House extensions in Merthyr Tydfil

Merthyr Tydfil received 85 householder applications in the last 12 months. Rear extensions and garage works are the most common. Of the 63 decided so far, 60 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 18 of 18 applications
21 Oct 2026 Unknown P/26/0234

57 Fell Street Treharris CF46 5HN

Erection of conservatory to rear elevation

Full Merthyr Tydfil
15 Oct 2026 Unknown P/26/0229

Mill House Millfield Quakers Yard Treharris CF46 5LD

Proposed Replacement Conservatory/Garden Room, First-Floor En-Suite Extension and Associated Alterations

Certificate of Lawfulness Merthyr Tydfil
13 Oct 2026 Unknown P/26/0226

11 Tyntaldwyn Road Troedyrhiw Merthyr Tydfil CF48 4NG

Create front parking area with associated ground re-profiling works

Full Merthyr Tydfil
8 Oct 2026 Unknown P/26/0223

29 Andrews Close Heolgerrig Merthyr Tydfil CF48 1SS

Proposed first floor rear extension and garden room

Full Merthyr Tydfil
6 Oct 2026 Unknown P/26/0222

1 Milbourne Close Twynyrodyn Merthyr Tydfil CF47 0UH

Rear dormer extension

Full Merthyr Tydfil
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
29 Sept 2026 Unknown P/26/0213

22 Williamstown Merthyr Tydfil CF47 8PD

Demolish existing garage and shed and construct new detached garage

Full Merthyr Tydfil
23 Sept 2026 Unknown P/26/0176

36 Berry Square Dowlais Merthyr Tydfil CF48 3AL

Erection of two storey side extension, and the repositioning of parking area and vehicular entrance.

Full Merthyr Tydfil
19 Sept 2026 Approved 15 Oct P/26/0185

Travel Inn Duffryn Road Pentrebach Merthyr Tydfil CF48 4BB

Provision of Bin Store and repositioning of cycle store/hoops.

Full Merthyr Tydfil
17 Sept 2026 Unknown P/26/0204

Park View Bungalow Penyard Road Merthyr Tydfil CF47 0HL

New detached garage and store

Full Merthyr Tydfil
14 Sept 2026 Approved 21 Oct P/26/0161

Cefn Fforest Farm Twynygarreg Treharris CF46 5RN

Lawful Development Certificate for proposed assorted extensions and works

Certificate of Lawfulness Merthyr Tydfil
9 Sept 2026 Approved 22 Oct P/26/0199

Deepdene Brewery Lane Cefn Coed Merthyr Tydfil CF48 2LP

Construct single storey extension to the side of the property

Full Merthyr Tydfil
9 Sept 2026 Unknown P/26/0196

12 Fairview Terrace Twynyrodyn Merthyr Tydfil CF47 0RL

Rear infill single storey extension, raise existing rear extension roof, and new doors to side elevation. Construction of detached garden room.

Full Merthyr Tydfil
2 Sept 2026 Unknown P/26/0191

6 Holford Street Cefn Coed Merthyr Tydfil CF48 2RN

First Floor Extension above existing ground floor extension.

Full Merthyr Tydfil
2 Sept 2026 Approved 2 Oct P/26/0190

1 St Marys Close Merthyr Tydfil CF47 8YS

Erect a storm porch to front elevation and replacement of roof over study area

Full Merthyr Tydfil
20 Aug 2026 Approved 9 Sep P/26/0138

Ffostyll 18 The Hawthorns Pant Merthyr Tydfil CF48 2EJ

Demolish existing conservatory and construct a single storey rear extensions

Full Merthyr Tydfil
11 Aug 2026 Approved 2 Oct P/26/0180

St Marys Roman Catholic Primary School Caedraw Road Merthyr Tydfil CF47 8HA

Widen existing vehicular access off Caedraw Road

Full Merthyr Tydfil
29 Jul 2026 Approved 22 Sep P/26/0173

148 High Street Merthyr Tydfil CF47 8DP

Vary of Condition 2 of planning permission P/24/0206 to allow for the increased depth of the rear extension to enable the incorporation of an internal...

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

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