158, Trelawney Avenue, Slough, SL3 8RU Data via plota.co.uk

P/12422/002 - Full Planning Approved
Extensions & alterations

Proposal

Construction of a proposed loft conversion to create habitable accommodation with rear dormer extension and 3no. rooflights to the front elevation. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
10 Jun 2026
✓
Consultation
10 Jun 2026
✓
Approved
26 Aug 2026

Approved on 26 Aug 2026 · Delegated · Last checked 27 Aug 2026

Documents

View the documents on the council's website ↗

Site constraints 2

National infrastructure project 937 m away: M4 Junctions 3 to 12 Smart Motorway
The site is 937 m from the project boundary. Highway, decided. The project page says whether consent was granted. Also within 2 km: Expansion of Heathrow Airport (Third Runway) (at pre-application, 883 m).
Nationally significant infrastructure projects (power stations, electricity lines, pipelines, major roads and railways, harbours, airports and reservoirs) are consented by a Secretary of State under the Planning Act 2008, after an examination by the Planning Inspectorate, rather than by the council. The boundary is the one the Inspectorate consults on and can change as the scheme does. Projects are shown within 2 km of the site.
Planning Inspectorate project page ↗
Also on the record
Inside the Slough built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate 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 4

Last sold for £550,000 in March 2016. Semi-detached house, freehold.

31 March 2016£550,000
29 April 2014£210,000
28 January 2003£182,000
19 December 1997£89,000

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

Building

Floor area111 m² (1,195 sq ft)
Energy ratingD (58 out of 100), could reach C
PropertySemi-detached house, 6 habitable rooms
Built1950 to 1966
HeatingBoiler and radiators, mains gas
WallsCavity wall, filled cavity

From the energy performance certificate lodged in December 2013, the latest held for this property. The building may have changed since. View the certificate

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Other new applications on this street

23 Sept 2026Pending

136, Trelawney Avenue, Slough, SL3 8RU

Lawful Development Certificate for a proposed single storey front extension, sin

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18 Sept 2026Pending

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Construction of a proposed demolition of the existing commercial units and const

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25 Aug 2026Pending

Former Police Station, Trelawney Avenue, Langley, Slough, SL3 8MF

Submission of details pursuant to condition 7 (Secured By Design), 8 (Access and...

P/08979/014
17 Aug 2026Pending

Co-operative Retail Services Ltd, 238-240, Trelawney Avenue, Slough, SL3 7UD

Construction of a rear timber canopy enclosure with a felt roof for storage purp...

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Nearby new applications

7 Oct 2026Pending

11, Ives Road, Slough, Slough, SL3 8PB

Retrospective application for the retention of a single storey rear extension bu

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7 Oct 2026Pending

25, Newton Close, Slough, SL3 8DD

The erection of a single storey rear extension, which would extend beyond the re

Y/04903/002
25 Sept 2026Pending

171, High Street, Langley, Slough, SL3 8LP

The erection of a single storey rear extension, which would extend beyond the r

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23 Sept 2026Pending

136, Trelawney Avenue, Slough, SL3 8RU

Lawful Development Certificate for a proposed single storey front extension, sin

P/21162/000
22 Sept 2026Pending

32A & 32B, Newton Close, Slough, SL3 8DD

Construction of Loft conversion with rear dormer

P/02879/013
18 Sept 2026Pending

Trelawney Industrial Court, Trelawney Avenue, Slough, Berkshire, SL3 7UJ

Construction of a proposed demolition of the existing commercial units and const

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Important details

Council
Slough
Application type
Full Planning
Postcode
SL3 8RU
Received
10 Jun 2026
Validated
10 Jun 2026
Ward
Langley Marish
Case officer
Show
Target decision
5 Aug 2026
Decision
Approved with Conditions; Informatives
Decision date
26 Aug 2026
Decision level
Delegated
Applicant
Show
Agent
GET RAPID PLANS

How this decision compares

Decided in 77 days from validation, 24 days slower than Slough's median of 53 for extensions. Approved, as 81% of extensions here are.

66%decided within 8 weeks
81%approved
460decided in the last year

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

Consultation & key dates

Alt. reference
PP-14994989
Site or press notice
10 Jun 2026
Statutory expiry
16 Sept 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Approved
43, Ryvers Road, Slough, SL3 8RZ
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/20922/001
2025 Refused
43, Ryvers Road, Slough, SL3 8RZ
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/20922/000
2025 Approved
11 & 13, Ryvers Road, Langley, SL3 8RZ
Construction of a first floor rear extensions
P/20755/000
2025
112, Trelawney Avenue, Slough, Slough, SL3 8RP
Retrospective application for front porch and single storey side extension and external m…
P/19993/004
2024 Refused
112, Trelawney Avenue, Slough, Slough, SL3 8RP
Retrospective application for single storey side and rear extension, loft dormer and outb…
P/19993/003
2024 Withdrawn
112, Trelawney Avenue, Slough, Slough, SL3 8RP
External insulation and K- Render to existing brick work to front elevation
P/19993/002
2024 Approved
11, Ryvers Road, Slough, SL3 8RZ
Lawful development certificate for a proposed loft conversion with rear dormer and 3no fr…
P/20545/001
2023 Approved
114, Churchill Road, Slough, SL3 7RB
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/20182/000
2023 Approved
116, Trelawney Avenue, Slough, SL3 8RP
Construction of a new porch following the demolition of existing porch
P/20123/000
2022 Approved
112, Trelawney Avenue, Slough, SL3 8RP
Construction of a single storey side and part rear extension
P/19993/001
2022 Approved
112, Trelawney Avenue, Slough, SL3 8RP
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/19993/000
2022 Approved
129, Churchill Road, Slough, SL3 7RD
Construction of a single storey side and rear extension.
P/19678/001
2022 Approved
152, Trelawney Avenue, Slough, SL3 8RU
Construction of a single storey side and rear extension
P/03562/003
2022 Approved
152, Churchill Road, Slough, SL3 7RB
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/19736/000
2021 Approved
152, Trelawney Avenue, Slough, SL3 8RU
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/03562/001
2021 Approved
129, Churchill Road, Slough, SL3 7RD
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/19678/000
2021 Approved
78, Churchill Road, Slough, SL3 7RB
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/19260/000
2020 Approved
138, Churchill Road, Slough, SL3 7RB
Construction of a front porch and a single storey rear extension
P/15580/001
2020 Approved
112, Churchill Road, Slough, SL3 7RB
Construction of a rear outbuilding.
P/15824/001
2019 Approved
142, Trelawney Avenue, Slough, SL3 8RU
Lawful development certificate for a proposed rear outbuilding.
P/03524/002
2017 Refused
123 & 125, Trelawney Avenue, Slough, SL3 8RG
Demolition of existing rear conservatory and construction of a two storey rear extension…
P/16159/001
2017 Approved
51, Ryvers Road, Slough, SL3 8RZ
Construction of a first floor rear extension.
P/15347/002
2016 Approved
51, Ryvers Road, Slough, SL3 8RZ
Lawful development certificate for a proposed single storey rear extension and loft conve…
P/15347/001
2016 Approved
63, Spencer Road, Slough, SL3 8RR
Lawful development certificate for a proposed loft conversion, rear dormer and front porc…
P/16495/001
2016 Approved
63, Spencer Road, Slough, SL3 8RR
The erection of a single storey rear extension, which would extend beyond the rear wall o…
Y/16495/000
Slough
Planning Authority Score
2.4/10
Poor
#260 of 296 councils
Relevant to this application:
Householder decisions

Slough is slower than most councils at deciding householder applications, ranking #263 out of 296. Slough is also one of the strictest councils - it refuses more householder applications than almost any other, with only 82% approved vs 90% nationally.

One of the strictest councils
only 82% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Slough decision statistics
Based on MHCLG data, the year to March 2026
78%
Overall approval rate
Below avg (87%) #275 of 296
82%
Householder approved
Below avg (90%) #269 of 296
42%
Decided in 8 weeks
Below avg (63%) #263 of 296
39%
Extended time limit
Below avg (41%) #142 of 296
60%
Minor dwellings approved
48 decided (1-9 homes)
50%
Major dwellings approved
4 decided (10+ homes)
40%
Change of use approved
47 decided
617
Total decisions
137 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.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

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.