21 Belfry Lane Northampton NN4 0PB Data via plota.co.uk

2026/0256/FULL - Full Planning Permission Approved
Extensions & alterations

Proposal

Two storey and single storey rear extension. New rear dormer. Internal alterations. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
9 Jan 2026
✓
Approved
18 Mar 2026

Approved on 18 Mar 2026 · Delegated · Last checked 12 Sept 2026

Documents 8

Decision & officer reports 1

PDF Decision Notice Document · 18 Mar 2026 View ↗

Plans & drawings 3

PDF Plan - General (Existing) Document · 9 Jan 2026 View ↗ PDF Plan - General (Proposed) Document · 9 Jan 2026 View ↗ PDF Plan - Location and Block Plan Document · 9 Jan 2026 View ↗

Application forms 2

PDF CIL Form 1 Additional Information Document · 9 Jan 2026 View ↗ PDF Application Form (PUBLIC) Document · 9 Jan 2026 View ↗

Other documents 2

PDF Officers Report Document · 18 Mar 2026 View ↗ PDF Acknowledgement Document · 28 Jan 2026 View ↗

All documents on the council site ↗

Site constraints 5

Flood zone 2, rivers and sea
Medium chance: between a 1 in 100 and 1 in 1,000 annual chance from rivers, or 1 in 200 to 1 in 1,000 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
Agricultural land, grade 3a
Best and most versatile land (grades 1, 2 and 3a). Source: the Predictive Agricultural Land Classification Map (Defra and Natural England, 2025; the Welsh Government's Predictive ALC Map 2 in Wales), a model rather than a site survey. Natural England's Provisional ALC map (1:250,000, 1970s) agrees.
Where development of farmland is needed, policy prefers poorer land over the best and most versatile (grades 1, 2 and 3a). Three sources: Natural England's post-1988 field surveys, which are definitive where they exist; the Defra predictive map for England (2025) and the Welsh Government predictive map, modelled from the soil map with 3a and 3b split; and the 1970s provisional map, which planners and other services still show, coarser and with grade 3 undivided. Where the provisional and predicted grades disagree, treat the predicted grade as the current estimate and expect an application to carry its own survey.
Radon affected area, class 5
An estimated 10 to 30% of homes reach the radon action level. Indicative for the 1 km square, which takes the highest class found in it; a radon test gives the answer for a building.
From the British Geological Survey and UK Health Security Agency indicative atlas. Under building regulations, as the BRE guide BR 211 (2023) sets out, new buildings and extensions need basic radon protection from class 3 in England and Wales and from class 2 in Scotland, and full protection from class 5. The class at the site itself, from the detailed BGS map, decides which.
UKHSA radon ↗
Also on the record
Nature improvement area: Nene Valley; National infrastructure project about 1986 m away: Northampton Gateway Rail Freight Interchange.
Not affected
Not green belt · No scheduled monument at the site

Checked on 6 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

Sales history 2

Last sold for £755,000 in August 2018. Detached house, freehold.

14 August 2018£755,000
27 March 1998£267,000New build

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area299 m² (3,218 sq ft)
Energy ratingD (55 out of 100)
PropertyDetached house, 10 habitable rooms
Built1991 to 1995
HeatingBoiler and radiators, mains gas
WallsCavity wall, as built, insulated (assumed)

From the energy performance certificate lodged in January 2009, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate

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Other new applications on this street

20 May 2026Pending

Phase 2b (Residential) Land West of Windingbrook Lane and South of Rowtree Road Northampton NN4 0PB

Discharge of Condition 10 (CEMP) for Phase 2b of Planning Permission WNN/2023/06...

2026/2270/COND

Important details

Council
West Northamptonshire
Application type
Full Planning Permission
Postcode
NN4 0PB
Received
9 Jan 2026
Validated
9 Jan 2026
Ward
Hunsbury Ward
Parish
Collingtree Parish Council
Target decision
20 Mar 2026
Decision
Approval
Decision date
18 Mar 2026
Decision level
Delegated

How this decision compares

Decided in 68 days from validation, 6 days faster than West Northamptonshire's median of 74 for extensions. Approved, as 92% of extensions here are.

28%decided within 8 weeks
92%approved
712decided in the last year

Plota live figures for extensions decided by West Northamptonshire in the last twelve months, from validation. West Northamptonshire decision record →

Consultation & key dates

Comments by
22 Feb 2026

Historical activity at this location

23 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025 Approved
27 Belfry Lane, Northampton, NN4 0PB
Double storey side and front extension and erection of outbuilding to rear garden
2025/4379/FULL
2025 Approved
18 Belfry Lane Northampton NN4 0PB
Variation of condition 2 Plans - Increase footprint, two similar gables on rear elevation…
2025/4637/S73
2025 Approved
32 Belfry Lane, Northampton, NN4 0PB
Rear extension to create room in the roof space
2025/2034/FULL
2025 Approved
18 Belfry Lane Northampton NN4 0PB
Variation of Conditions 2 [Plans] & 3 [Appearance] to amend internal layout, external wal…
2025/3245/S73
2024 Approved
18 Belfry Lane, Northampton, NN4 0PB
Convert existing bungalow into new two storey house with additional rooms in the roof.
2024/2234/FULL
2022 Approved
18 Belfry Lane, Northampton, NN4 0PB
Outline Planning Application (with some matters reserved) for demolition of existing dwel…
WNN/2022/1070
2022 Approved
19 Belfry Lane Northampton Northamptonshire NN4 0PB
2no single storey rear extensions
WNN/2022/0332
2021 Approved
22 Belfry Lane Northampton Northamptonshire NN4 0PB
Non Material Amendment to Planning Permission WNN/2021/0210 (Two storey rear and side ext…
WNN/2021/0813
2021 Approved
22 Belfry Lane, Northampton, NN4 0PB
Two storey rear and side extension, remodelling external face of property with internal r…
WNN/2021/0210
2020 Refused
32 Belfry Lane Northampton Northamptonshire NN4 0PB
Two storey front extension
N/2020/0431
2020 Approved
30 Belfry Lane Northampton Northamptonshire NN4 0PB
First floor side extension above existing double garage
N/2020/0367
2018 Approved
10 Belfry Lane, Northampton, NN4 0PB
Two storey rear extension and creation of balcony with balustrade and side glazed panel o…
N/2018/1456
2018 Approved
23 Belfry Lane, Northampton, NN4 0PB
Construction of balcony and first floor extension (Retrospective) (Amendment of N/2017/08…
N/2018/0642
2018 Approved
36 Belfry Lane Northampton Northamptonshire NN4 0PB
Alteration of existing hipped roof line to form gable end to facilitate dressing area
N/2018/0285
2018 Approved
16 Belfry Lane, Northampton, NN4 0PB
Part double/part single storey side and rear extension and rear dormer (Part Retrospectiv…
N/2018/0137
2017 Approved
32 Belfry Lane, Northampton, NN4 0PB
Single storey side extension
N/2017/1206
2017 Approved
23 Belfry Lane, Northampton, NN4 0PB
Demolition of existing conservatory and construction of new two storey rear extension wit…
N/2017/0886
2016 Approved
2 Belfry Lane, Northampton, NN4 0PB
First floor extension to side, two storey extension to rear & new entrance porch
N/2016/1432
2016 Approved
20 Belfry Lane, Northampton, NN4 0PB
Proposed replacement swimming pool enclosure (part retrospective)
N/2016/1144
2016 Approved
16 Belfry Lane, Northampton, NN4 0PB
Part double / single storey side and rear extension.
N/2016/0908
2016 Refused
20 Belfry Lane, Northampton, NN4 0PB
Replacement swimming pool enclosure with terrace over.
N/2016/0679
2016 Approved
10 Belfry Lane, Northampton, NN4 0PB
Non- material amendment to Planning Permission N/2015/0310 (Two storey rear extension to…
N/2016/0750
2016 Approved
36 Belfry Lane, Northampton, NN4 0PB
Alterations to first floor over garage to facilitate conversion to residential annexe.
N/2016/0132
West Northamptonshire
Planning Authority Score
1.7/10
Poor
#280 of 296 councils
Relevant to this application:
Householder decisions

West Northamptonshire is one of the slowest councils in England for householder decisions, ranking #295 out of 296. The council extends the time limit on 79% of applications - one of the highest rates in England. Expect your application to take longer than the standard deadline. Householder applications are slightly more likely to be approved here (93%) than the national average (90%).

Among the slowest councils in England
for householder decisions
These figures are council-wide context, not a prediction for this application. View full council performance
West Northamptonshire decision statistics
Based on MHCLG data, the year to March 2026
90%
Overall approval rate
Above avg (87%) #123 of 296
93%
Householder approved
Above avg (90%) #144 of 296
18%
Decided in 8 weeks
Below avg (63%) #295 of 296
79%
Extended time limit
Above avg (41%) #295 of 296
81%
Minor dwellings approved
170 decided (1-9 homes)
83%
Major dwellings approved
24 decided (10+ homes)
86%
Change of use approved
207 decided
1,832
Total decisions
179 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.