House extensions in Monmouthshire

Monmouthshire received 353 householder applications in the last 12 months - about 7 a week. Garage works and rear extensions are the most common. Of the 245 decided so far, 236 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 83 applications
22 Oct 2026 Pending Consideration DM/2026/01249

Rose Cottage Beacon Road Trellech Monmouthshire NP25 4PS

Demolition of existing single storey structures. Construction of new 2 storey side extension and dormer enlargement to bathroom.

Householder Monmouthshire
21 Oct 2026 Pending Consideration DM/2026/01257

Bridge Cottage Glynwood Lane Chapel Hill Tintern NP16 6TH

Extend front porch either side of existing, replacing existing glass roof with a fully insulated tile roof to match existing house. To take down stone...

Fast Track Householder Monmouthshire
20 Oct 2026 Pending Consideration DM/2026/01248

38 North Street Abergavenny Monmouthshire NP7 7ED

Demolition of existing relatively recent single storey extension and upvc conservatory and construction of two storey extension to the rear to provide...

Householder Monmouthshire
14 Oct 2026 Pending Consideration DM/2026/01187

The Knoll Monmouth Road Usk Monmouthshire NP15 1SF

Removal of existing roadside hedge and erection of reclaimed brick boundary wall with stone coping, replacement vehicular entrance with piers and gate...

Fast Track Householder Monmouthshire
13 Oct 2026 Pending Consideration DM/2026/01189

35 Leechpool Holdings Portskewett Monmouthshire NP26 5TZ

Proposed two storey side extension.

Householder Monmouthshire
13 Oct 2026 Pending Consideration DM/2026/01149

Property Known As Oxpool Barn Argoed Road Earlswood Shirenewton Monmouthshire

Retention of a 2.9 x 1.8m monopitch timber shed housing borehole and solar equipment

Householder Monmouthshire
13 Oct 2026 Pending Consideration DM/2026/01207

Lower Grove Grove Road Newcastle NP25 5NT

Proposed modest link extension to connect annex to main dwelling and associated works.

Householder Monmouthshire
12 Oct 2026 Pending Consideration DM/2026/01225

The Perrogs Road From Mitchel Troy Road To Penrhos Road Cwmcarfon NP25 4PL

Householder planning permission for single-storey rear extension and single-storey side extension, with extension to the entrance, internal alteration...

Householder Monmouthshire
12 Oct 2026 Pending Consideration DM/2026/01133

Golden Hill Farm Itton Road St Arvans Monmouthshire NP16 6DL

Small lean to on the side of an existing agricultural steel framed building.

Planning Permission Monmouthshire
9 Oct 2026 Pending Consideration DM/2026/01199

4 Woodbine Gardens Magor Monmouthshire NP26 3EZ

Seeking permission to put up a fence for privacy and noise reduction from the road on my property.

Householder Monmouthshire
8 Oct 2026 Pending Consideration DM/2026/01221

22-25 St Andrews Crescent Abergavenny Monmouthshire NP7 6HL

Proposed block of 4no. storage sheds of serve existing flats

Planning Permission Monmouthshire
8 Oct 2026 Approved 20 Oct DM/2026/01215

18 Holywell Road Abergavenny Monmouthshire NP7 5LR

NMA ref DM/2025/01353 Replacing existing conservatory and utility room with garden room and shower/utility room.

Non Material Amendment Monmouthshire
8 Oct 2026 Pending Consideration DM/2026/01214

Broadlands Llantilio Crossenny Village Thoroughfare Llantilio Crossenny Monmouthshire NP7 8SU

New porch, external render, cladding, garage doors and entrance gate/ boundary treatment.

Householder Monmouthshire
8 Oct 2026 Pending Consideration DM/2026/01174

New Mills Farm Hoop Road To Pilstone House Whitebrook Monmouthshire NP25 4TY

In-ground swimming pool and associated canopy/pump cabin as replacement to existing above ground swimming pool.

Householder Monmouthshire
8 Oct 2026 Pending Consideration DM/2026/01206

Yew Tree Cottage Cefn Coed Bach Kingcoed Monmouthshire NP15 1DS

Single storey rear extension.

Householder Monmouthshire
8 Oct 2026 Pending Consideration DM/2026/01026

Nationwide Abergavenny 21 High Street Abergavenny Monmouthshire NP7 5YN

Facade, roof and internal remedial repairs to the entire building, following property survey.

Listed Building Consent Heritage Monmouthshire
6 Oct 2026 Approved 7 Oct DM/2026/01185

24 Coopers Way Llanfoist Monmouthshire NP7 9LZ

A single story rear house extension

Certificate of Prop Lawful Use or Dev Monmouthshire
2 Oct 2026 Pending Consideration DM/2026/01197

Far Barn Glen Farm To Ruthlin Mill St Maughans Monmouthshire NP25 5QQ

Single storey extension to create orangery to rear of property

Certificate of Prop Lawful Use or Dev Monmouthshire
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
30 Sept 2026 Approved 22 Oct DM/2025/01410

Wainfield Cottage Wainfield Lane Gwehelog NP15 1RG

Proposed ground and first floor extension to provide additional living accommodation.

Householder Monmouthshire
24 Sept 2026 Pending Consideration DM/2026/01125

The Old Vicarage Llanover Road Llanover Monmouthshire NP7 9BY

Single storey detached garden building to be used as home gym.

Householder Monmouthshire
24 Sept 2026 Approved 9 Oct DM/2026/01134

Caldicot Leisure Centre Mill Lane Caldicot Monmouthshire NP26 4BN

The extension and alteration of the existing leisure centre to provide new and improved leisure opportunities. Building facade alterations. Additional...

Non Material Amendment Monmouthshire
24 Sept 2026 Pending Consideration DM/2026/00934

Ynys Hafod 20 New Market Street Usk Monmouthshire NP15 1AT

Reinstatement of attic ceilings and walls following their unauthorised removal.

Listed Building Consent Heritage Monmouthshire
24 Sept 2026 Pending Consideration DM/2026/01162

Tyr Ynys Fach 3 New Cottages A472 Little Henrhiw To The Island Rhadyr Llanbadoc Monmouthshire NP15 1PY

Construction of shed at the rear of a dwelling house on retained land (retrospective).

Planning Permission Monmouthshire
24 Sept 2026 Pending Consideration DM/2026/01157

Colonels Barn Park Farm New Mill Road Whitebrook Monmouthshire NP25 4TY

Proposed demolition of former agricultural building and replacement with purpose built annexe building to provide ancillary accommodation to main dwel...

Planning Permission Monmouthshire
23 Sept 2026 Pending Consideration DM/2026/01154

19 Ridge Way Wyesham Monmouth Monmouthshire NP25 3JX

Erection of a single-storey side extension.

Householder Monmouthshire
22 Sept 2026 Pending Consideration DM/2026/01141

Sunnybank House 30 Monmouth Road Abergavenny Monmouthshire NP7 5HL

Demolition/Removal of existing garden room replacement with new.

Householder Monmouthshire
21 Sept 2026 Pending Consideration DM/2026/01145

Alma House Monmouth Road Raglan Monmouthshire NP15 2ET

Proposed conversion and single storey 'Orangery' extension to the existing detached barn, for the purposes of additional living accommodation at Alma ...

Householder Monmouthshire
21 Sept 2026 Pending Consideration DM/2026/01143

2 School Cottages Mathern Road Mathern Monmouthshire NP16 6JG

Internal ground floor alterations and single storey rear flat roof extension with master bedroom access to first floor small garden terrace.

Householder Monmouthshire
21 Sept 2026 Approved 20 Oct DM/2026/01121

13 Cwm Fagor Road Devauden Monmouthshire NP16 6PJ

Previous Planning application DM/2026/00109 Further enlargement of approved rear single storey extension to extend the full width of the house.

Non Material Amendment Monmouthshire
18 Sept 2026 Approved 28 Sep DM/2026/01135

Orchard Cottage Rockfield Road Rockfield Monmouthshire NP25 5SY

Amendment to materials on utility room (Amendment to DM/2026/00619)

Non Material Amendment Monmouthshire
18 Sept 2026 Pending Consideration DM/2026/01075

1 Cwrt Bryn Derwen Usk Monmouthshire NP15 1QN

Installation of a 5.2m wide, sliding entrance gate, together with a 1.4m high Photinia 'Red Robin' hedgerow. The proposed gate and hedgerow will form ...

Householder Monmouthshire
18 Sept 2026 Pending Consideration DM/2026/01106

10 Ash Grove Caldicot NP26 4NG

Rear single storey extension and detached garden building.

Householder Monmouthshire
16 Sept 2026 Pending Consideration DM/2026/01119

Saved Cottage Highmoor Hill Road Highmoor Hill Caerwent Monmouthshire NP26 5PF

Single-storey rear extension to the existing detached dwelling, together with internal and external alterations and the conversion of a detached domes...

Householder Monmouthshire
16 Sept 2026 Approved 14 Oct DM/2026/01092

75 Brecon Road Abergavenny Monmouthshire NP7 7RA

Replacement pool house/plant room for existing outside pool.

Householder Monmouthshire
16 Sept 2026 Decided DM/2026/01101

1 Deri Road Abergavenny Monmouthshire NP7 5SY

Single storey side extension to dwelling and existing garage.

Householder Monmouthshire
15 Sept 2026 Pending Consideration DM/2026/01117

Llanarth Court Hospital Llanarth Road Llanarth NP15 2YD

Careful and methodical dismantling of the existing bath stone balustrade and wall to the car park to enable scope of essential repair works to be comp...

Listed Building Consent Heritage Monmouthshire
15 Sept 2026 Pending Consideration DM/2026/01031

23 Church Road Caldicot Monmouthshire NP26 4HN

One/Two storey rear and side extensions containing enlarged kitchen and utility room at ground floor with additional bedroom/en suite at first floor .

Householder Monmouthshire
15 Sept 2026 Approved 26 Oct DM/2026/01094

Orchard Cottage Rockfield Road Rockfield Monmouthshire NP25 5SY

Proposed new garage and garden store with associated works.

Householder Monmouthshire
14 Sept 2026 Pending Consideration DM/2026/00797

Lea Lane Cottage Well Lane Llanfair Discoed Monmouthshire NP16 6RA

Renewal of existing boundary walling.

Householder Monmouthshire
14 Sept 2026 Pending Consideration DM/2026/01085

Coalpits Farm Crick Road Shirenewton Monmouthshire NP16 6LS

Annex to existing dwelling and annex. Improve internal layout and external appearance

Non Material Amendment Monmouthshire
14 Sept 2026 Approved 14 Oct DM/2026/01116

9 Holywell Road East Abergavenny Monmouthshire NP7 5LW

Removal of existing detached single story garage and erection of new detached garage.

Fast Track Householder Monmouthshire
11 Sept 2026 Approved 12 Oct DM/2026/01104

6 Union Road East Abergavenny NP7 5UW

Raising existing first floor walls to extend existing bathroom.

Householder Monmouthshire
10 Sept 2026 Pending Consideration DM/2026/01090

7 Wallwern Wood Bayfield Chepstow Monmouthshire NP16 5TX

Mod or Removal of Condition 3 for planning app DM/2026/00382

Mod or Removal of Condition Monmouthshire
9 Sept 2026 Approved 15 Sep DM/2026/01095

Abergavenny Museum And Castle Castle Street Abergavenny Monmouthshire NP7 5EE

An amendment to the existing outer castle wall (also the boundary wall) is proposed to accommodate a second exit from the grounds of Abergavenny Castl...

Certificate of Prop Lawful Use or Dev Monmouthshire
9 Sept 2026 Pending Consideration DM/2026/01082

4 Vernon Grove Caerwent Monmouthshire NP26 4QU

Convert garage to part of house

Certificate of Prop Lawful Use or Dev Monmouthshire
4 Sept 2026 Pending Consideration DM/2026/01056

Ground Floor Rear Store 30 Lion Street Abergavenny NP7 5NT

1. Outdoor, upcycled shipping container for a kitchen space to replace pop-up kitchen area, using a collapsible gazebo. 2. Change of use for the 1st f...

Planning Permission Monmouthshire
4 Sept 2026 Approved 15 Oct DM/2026/01079

6 Wyndham Road Abergavenny Monmouthshire NP7 6AF

Proposed two storey extension over existing single storey lean too to create large kitchen living space and master bedroom with associated works.

Householder Monmouthshire
4 Sept 2026 Pending Consideration DM/2026/01013

Steppes Cottage Bryngwyn Road Jingle Street Wonastow Monmouthshire NP25 4DL

Minor change of land levels (terracing) at rear of cottage to provide for remedial works to stop water ingress into dwelling and prevent land slippage...

Planning Permission Monmouthshire
3 Sept 2026 Approved 6 Oct DM/2026/01073

Maes Coed 6 Black Bear Close Bettws Newydd Monmouthshire NP15 1EQ

Proposed replacement home office being single storey extension and associated works.

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

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