House extensions in West Northamptonshire

West Northamptonshire received 304 householder applications in the last 12 months - about 6 a week. Rear extensions and garage works are the most common. Of the 11 decided so far, 10 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

174 last 90 days
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57 last 30 days
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20 last 14 days

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Showing 50 of 174 applications
2026/2670/FULL 2 days ago Pending

Manor Farm Bridle Road Hannington NN6 9SY

Conversion and extension of existing domestic outbuilding to create a new 3-bedroom Dwelling

West Northamptonshire
2026/2699/HH 9 Jul 2026 Pending

8 Hertford Court Northampton NN3 9TD

Single storey side and rear extension. Changing roof over garage and porch from a flat roof to a pitched roof.

West Northamptonshire 9 Jul 2026
2026/2460/HH 8 Jul 2026 Pending

3 Stradlers Close Northampton NN4 6JE

Erection of summer house in rear garden - retrospective

West Northamptonshire 8 Jul 2026
2026/2610/HH 8 Jul 2026 Pending

124 Windingbrook Lane Northampton NN4 0XN

Rear first floor extension over dining room

West Northamptonshire 8 Jul 2026
2026/2684/HH 8 Jul 2026 Pending

8 Springwood Court Northampton NN3 8QN

Proposed single storey wrap around

West Northamptonshire 8 Jul 2026
2026/2666/FULL 6 Jul 2026 Pending

Mountfield High Street Culworth OX17 2BE

Variation to previously approved Appl. Ref 2023/6001/FUL Reposition reduced size Oak frame and timber clad car shelter

West Northamptonshire 6 Jul 2026
2026/2485/HH 3 Jul 2026 Pending

4 Swallow Close Northampton NN4 0QL

Single-storey rear garage extension. Garage to be converted under approved application 2026/1548/LDP.

West Northamptonshire 3 Jul 2026
2026/2549/PNHPD 3 Jul 2026 Pending

3 Greenside Blisworth NN7 3BY

Determination as to whether prior approval is required (under Schedule 2, Part 1, Class A of the above Order) for proposed rear extension extending 4m...

West Northamptonshire 3 Jul 2026
2025/5144/MAF 2 Jul 2026 Pending

123 Wellingborough Road Northampton NN1 4DL

Demolition of existing single storey building and construction of new mixed use building, with 2 no retail shops (use class E), and 10 no. residential...

West Northamptonshire 2 Jul 2026
2026/2616/HH 1 Jul 2026 Pending

2 Home Farm Close Creaton NN6 8NE

New fence and hedgerow (hedgerow planted in front of the proposed fence line) retrospective

West Northamptonshire 1 Jul 2026
2026/2662/PA 1 Jul 2026 Pending

79 The Briar Northampton NN4 8SR

Seeking prior approval [under Schedule 2, Part 1, Class A of the above order] for a larger home extension 5m x 3.30m x 2.85m to the rear

West Northamptonshire 1 Jul 2026
2026/2623/LDP 1 Jul 2026 Pending

3 Blenheim Old Stratford MK19 6FN

Certificate of Lawfulness for proposed development comprising of a loft conversion.

West Northamptonshire 1 Jul 2026
2026/2101/FULL 30 Jun 2026 Pending

Rainsbrook, 8 Independent Street, Kilsby, CV23 8XL

Demolition of existing rear conservatory and construction of a single-storey rear extension with flat roof and rooflight, together with a front entran...

West Northamptonshire 30 Jun 2026
2026/2584/HH 30 Jun 2026 Pending

24 Washington Street Northampton NN2 6NL

Proposed loft conversion with dormer to rear and roof light to front (part retrospective)

West Northamptonshire 30 Jun 2026
2026/2586/HH 30 Jun 2026 Pending

26 Chase Park Road Yardley Hastings NN7 1HD

New dormer windows, rear extension, internal alterations & glazed gable to garage

West Northamptonshire 30 Jun 2026
2026/2444/HH 30 Jun 2026 Pending

Beech House, Overthorpe Road, Overthorpe, OX17 2AE

Proposed artist studio/workshop, single bedroom holiday let (retrospective), gardeners welfare WC and garden store with associated internal and extern...

West Northamptonshire 30 Jun 2026
2026/2609/HH 30 Jun 2026 Pending

68 Booth Lane South Northampton NN3 3EP

Dropped kerb

West Northamptonshire 30 Jun 2026
2026/2120/FULL 30 Jun 2026 Pending

123 Kenmuir Avenue Northampton NN2 7EW

Formation of new dropped kerb

West Northamptonshire 30 Jun 2026
2026/2725/HH 30 Jun 2026 Pending

The Old Forge House Church Street Sulgrave OX17 2RP

Replacement windows timber to PVCu

West Northamptonshire 30 Jun 2026
2026/2457/HH 29 Jun 2026 Pending

7 Tall Trees Close Northampton NN4 9XZ

Garage Conversion and first floor Side Dormer Loft Conversion

West Northamptonshire 29 Jun 2026
2026/2557/HH 25 Jun 2026 Pending

70 Glebe Road Boughton NN2 8ET

Two storey part single storey rear extension

West Northamptonshire 25 Jun 2026
2026/2559/HH 25 Jun 2026 Pending

North Lodge, Haselbech Hill, Haselbech NN6 9LL

Proposed two storey side extension, single storey rear extension, internal and external works to existing dwelling. Erection of detached garage with g...

West Northamptonshire 25 Jun 2026
2026/2548/PNHPD 24 Jun 2026 Pending

14 Eldean Road Northampton NN5 6RF

Determination as to whether prior approval is required (under Schedule 2, Part 1, Class A of the above Order) for proposed single storey rear extensio...

West Northamptonshire 24 Jun 2026
2026/2500/HH 24 Jun 2026 Pending

Woodbine Burcote Road Towcester NN12 6JW

Proposed two-storey side extension and single-storey rear extension.

West Northamptonshire 24 Jun 2026
2026/2374/HH 24 Jun 2026 Pending

Marbilla 30 High Street Yelvertoft NN6 6LG

Erection of a 2 storey rear extension.

West Northamptonshire 24 Jun 2026
2026/2372/HH 23 Jun 2026 Pending

37 Fishers Close Northampton NN3 9SR

Single storey front porch extension

West Northamptonshire 23 Jun 2026
2026/1644/FULL 23 Jun 2026 Pending

Peachfield Kettering Road Walgrave NN6 9PH

Proposed window to the first floor bedroom (which has no natural light).

West Northamptonshire 23 Jun 2026
2026/2302/HH 23 Jun 2026 Pending

170 Welford Road Northampton NN2 8AL

First floor front and side extension

West Northamptonshire 23 Jun 2026
2026/2536/HH 23 Jun 2026 Pending

59 Charnwood Avenue Northampton NN3 3EE

Single storey rear extension

West Northamptonshire 23 Jun 2026
2026/2295/LDP 23 Jun 2026 Pending

6 Boothville Green Northampton NN3 6JR

Lawful development certificate (proposed) for installation of outdoor seating and freestanding pergola structures

West Northamptonshire 23 Jun 2026
2026/2349/HH 23 Jun 2026 Pending

45 Whitefield Road Northampton NN5 6SJ

Two storey side and front extension

West Northamptonshire 23 Jun 2026
2026/2426/FULL 22 Jun 2026 Pending

Brookmeadow Barn, Kelmarsh Road, Arthingworth

Conversion of an existing barn and extensions to form a self-build dwelling, erection of a car port, emergency pedestrian access and associated landsc...

West Northamptonshire 22 Jun 2026
2026/2486/HH 22 Jun 2026 Pending

Duck Cottage 15 Duck End Hinton In The Hedges NN13 5NF

Increase height of existing chimney from 1.2m above thatch to 1.8m using reclaimed red bricks to match existing, and install new terracotta chimney po...

West Northamptonshire 22 Jun 2026
2026/2257/HH 19 Jun 2026 Pending

16 High Street Harpole NN7 4DH

First floor side extension and single storey rear extension

West Northamptonshire 19 Jun 2026
2026/2488/HH 19 Jun 2026 Pending

15 Valley Road Brackley NN13 7DQ

Demolition of existing single storey rear extension, construction of single storey rear extension and new side window

West Northamptonshire 19 Jun 2026
2026/2571/NMA 19 Jun 2026 Pending

Land North Of Old Farm Lane Ashton

The application seeks approval for a series of minor, non-material amendments to the approved scheme: 1. Change of vehicle access surface from tarmac ...

West Northamptonshire 19 Jun 2026
2026/2103/FULL 18 Jun 2026 Pending

Hollytree House 11 High Street Moulton NN3 7SR

Replacement of sash windows on the front elevation and the installation of 3 new porch windows with heritage uPVC.

West Northamptonshire 18 Jun 2026
2026/2474/FULL 18 Jun 2026 Pending

Preschool West Haddon Endowed Church Of England Primary School The Green West Haddon NN6 7AN

Single storey rear extension.

West Northamptonshire 18 Jun 2026
2026/2633/HH 18 Jun 2026 Pending

Meryl Cottage 65 Duston Road Upper Harlestone NN7 4EH

Erection of summer house

West Northamptonshire 18 Jun 2026
2026/2373/HH 18 Jun 2026 Pending

49 East Park Parade Northampton NN1 4LA

Demolition and replacement of four single garages with two double garages

West Northamptonshire 18 Jun 2026
2026/2657/HH 18 Jun 2026 Pending

34 Stratton Drive Brackley NN13 6HE

Proposed 2m high fence to side of property.

West Northamptonshire 18 Jun 2026
2026/2017/FULL 17 Jun 2026 Pending

76 Puxley Road Deanshanger MK19 6LW

Single storey front extension

West Northamptonshire 17 Jun 2026
2026/2470/HH 17 Jun 2026 Pending

Sharman 64 Brixworth Road Creaton NN6 8NQ

Proposed front two storey extension

West Northamptonshire 17 Jun 2026
2026/2615/HH 17 Jun 2026 Pending

47 Croxden Way Daventry NN11 2PD

Erection of a partially enclosed lean-to veranda, to the rear

West Northamptonshire 17 Jun 2026
2026/2627/HH 17 Jun 2026 Pending

506 Wellingborough Road Northampton NN3 3HX

Rear Balcony extension and tree removal.

West Northamptonshire 17 Jun 2026
2026/2625/LDP 17 Jun 2026 Pending

The Lodge Cottage Castle Ashby Road Whiston NN7 1NN

Preposed detached single storey garage.

West Northamptonshire 17 Jun 2026
2026/2178/FULL 16 Jun 2026 Pending

Brook House Little Horton House Drive Horton NN7 2BB

Alteration to rear roof slope, enlargement of a rear dormer, and erection of first-floor rear balcony (and associated works).

West Northamptonshire 16 Jun 2026
2026/2380/LDP 16 Jun 2026 Approval

50 St Johns Avenue Northampton NN2 8RU

Lawful development certificate (proposed) for construction of single storey garden room

West Northamptonshire 16 Jun 2026
2026/2433/HH 16 Jun 2026 Pending

42 Shard Close Northampton NN4 0SE

Demolition of garage and conservatory and construction of two storey side extension and single storey rear extension

West Northamptonshire 16 Jun 2026
2026/2612/HH 16 Jun 2026 Pending

2 The Croft Northampton NN5 7HR

Replacement windows and doors.

West Northamptonshire 16 Jun 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 West Northamptonshire?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by West Northamptonshire. You can also narrow the alert to a postcode, street, or drawn area.

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