House extensions in Monmouthshire

Monmouthshire received 274 householder applications in the last 12 months - about 5 a week. Garage works and rear extensions are the most common. Of the 179 decided so far, 173 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 87 applications
Yesterday Pending Consideration DM/2026/01090

7 Wallwern Wood Bayfield Chepstow Monmouthshire NP16 5TX

In relation to a single storey front extension to existing dwelling. Application submitted to remove conditions associated with not permitting the dis...

Mod or Removal of Condition Monmouthshire
2 days ago 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/2026/01013

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
2 Sept 2026 Pending Consideration DM/2026/01062

12 Mill Street Usk NP15 1AN

Provision of first floor accommodation over an existing rear single storey extension to a terraced house.

Householder Monmouthshire
1 Sept 2026 Pending Consideration DM/2026/01066

6 Charles Road Dingestow Monmouthshire NP25 4BY

Alteration to proposed two storey extension.

Non Material Amendment Monmouthshire
28 Aug 2026 Pending Consideration DM/2026/01051

10 Parklands Penperlleni Goytre Monmouthshire NP4 0BB

Retention of boundary treatment to rear of 10 Parklands

Householder Monmouthshire
26 Aug 2026 Pending Consideration DM/2026/01052

12 Victoria Place Priory Street Monmouth NP25 3NX

Minor alterations to garden wall, gate and replacement of basement doors and boiler with new supply.

Listed Building Consent Heritage Monmouthshire
26 Aug 2026 Pending Consideration DM/2026/01058

Great Panta Barn Panta Farm Coal Road Devauden NP16 6SS

Single storey outbuilding in a steel frame timber clad to provide storage for external equipment, vehicles, bicycles, workshop and utility area.

Householder Monmouthshire
21 Aug 2026 Pending Consideration DM/2026/01040

1 School Cottages Mathern Road Mathern Monmouthshire NP16 6JG

Extension to current Garage structure to meet the boundary at the back and side of the current Garage. The Garage side and back will with then become ...

Householder Monmouthshire
20 Aug 2026 Pending Consideration DM/2026/01028

11 Sycamore Terrace Magor Monmouthshire NP26 3ET

Construction of a two-story side extension and modest enlargement of the existing front porch at 11 Sycamore Terrace, Magor.

Householder Monmouthshire
20 Aug 2026 Pending Consideration DM/2026/00792

Sunnybank John Smiths Lane Great Oak Bryngwyn Monmouthshire NP15 2DD

Two Storey Side Extension

Householder Monmouthshire
19 Aug 2026 Pending Consideration DM/2026/00989

8 Danybryn Llanellen Monmouthshire NP7 9HH

Outbuilding in rear garden comprising garage with family annexe above.

Householder Monmouthshire
18 Aug 2026 Pending Consideration DM/2026/01020

Jubilee Cottage Penrhos Farm To Beiliau Wood Penrhos Monmouthshire NP15 2LF

Proposed single storey side extension and first floor extension over existing side extension

Householder Monmouthshire
18 Aug 2026 Pending Consideration DM/2026/00942

The Barn Upper Farm Church Lane Llandewi Rhydderch Monmouthshire NP7 9TG

Internal alterations and alterations to fenestration.

Householder Monmouthshire
13 Aug 2026 Pending Consideration DM/2026/01008

Box Tree Cottage A48 Chepstow Garden Centre To Pwllmeyric Hill Pwllmeyric Monmouthshire NP16 6LE

Construction of a new front boundary wall with pedestrian gate and electric sliding vehicle gate.

Householder Monmouthshire
13 Aug 2026 Pending Consideration DM/2026/00827

31 Longhouse Barn Penperlleni Goytre Monmouthshire NP4 0AX

Construction of a single-storey detached ancillary residential annexe within the rear garden including demolition of existing garage

Householder Monmouthshire
12 Aug 2026 Pending Consideration DM/2026/00848

York House And Castledale Welsh Street Chepstow Monmouthshire NP16 5UW

LBC -Reroof asbestos cement tiles, battens, and underlay for non natural slate materials

Listed Building Consent Heritage Monmouthshire
11 Aug 2026 Pending Consideration DM/2026/00941

The Salvation Army Church Victoria Street Abergavenny Monmouthshire NP7 5DS

LBC - Renovation works , Strip existing roof slates and fit new breathable membrane and refit existing slates, new timber windows and doors to rear ha...

Listed Building Consent Heritage Monmouthshire
11 Aug 2026 Pending Consideration DM/2026/00938

The Rectory Usk Road Llanlowell Monmouthshire NP15 1LJ

Erection of oak framed sun/garden room.

Householder Monmouthshire
10 Aug 2026 Pending Consideration DM/2026/00947

4 Mid Summer Way Monmouth Monmouthshire NP25 5UT

Extension of garage and conversion to family annexe.

Householder Monmouthshire
6 Aug 2026 Pending Consideration DM/2026/00979

The Pentre Brecon Road Llanwenarth Monmouthshire NP7 7HA

Alterations and repairs, new extensions, reversal of modern alterations, replacement windows and forming new doorways. The application also incorporat...

Householder Monmouthshire
6 Aug 2026 Approved DM/2026/00975

Hardwick Court Bulwark Road Chepstow Monmouthshire NP16 5JE

Demolition of small garden store and erection of a detached domestic garage.

Fast Track Householder Monmouthshire
6 Aug 2026 Pending Consideration DM/2026/00981

35 St Helen's Crescent Llanellen Monmouthshire NP7 9HN

Proposed Single-Storey Kitchen Extension and Therapy Pool Outbuilding with associated works

Householder Monmouthshire
6 Aug 2026 Pending Consideration DM/2026/00954

School Bungalow Alianore Road Caldicot NP26 5DF

Construction of an enclosed shed between the existing bungalow and the neighbour's existing garage and canopy. The structure will comprise an aluminiu...

Householder Monmouthshire
5 Aug 2026 Pending Consideration DM/2026/00963

Air Craft Hanger Upper Cae Garw Farm Penrhos Road To Trellech Trellech Monmouthshire NP25 4PJ

Partial demolition, remediation and conversion of the former steel aircraft hanger to create a reduced footprint ancillary building comprising a farme...

Planning Permission Monmouthshire
5 Aug 2026 Approved DM/2026/00968

The Bungalow 11 Lansdown Road Abergavenny Monmouthshire NP7 6AN

Alterations and extension to single storey flat roofed structure at rear of dwelling.

Householder Monmouthshire
5 Aug 2026 Pending Consideration DM/2026/00967

The Blacksmiths Shop Llantilio Crossenny Village Thoroughfare Llantilio Crossenny Monmouthshire NP7 8SU

Erection of single storey rear extension including raising the roof of the existing side element of the dwelling.

Householder Monmouthshire
5 Aug 2026 Unknown DM/2026/00872

8 Cwrt Ffynnon Gybi Llangybi Monmouthshire NP15 1RF

Solar panels to rear of main roof and two pergolas in rear garden.

Householder Monmouthshire
5 Aug 2026 Pending Consideration DM/2026/00928

3 Birdwood Gardens Mathern Monmouthshire NP16 6UF

All external building operations include new foundations, external walls, roof structure, roof tiles, fascia/soffits, rainwater goods, and openings. E...

Certificate of Prop Lawful Use or Dev Monmouthshire
4 Aug 2026 Pending Consideration DM/2026/00646

1 Hook Close Monmouth Monmouthshire NP25 3BD

Proposed side and rear extension, raising of the roof to accommodate living space and associated external works including new vehicle turning head.

Householder Monmouthshire
3 Aug 2026 Approved DM/2026/00960

Coed Vir Farmhouse Llandewi Rhydderch NP7 9TU

Removal of existing sheds and erection of timber clad storage building.

Householder Monmouthshire
31 Jul 2026 Pending Consideration DM/2026/00931

Sportsman Hall Buckwell Road To Gaerllwyd Baptist Chapel Earlswood Shirenewton Monmouthshire NP16 6AR

Proposed alterations and extension to Sportsman Hall

Planning Permission Monmouthshire
31 Jul 2026 Pending Consideration DM/2026/00946

Robin Hill Back Road Catbrook Trellech NP16 6NA

Detached garage & workshop, with ancillary room in roof space.

Householder Monmouthshire
30 Jul 2026 Pending Consideration DM/2026/00927

Upper Court Farm King Road Penpergwm Monmouthshire NP7 9AS

Prior approval - Proposed new storage building.

Agric Notification Monmouthshire
29 Jul 2026 Pending Consideration DM/2026/00881

Little Folly Bluebell Road Earlswood Shirenewton NP16 6AU

Demolition of existing wooden 50M square open barn and replacement single storey ancillary annex of same footprint used for ancillary residential use.

Planning Permission Monmouthshire
28 Jul 2026 Approved DM/2026/00851

27 Chestnut Drive Abergavenny Monmouthshire NP7 5JZ

Canopy low over footpath, obscuring streetlight MB1396 and in contact with garage roof. Raise canopy over footpath and prune away from structures.

Works to trees in a Con Area Monmouthshire
27 Jul 2026 Pending Consideration DM/2026/00924

Caerwent Magna Caerwent Road Caerwent Monmouthshire NP26 5AY

The project is to redevelop the old Wash House into a Scriptorium. The Scriptorium will be a space where a library of books will be stored, a place fo...

Planning Permission Monmouthshire
27 Jul 2026 Approved DM/2026/00920

44 Newtown Road Penperlleni Goytre Monmouthshire NP4 0AW

Proposed single storey flat roof extension. Drawing nos 1843 [PL]03 and 1843 [PL]04

Certificate of Prop Lawful Use or Dev Monmouthshire
27 Jul 2026 Pending Consideration DM/2025/01510

Tandderwen Penrhos Road Penrhos Monmouthshire NP15 2LE

Extension and conversion of garage and single storey extension to dwelling to integrate converted garage into the dwelling.

Householder Monmouthshire
27 Jul 2026 Pending Consideration DM/2026/00921

Lyndhurst Whitewall Magor Monmouthshire NP26 3DD

Proposed single storey 2 bay garage and green house

Householder Monmouthshire
27 Jul 2026 Approved DM/2026/00895

1 Raglan Terrace Abergavenny Monmouthshire NP7 9SR

I would like to use our double garage for use as a habitable annexe to Main House, in order to accommodate my daughter and partner who are returning t...

Certificate of Prop Lawful Use or Dev Monmouthshire
24 Jul 2026 Approved DM/2026/00918

12 Meadway Rogiet Monmouthshire NP26 3SA

rear single storey extension to garage

Householder Monmouthshire
23 Jul 2026 Pending Consideration DM/2026/00914

Ty Newydd Coed-chambers Road Glascoed Monmouthshire NP4 0TE

Proposed conversion of redundant agricutural building with modest extension and associated works.

Planning Permission Monmouthshire
23 Jul 2026 Pending Consideration DM/2026/00540

38 Priory Gardens Usk NP15 1BB

Conversion of the existing flat-roofed garage into a habitable room, together with the replacement of the flat roof with a pitched roof and the additi...

Householder Monmouthshire
23 Jul 2026 Pending Consideration DM/2026/00884

Wentworth Red House Lane Shirenewton Monmouthshire NP16 6RL

Demolition of existing conservatory and erection of a single storey rear extension, a new Juliette balcony, cladding to existing house, porch and outb...

Householder Monmouthshire
23 Jul 2026 Pending Consideration DM/2026/00886

4 Whitehall Gardens Undy Monmouthshire NP26 3EW

Proposed single storey extension with materials to match existing house.

Certificate of Prop Lawful Use or Dev Monmouthshire
21 Jul 2026 Approved DM/2026/00744

Llandogo House Church Road Llandogo Monmouthshire NP25 4TJ

Change use of garage to become part of the kitchen. The garage is already joined to the property and acessible through an internal door. The outside o...

Certificate of Prop Lawful Use or Dev Monmouthshire
21 Jul 2026 Pending Consideration DM/2026/00764

Springfield Farm Llanwyny Road Llangovan Monmouthshire NP25 4BU

a. an entrance to the property - To reopen old gateway and create an entrance with splay at the west of Springfield Farm onto Trecastle Road. b. chang...

Planning Permission Monmouthshire
20 Jul 2026 Approved DM/2026/00889

22 Priory Gardens Usk Monmouthshire NP15 1AJ

To convert existing garage into additional living space to main house and connect to main house with new w.c. shower room/glazed link.

Householder Monmouthshire
20 Jul 2026 Pending Consideration DM/2026/00863

35 Canon Lane Caerwent Monmouthshire NP26 4QQ

Erection of a single storey rear extension to an existing dwellinghouse.

Householder Monmouthshire
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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.