House extensions in Caerphilly

Caerphilly received 261 householder applications in the last 12 months - about 5 a week. Rear extensions and side extensions are the most common. Of the 205 decided so far, 156 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 66 applications
Yesterday Awaiting decision 26/0690/FULL

Acorn Cottage Pennar Lane Pentwyn-mawr Newport NP11 4GY

Demolish existing residential outbuilding (pool house) and construct detached dwelling, detached garage and associated works

Full Application Caerphilly
19 Oct 2026 Awaiting decision 26/0697/FULL

Dental Surgery 11 Station Terrace Caerphilly CF83 1HD

Erect two storey and single storey rear extensions with internal alterations to extend an existing two storey dental practice, works include the erect...

Full Application Caerphilly
15 Oct 2026 Awaiting decision 26/0691/HH

The Ferns Watford Road Watford Caerphilly CF83 1NE

Erect a new porch, new pool enclosure, adjustments to windows and doors

Householder Application Caerphilly
15 Oct 2026 Awaiting decision 26/0677/HH

17 Bryn-rhedyn Caerphilly CF83 3BT

Demolish existing garage and erect a two storey rear and single storey wrap around extension

Householder Application Caerphilly
14 Oct 2026 Awaiting decision 26/0693/HH

8 Mount Pleasant Bargoed CF81 8UU

Erect single storey side and rear wrap around extension with alterations

Householder Application Caerphilly
8 Oct 2026 Awaiting decision 26/0682/HH

Pen-y-cwm 22 Merthyr Road Princetown Tredegar NP22 3AE

Convert existing integral garage into Granny flat, demolish existing car port and replace with new single garage

Householder Application Caerphilly
8 Oct 2026 Awaiting decision 26/0681/RET

39 Twyn Road Abercarn Newport NP11 5JY

Retain and complete raised parking area at the front of the property

Householder Application Caerphilly
7 Oct 2026 Awaiting decision 26/0675/FULL

Llanfabon Inn Cilfynydd Road To Pant-du Road Llanfabon Treharris CF46 6PG

Erect two domestic out buildings in curtilage of dwelling at former Llanfabon Inn

Full Application Caerphilly
7 Oct 2026 Awaiting decision 26/0666/HH

1 Rhos Street Caerphilly CF83 3HP

Demolish existing conservatory and erect a single storey flat roof rear extension

Householder Application Caerphilly
7 Oct 2026 Awaiting decision 26/0653/HH

1 Bedwlwyn Close Ystrad Mynach Hengoed CF82 7BA

Erect single storey rear extension, partial conversion of garage and alterations to front and rear canopies and garage roof

Householder Application Caerphilly
7 Oct 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
5 Oct 2026 Awaiting decision 26/0676/HH

3 Heol Morien Nelson Treharris CF46 6JA

Erect first floor rear extension

Householder Application Caerphilly
5 Oct 2026 Awaiting decision 26/0673/HH

15 Rowan Close Nelson Treharris CF46 6EN

Erect two storey rear extension

Householder Application Caerphilly
5 Oct 2026 Awaiting decision 26/0667/HH

3 Herbert Avenue Pontymister Risca Newport NP11 6JS

Erect single storey side extension

Householder Application Caerphilly
2 Oct 2026 Awaiting decision 26/0632/COU

The Coach House Ivy Bush Cottages Oakdale Blackwood NP12 0DY

Change the use of existing property into three dwellings & extension to front elevation

Change of Use Caerphilly
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
29 Sept 2026 Awaiting decision 26/0648/RET

3 Pennine Close Trenewydd Park Risca Newport NP11 6QS

Retain raised vehicle hardstanding, associated retaining walls and engineering works and timber boundary fencing

Retain Development Already Carried Out Caerphilly
29 Sept 2026 Awaiting decision 26/0609/HH

2 Edward Terrace Abertridwr Caerphilly CF83 4FL

Erect rear ground floor and basement extension and attic conversion

Householder Application Caerphilly
28 Sept 2026 Awaiting decision 26/0649/HH

Graig View Cottage The Row To Gwern-y-goytre Draethen Newport NP10 8GF

Erect a raised decking area

Householder Application Caerphilly
28 Sept 2026 Awaiting decision 26/0544/RET

Rosita's The Visitor Centre - Caerphilly The Twyn Caerphilly CF83 1JL

Retain external covered dining facility to the terrace

Retain Development Already Carried Out Caerphilly
25 Sept 2026 Awaiting decision 26/0458/RET

39 Melin Street Cwmfelinfach Newport NP11 7GZ

Retain feather edge styled timber fence around the perimeter of the property

Retain Development Already Carried Out Caerphilly
21 Sept 2026 Awaiting decision 26/0630/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 works and ancillary outdoor wellbeing facility

Full Application Caerphilly
21 Sept 2026 Awaiting decision 26/0629/FULL

Power Athletics Caerphilly Unit A De Clare House 4 Sir Alfred Owen Way Pontygwindy Industrial Estate Caerphilly CF83 3HU

Install two roller-shutter doors and two pedestrian-access doors within the southern side elevation, removal of an existing fire exit door and associa...

Full Application Caerphilly
21 Sept 2026 Awaiting decision 26/0462/FULL

Mini Miners Centre Lisburn Road Ystrad Mynach Hengoed CF82 7AS

Erect a small front porch extension

Full Application Caerphilly
21 Sept 2026 Awaiting decision 26/0564/RET

Tir Adam Uchaf Farm Heol Adam Gelligaer Hengoed CF82 8FU

Retain tipping operation to form level plateau (for use in association with approved care home), boundary fence along western site boundary, alteratio...

Retain Development Already Carried Out Caerphilly
18 Sept 2026 Awaiting decision 26/0627/HH

Hafodrisclawdd-isaf Hafodrisclawdd-isaf Farm Lane Manmoel Blackwood NP12 0HZ

Remove the existing single-storey flat-roof extension and replace with a new single-storey extension featuring a pitched roof, alongside internal reno...

Householder Application Caerphilly
18 Sept 2026 Awaiting decision 26/0626/RET

55 Cardiff Road Bargoed

Retain new side entrance door, new fire exit and new window

Retain Development Already Carried Out Caerphilly
17 Sept 2026 Awaiting decision 26/0623/HH

77 Drum Tower View Caerphilly CF83 2XJ

Erect conservatory to the rear of the property

Householder Application Caerphilly
16 Sept 2026 Awaiting decision 26/0620/HH

13 School Street Elliot's Town New Tredegar NP24 6NG

Erect first floor extension on existing ground floor rear extension

Householder Application Caerphilly
15 Sept 2026 Awaiting decision 26/0616/HH

Maes-y-garn Maesruddud Lane Blackwood NP12 0AG

Erect two storey side extension and detached double garage with car port

Householder Application Caerphilly
15 Sept 2026 Awaiting decision 26/0618/HH

16 Wesley Road Caerphilly CF83 1SS

Convert garage into living accommodation with a new window in lieu of existing garage door

Householder Application Caerphilly
15 Sept 2026 Awaiting decision 26/0617/RET

24 Bronwydd Oakdale Blackwood NP12 0GX

Retain construction of raised decking in rear garden

Retain Development Already Carried Out Caerphilly
15 Sept 2026 Awaiting decision 26/0597/RET

The Countryman Cottage Countryman Court Heol Tynewydd Bedwellty Blackwood NP12 0BJ

Retain boundary fence at reduced height of 1.8m to garden area

Retain Development Already Carried Out Caerphilly
11 Sept 2026 Awaiting decision 26/0611/CLPU

24 Heol Cwarrel Clark Caerphilly CF83 2NE

Obtain a Lawful Development Certificate for conversion of the existing integral garage into habitable accommodation, replacement of the garage door wi...

Certificate Lawful Proposed Use/Dev Caerphilly
11 Sept 2026 Awaiting decision 26/0612/HH

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

Erect first floor en-suite extension to rear bedroom

Householder Application Caerphilly
10 Sept 2026 Awaiting decision 26/0610/RET

1 Commercial Street Pengam Blackwood NP12 3ST

Retain and complete the construction of a detached garage

Retain Development Already Carried Out Caerphilly
10 Sept 2026 Awaiting decision 26/0586/LBC

Beddau Farm 2 St Cenydd Road Trecenydd Caerphilly CF83 2TB

Reinstate a former historic door opening within the external wall of the listed barn

Listed Building Consent Caerphilly
10 Sept 2026 Awaiting decision 26/0607/HH

Berth Gron Tydu Road Nelson Treharris CF46 6PH

Convert attic within the single storey wing of dwelling incorporating a raised ridge height and dormer extension(s); erect orangery; erect balcony and...

Householder Application Caerphilly
8 Sept 2026 Awaiting decision 26/0603/HH

3A Bryn Road Cefn Fforest Blackwood NP12 3NA

Erect two storey side extension

Householder Application Caerphilly
7 Sept 2026 Awaiting decision 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 Awaiting decision 26/0559/HH

54 High Meadow Abercarn Newport NP11 5AD

Erect two storey side extension

Householder Application Caerphilly
3 Sept 2026 Awaiting decision 26/0585/HH

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

Convert existing garage to living accommodation

Householder Application Caerphilly
2 Sept 2026 Awaiting decision 26/0590/HH

1 Plynlimon Avenue Croespenmaen Newport NP11 3GR

Erect first floor and ground floor extension

Householder Application Caerphilly
2 Sept 2026 Awaiting decision 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 Awaiting decision 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 Approved 9 Oct 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
28 Aug 2026 Approved 23 Oct 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
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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 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.