House extensions in Caerphilly

Caerphilly received 143 householder applications in the last 12 months - about 3 a week. Rear extensions and side extensions are the most common. Of the 92 decided so far, 66 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

82 last 90 days
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27 last 30 days
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12 last 14 days

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Showing 50 of 82 applications
26/0461/HH 9 Jul 2026 Pending

66 Woodfieldside Road Gelli-haf Pontllanfraith Blackwood NP12 2RG

Erect conservatory to the rear of the property

Caerphilly 9 Jul 2026
26/0459/FULL 8 Jul 2026 Pending

Moruzzi Landscapes Limited Nantgarw Road Caerphilly CF83 1BW

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

Caerphilly 8 Jul 2026
26/0457/HH 7 Jul 2026 Pending

56 Heolddu Road Bargoed CF81 8RQ

Erect first floor extension

Caerphilly 7 Jul 2026
26/0436/HH 7 Jul 2026 Pending

1 Ludlow Street Caerphilly CF83 1GG

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

Caerphilly 7 Jul 2026
26/0460/HH 7 Jul 2026 Pending

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

Erect first floor en-suite to rear bedroom

Caerphilly 7 Jul 2026
26/0456/CLPU 6 Jul 2026 Pending

38 Graig-y-fedw Abertridwr Caerphilly CF83 4AR

Obtain a Lawful Development Certificate for proposed single storey rear extension

Caerphilly 6 Jul 2026
26/0448/HH 1 Jul 2026 Awaiting decision

18 Rockleigh Avenue Aberbargoed Bargoed CF81 9BQ

Erect single storey side extension

Householder Application Caerphilly 1 Jul 2026
26/0450/FULL 1 Jul 2026 Pending

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

Caerphilly 1 Jul 2026
26/0440/HH 26 Jun 2026 Awaiting decision

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

Erect first floor extension on existing ground floor rear extension

Householder Application Caerphilly 26 Jun 2026
26/0439/HH 25 Jun 2026 Awaiting decision

Cyprus House 23 Navigation Road Risca Newport NP11 6FF

Construct a metal motorcycle shed on the driveway

Householder Application Caerphilly 25 Jun 2026
26/0432/FULL 24 Jun 2026 Awaiting decision

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

Install three roller shutter doors and associated external alterations

Full Application Caerphilly 24 Jun 2026
26/0438/HH 24 Jun 2026 Awaiting decision

19 Coed Duon View Pentwyn-mawr Newport NP11 4EN

Proposed two storey side and rear extension including canopy/porch to front elevation

Householder Application Caerphilly 24 Jun 2026
26/0430/HH 23 Jun 2026 Awaiting decision

123 Almond Avenue Ty Sign Risca Newport NP11 6PG

Construct ramp, chair lift and assiocated external works

Householder Application Caerphilly 23 Jun 2026
26/0425/FULL 22 Jun 2026 Awaiting decision

15 Springfield Road Pontymister Risca Newport NP11 6LY

Partial change the use of approximately 50% of an existing domestic outbuilding to form a small appointment-only hair studio, together with internal r...

Full Application Caerphilly 22 Jun 2026
26/0426/HH 22 Jun 2026 Awaiting decision

2 Rhyd Y Gwern Lane Draethen Newport NP10 8GH

Erect a 2m timber fence along the boundary to No 1 Rhyd Y Gwern

Householder Application Caerphilly 22 Jun 2026
26/0424/HH 19 Jun 2026 Awaiting decision

2 Graig View Highland Terrace Blackwood NP12 1QN

Erect a garden studio

Householder Application Caerphilly 19 Jun 2026
26/0427/FULL 17 Jun 2026 Awaiting decision

86 - 108 Elm Drive Ty Sign Risca

Carry out external insulation and over render with replacement roof

Full Application Caerphilly 17 Jun 2026
26/0423/CLPU 17 Jun 2026 Awaiting decision

4 Lon-y-deri Caerphilly CF83 1DS

Obtain Certificate of Lawful Proposed Development for extension to side and rear of property

Certificate Lawful Proposed Use/Dev Caerphilly 17 Jun 2026
26/0415/HH 16 Jun 2026 Awaiting decision

2 Llanarth Villas Llanarth Street Brynawel Wattsville Newport NP11 7QX

Erect single storey side extension

Householder Application Caerphilly 16 Jun 2026
26/0407/FULL 16 Jun 2026 Awaiting decision

Perfect Nails Unit 8 4 - 8 Penallta Road Ystrad Mynach Hengoed CF82 7AP

Erect single storey side/rear extension to existing ground floor commercial premises

Full Application Caerphilly 16 Jun 2026
26/0411/COU 15 Jun 2026 Awaiting decision

115 Newport Road Cwmcarn Newport NP11 7LZ

Change the use of first floor to residential and erect first floor rear extension

Change of Use Caerphilly 15 Jun 2026
26/0401/HH 12 Jun 2026 Awaiting decision

15 Pen-y-cwarel Road Wyllie Blackwood NP12 2HP

Erect two storey rear extension and front porch

Householder Application Caerphilly 12 Jun 2026
26/0403/HH 12 Jun 2026 Awaiting decision

5 Nant-y-ffyddlon Penpedairheol Hengoed CF82 8DQ

Erect two storey side extension combined with attic conversion

Householder Application Caerphilly 12 Jun 2026
26/0402/HH 12 Jun 2026 Awaiting decision

20 Caradoc Street Cwmcarn Newport NP11 7EF

Install Bi-folding gates to replace demolished wall for access to driveway

Householder Application Caerphilly 12 Jun 2026
26/0413/RET 12 Jun 2026 Awaiting decision

4 Tai Fforest Cottages Caerphilly Road Nelson Treharris CF46 6PP

Retain and complete replacement dwelling, new detached garage and associated works

Retain Development Already Carried Out Caerphilly 12 Jun 2026
26/0393/HH 9 Jun 2026 Awaiting decision

10 Virginia View Caerphilly CF83 3JA

Erect single storey rear extension

Householder Application Caerphilly 9 Jun 2026
26/0397/FULL 9 Jun 2026 Awaiting decision

Essilor Unit 8 Bedwas Business Centre Bedwas House Industrial Estate Bedwas Caerphilly CF83 8DU

Construct external 3-metre smoking and vaping shelter

Full Application Caerphilly 9 Jun 2026
26/0398/HH 9 Jun 2026 Awaiting decision

90 Heol Tasker Nelson Treharris CF46 6JB

Erect two-storey side extension with associated external works

Householder Application Caerphilly 9 Jun 2026
26/0383/HH 2 Jun 2026 Awaiting decision

Woodland Cottage Cwmnofydd Farm Lane Machen Caerphilly CF83 8NR

Erect two storey rear extension

Householder Application Caerphilly 2 Jun 2026
26/0384/HH 2 Jun 2026 Awaiting decision

2 Ashgrove Hengoed CF82 7JN

Erect two storey rear extension

Householder Application Caerphilly 2 Jun 2026
26/0391/RET 2 Jun 2026 Awaiting decision

27 Addison Street Cefn Fforest Blackwood NP12 1EN

Retain and complete new vehicle access, garden walls with railings and associated landscaping works

Retain Development Already Carried Out Caerphilly 2 Jun 2026
26/0379/HH 1 Jun 2026 Awaiting decision

9 Pencoed Avenue Cefn Fforest Blackwood NP12 3LD

Erect a single storey flat roof rear extension

Householder Application Caerphilly 1 Jun 2026
26/0380/CLPU 1 Jun 2026 Awaiting decision

Land Adjacent To 55 Hill View Pontllanfraith Blackwood NP12 2EL

Obtain Certificate of Lawfulness to remove part of the grass verge for installation of dropped kerb and tarmac vehicular crossing to gain access to ex...

Certificate Lawful Proposed Use/Dev Caerphilly 1 Jun 2026
26/0378/HH 29 May 2026 Awaiting decision

12 Glyn Derwen Llanbradach Caerphilly CF83 3PQ

Erect rear extension to first floor and extend front first floor dormer to bedroom

Householder Application Caerphilly 29 May 2026
26/0373/HH 26 May 2026 Awaiting decision

3 Princes Court Ynysddu Newport NP11 7LJ

Construct single storey steel and glass balcony

Householder Application Caerphilly 26 May 2026
26/0375/CLPU 26 May 2026 Decided

6 Bedwellty Road Cefn Fforest Blackwood NP12 3HF

Obtain a Lawful Development Certificate for proposed single storey side extension and form a vehicle access

Certificate Lawful Proposed Use/Dev Caerphilly 26 May 2026
26/0367/HH 21 May 2026 Awaiting decision

1 Ashgrove Terrace Nelson Treharris CF46 6LR

Erect a single storey side extension and associated works including 2m boundary fence

Householder Application Caerphilly 21 May 2026
26/0354/HH 21 May 2026 Awaiting decision

17 Coronation Crescent Pantside Newport NP11 5DJ

Extend existing driveway and build new pathway to bungalow, build new walls take down existing wall and put in eco drains

Householder Application Caerphilly 21 May 2026
26/0351/HH 20 May 2026 Awaiting decision

Redbrook Newport Road Machen Caerphilly CF83 8RA

Replace existing Chainlink boundary fence with 1800mm Timber fence

Householder Application Caerphilly 20 May 2026
26/0368/HH 20 May 2026 Awaiting decision

15 Rowan Close Nelson Treharris CF46 6EN

Erect two storey rear extension and side garage extension

Householder Application Caerphilly 20 May 2026
26/0357/HH 19 May 2026 Awaiting decision

Fairbank Park Lane Tredomen Hengoed CF82 7BX

Replace existing profiled sheeting flat roof on garage with new pitched roof with recessed integrated solar panels

Householder Application Caerphilly 19 May 2026
26/0349/HH 18 May 2026 Awaiting decision

Cwm Farm Blackbrook Road Caerphilly CF83 1NF

Erect two storey side extension

Householder Application Caerphilly 18 May 2026
26/0339/FULL 15 May 2026 Decided

53 Shingrig Road Nelson Treharris CF46 6DY

Erect fire escape staircase and associated internal alterations

Full Application Caerphilly 15 May 2026
26/0346/CLPU 14 May 2026 Awaiting decision

91 St Anne's Gardens Maesycwmmer Hengoed CF82 7QQ

Obtain a Lawful Development Certificate for proposed single storey rear extension

Certificate Lawful Proposed Use/Dev Caerphilly 14 May 2026
26/0345/CLPU 13 May 2026 Awaiting decision

2 Corbett Crescent Caerphilly CF83 1HP

Obtain a Lawful Development Certificate for proposed attic conversion

Certificate Lawful Proposed Use/Dev Caerphilly 13 May 2026
26/0336/HH 11 May 2026 Decided

1 Plynlimon Avenue Croespenmaen Newport NP11 3GR

Erect two storey extension

Householder Application Caerphilly 11 May 2026
26/0319/HH 6 May 2026 Decided

Springfield Penrhiw Lane Machen Caerphilly CF83 8RQ

Erect side extension and alterations to existing roof

Householder Application Caerphilly 6 May 2026
26/0317/HH 5 May 2026 Awaiting decision

Newlyn House Lon Pennant Cwmgelli Blackwood NP12 1BR

Erect 2 no. garages and workshop

Householder Application Caerphilly 5 May 2026
26/0323/CLPU 1 May 2026 Decided

Penbeili Farm Tydu Road Nelson Treharris CF46 6PH

Obtain a Lawful Development Certificate for proposed side extension, rear extension(s), and a hip to gable roof alteration

Certificate Lawful Proposed Use/Dev Caerphilly 1 May 2026
26/0324/CLPU 1 May 2026 Decided

Ty Rhos Waunwaelod Way Caerphilly CF83 1BD

Obtain a Lawful Development Certificate for proposed side extension, rear extension, and ancillary domestic outbuilding

Certificate Lawful Proposed Use/Dev Caerphilly 1 May 2026
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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 — taller, larger, 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 with objections) 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.