Rear Extension planning permission examples — what gets approved & refused
358,223 real decisions from 283 UK councils. See what actually gets approved, what gets refused, and why — so you don’t waste thousands on drawings for something your council will reject.
Last updated: September 2026
Category-level approval rates for these examples are currently withheld while we re-check how decisions are sorted into project types. Each decision below is a real record from the council’s own planning portal and links to it. Council-level approval rates are unaffected and remain on the council pages.
That means roughly 1 in 6 rear extension applications are refused — often due to avoidable design issues.
358,223
Decisions
299,778
Approved
58,445
Refused
283
Councils
Rear extensions are the most common home extension in the UK — but not all get approved. Designs that are too deep, too tall, or too close to a neighbour are refused every day.
What these results show
⚠️ These are national examples. Your council could be stricter — or more lenient. See what actually gets approved on your street →
Real rear extension decisions
Real examples showing what works — and what gets refused. Use the filters to compare approved and refused applications.
Approved
Prior approval request for the erection of a single storey rear extension with a flat roof that would 1) extend beyond the rear wall of the original house by 5.75m; 2) have a maximum height of 2.80 metres and 3) have eaves that are 2.40 metres high.
Approved
Erect rear extension to house; reslate roof; works to repair chimneys and skews; renew wetdash render; new cast iron rainwater goods; replacement uPVC sash and case windows; replacement door; erect 2m garden wall with gate; and form drying area & bin storage.
Approved
REAR EXTENSION TO RETAIL UNIT (CLASS 1A) TO FORM EXTERNAL GARDEN CENTRE SALES AREA (532 SQM) AND STORAGE YARD (216 SQM), ERECTION OF 4.8 METRE HIGH FENCING AND INSTALLATION OF FLOODLIGHTS (6.5M COLUMNS) AND ENLARGEMENT OF EXISTING OPENING IN REAR ELEVATION
Approved
Prior notification for the construction of a single storey rear extension to the existing dwelling, measuring 5.5m metres beyond the rear wall; 2.7m in height from ground level; 2.75m metres in height to eaves from ground.
Approved
Prior approval for single storey flat roof rear extension, projecting 4m from the rear and 3m max height.
Approved
Lawful Development Certificate For A Proposed 3m Single Storey Rear Extension With Internal Re-model To Existing Ground Floor Plan
Approved
Removal Of Existing Flat Roof To Rear Extension and Installation Of Replacement Pitched Roof And Rooflights, Alterations And Installation Of Stair To Provide Access To First Floor Storage Area
Approved
Removal of existing rear structure and construction of single storey rear extension with flat roof.
Approved
Demolition of a conservatory and construction of a single storey rear extension, replace flat roof with pitch roof with rooflights on extension on north elevation, new porch roof and replacement/alterations to windows and doors and laying of permeable material to widen footpath
Approved
Erection of single storey rear extension with flat roof (4.5m x 3m, max height).
Approved
Prior approval submission for a single storey rear extension projecting 3.5 metres from the rear elevation of the original dwellinghouse with a height of 2.9 metres at the eaves and a maximum height of 2.9 metres and having a flat roof with 2no. roof lanterns (Valid from 23.03.2026)
Approved
Notification to determine if Prior Approval is required for a Proposed Larger Home Extension (erection of a single storey rear extension creating a total depth of 5.95m (2.7m existing depth plus a further 3.25m), maximum height 3.95m and eaves height 2.95m)
Refused
Two-storey rear extension and creation of front porch. Replacement of existing roof including increased ridge height and rendering of existing facade
09/199/LB
Refused
Expose stone gable and frontage with lime mortar repairs; wet harl outbuildings and extensions; re-roof with slate and stone; internal alterations including new toilets; convert outhouse to kitchen/dining area; add scullery and two storey rear extension; and demolish part of outbuilding to form cour
Approved
Proposed single storey rear extension up to 5m depth with a gable roof and roof lights. Measurements: Extend beyond the rear wall - 5m, height -3.80m and height at the eaves 2.30m.
Approved
External alterations to listed building, associated with stone works, and timber cladding to rear extension.
12/03025/LBC
Approved
Replace 2 no front roof windows with Conservation style roof windows, front PVCu door with timber panelled door, exisiting PVCu gutters, downpipes, clips and fittings with cast iron, rear extension concrete tiles with spanish grey slate roof tiles, complete interior rewire, repair internal plasterwo
Approved
Alter and extend dwellinghouse over-clad existing flat roof side and rear extension re-instate double garage and fit ASHP at
Approved
Application for prior approval for erection of two single storey rear extensions and one single storey side extension that projects more than 4m but less than 8m beyond the rear elevation
Approved
Lawful Development: Single storey rear extension, 4m projection
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You’re looking at national data. 16% of rear extension applications get refused — but that number could be higher or lower in your area.
See what gets approved near your home →
Approved
Lawful Development Certificate for proposed replacement single-storey rear extension with flat roof
Approved
Single storey rear extension extending 5.9m, with a height to the eaves of 2.4m and a total height of 3.95m
Approved
Single storey flat roof rear extension (flat roof to include central lantern)
Approved
Prior Approval application for a single storey rear extension (depth 4.3m x height 3.7m x 3.3m to eaves)
Approved
Prior Notification for larger single storey rear extension: Depth: 4.10m eaves height: 2.90m and a maximum height of 3.80m
Approved
Prior approval for a proposed single storey rear extension measuring 4.50m long,
Approved
Single and two storey rear extension, replacement of existing garage and re roofing and raising of ridge
Approved
Erection of a single storey rear extensionAddition of single storey extension to rear of existing building at Roof Level. The proposed extension adds another level above the existing bathroom and utilises the existing rear roof space.
Approved
Demolition of existing kitchen annex and conservatory . Construction of a single storey rear extension together with associated external alterations.
Refused
Single Storey Rear extension. Extension will extend 6.0m from original dwelling be 2.50m to eaves and max height to top of ridge 4.0m
Refused
Change of use from C3 to 6 bedroomed assisted living property, single storey extension to front and 2 storey side and rear extension.
Refused
Single storey rear extension to provide additional bedroom and living room
Refused
Prior notification of a single storey rear extension measuring 4.3m in depth and 3m maximum height
Approved
Demolition of rear single storey buildings and erection of single storey side/rear extension, widening of existing front access with provision of new ramp and new glazed doors, creation of new accesses off Cecil Street including works to existing pillars and railings. Installation of polycarbonate p
Approved
Demolition of single storey rear extension and erect single storey rear extension and first floor extension over kitchen
Approved
Retrospective application for a single storey rear extension, installation of 8 roof lights, installation of a set of patio doors and change two windows into patio doors
Approved
Erection of single storey rear extension which extends beyond the rear wall by 6.30m, has a maximum height of 3.65m and an eaves height of 3.65m
190095/DPP
Approved
Partial change of use from office accommodation (Class 4) to form 13 residential flats on upper floor levels incorporating rooftop extension with terrace; re-cladding of existing rear extension; replacement of doors; refurbishment of an existing windows, formation of new window openings and installa
Approved
Proposed single storey rear extension - extending 6m from rear wall, maximum height 3.5m and height to eaves 2.7m
Approved
Demolition of existing single-storey side extension and construction of new single-storey, rear extension
Approved
Erect single storey front extension, erect balcony to first floor front, erect first floor rear extension, form hipped to gable roof with dormers to front and rear elevations with Juliet balcony to rear
Approved
Variation of conditions 2 (Materials) and 3 (Approved Plans Condition) attached to planning permission 20251324 (Construction of single storey front and side; two storey rear extension; alterations to house (Class C3)) to allow the external walls of the dwelling to be finished in K Rend Silicone K1
Refused
Proposed single storey rear extension (length 6.00m, height 3.45m, height to eaves 3.00m)
Refused
Two storey rear extension and a porch to the side elevation following demolition of the existing single storey extensions & outbuildings.
Approved
Prior notification of a proposed change of use of ground floor accountants offices (use class A2) to three 1-bed flats (use class C3) including infilling of existing shop front and insertion of windows and entrance doors to the proposed flats plus entrance doors to first floor flats, demolition of s
Approved
ERECTION OF A NEW SINGLE STOREY FRONT ENTRANCE AND REAR EXTENSION TO THE EXISTING SCHOOL BUILDING ON LAND
11/00917/NMA
Refused
Non-material amendment to planning permission 07/00242/DET (Rear extension, porch extension and erection of conservatory and erection of garage/workshop) - Configuration of main house extension altered and configuration of garage/workshop roof altered.
Refused
Sub division of property to create 2No 3 bed properties, two storey rear extension and creation of off road car parking
Refused
Erection of two storey side and rear extension and roof alterations.
Refused
Proposed single storey rear extension (including part demolition of existing single storey rear extensions) first floor rear extension and Juliet balcony to existing rear elevation.
Refused
Ground floor side extension with two storey rear extension and internal works and new front porch.
Refused
Conversion from vacant school house to two storey dwelling with rear extension to accommodate stairs.
Refused
Prior notification for single storey rear extension(s) between 3 and 6 metres depth. This is not a planning application because it relates to development that is permitted by Government Regulation. It will not therefore be reported to the Planning Committee but considered by officers under delegated
20/0598/FUL
Refused
INSTALLATION OF BALUSTRADE TO EXISTING REAR EXTENSION TO CREATE BALCONY (PARTIALLY RETROSPECTIVE)
Approved
Front and Rear Extensions to Dwellinghouse and Formation of Steps
Approved
Extension to Dwellinghouse - Rear Extension and Introduction of Dormer Windows
P/2000/0574
Refused
Erection of rear extension to existing ground floor flat, and conversion to self-contained flat and studio flat.
Approved
Single storey rear extension (Prior Approval)
Approved
Proposed rear extension to form disabled shower room.
11/00530/FULL
Refused
Side and Rear Extension with Attic Conversion
Related guides
Do I need planning permission for a rear extension? What can you build without planning permission?Before you spend £2,000+ on drawings — and risk getting refused
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