS

Demolish existing rear conservatory and detached garage and construct new single storey rear extension

Householder Application Caerphilly
13 Jul 2026 Awaiting decision 26/0468/HH

90 First Avenue Trecenydd Caerphilly CF83 2SD

Erect double storey side extension & single storey rear extension

Householder Application Caerphilly
13 Jul 2026 Approved 26/0467/HH

1 Woodward Avenue Crosskeys Newport NP11 7BS

Erect garage and off road parking

Householder Application Caerphilly
13 Jul 2026 Approved 26/0465/FULL

Trethomas Life Centre Heol-yr-ysgol Trethomas Caerphilly CF83 8FL

Erect single storey Annex for charitable use including small group sessions, cooking and washing/showering facilities

Full Application Caerphilly
13 Jul 2026 Approved 26/0466/HH

Windrush St Martin's Crescent Caerphilly CF83 1ER

Erect side extension and convert garage

Householder Application Caerphilly
10 Jul 2026 Refused 26/0460/HH

2 Tan-y-llan Terrace Rhymney Tredegar NP22 5HE

Erect first floor en-suite extension to rear bedroom

Householder Application Caerphilly
9 Jul 2026 Approved 26/0461/HH

66 Woodfieldside Road Gelli-haf Pontllanfraith Blackwood NP12 2RG

Erect conservatory to the rear of the property

Householder Application Caerphilly
8 Jul 2026 Approved 26/0459/FULL

Moruzzi Landscapes Limited Nantgarw Road Caerphilly CF83 1BW

Erect security fencing & automated gate to site frontage with Nantgarw Road

Full Application Caerphilly
7 Jul 2026 Approved 26/0436/HH

1 Ludlow Street Caerphilly CF83 1GG

Convert existing garage to living accommodation (home/office) in the rear garden

Householder Application Caerphilly
7 Jul 2026 Approved 26/0457/HH

56 Heolddu Road Bargoed CF81 8RQ

Erect first floor extension

Householder Application Caerphilly
7 Jul 2026 Awaiting decision 26/0450/FULL

Moores Motor Repairs Ltd Islwyn Road Wattsville Newport NP11 7QD

Erect steel portal unit and demolish exiting steel garage structure following erection of new structure

Full Application Caerphilly
6 Jul 2026 Refused 26/0456/CLPU

38 Graig-y-fedw Abertridwr Caerphilly CF83 4AR

Obtain a Lawful Development Certificate for proposed single storey rear extension

Certificate Lawful Proposed Use/Dev Caerphilly
2 Jul 2026 Approved 26/0439/HH

Cyprus House 23 Navigation Road Risca Newport NP11 6FF

Construct a metal motorcycle shed on the driveway

Householder Application Caerphilly
Recency
Last 2 weeks
2-4 weeks
1-2 months
Older

Get free email alerts for new extensions applications in Caerphilly

Set up alerts

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 Caerphilly?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Caerphilly. You can also narrow the alert to a postcode, street, or drawn area.

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