Two-Storey Extension planning permission examples — what gets approved & refused
91,942 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 5 two-storey extension applications are refused — often due to avoidable design issues.
91,942
Decisions
74,310
Approved
17,632
Refused
283
Councils
Two-storey extensions face more scrutiny than single-storey ones — they are taller, more visible, and have greater impact on neighbouring properties. Approval rates are slightly lower as a result.
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 two-storey extension decisions
Real examples showing what works — and what gets refused. Use the filters to compare approved and refused applications.
Approved
Ground floor single storey kitchen extension to provide a wc and first floor extension over the existing kitchen to relocate the bathroom and make the bedrooms bigger.
Approved
Change of use to create 4no two bedroom dwellings and 1no five bedroom dwelling including demolition of flat roof extensions and erection of rear two storey extension (Departure from the Development Plan) (Development affecting the setting of a Listed Building)
22/01051/NMA
Approved
Non material amendment sought to approved two storey side extension under planning permission ref 21/01590/FUL for 2 additional windows and changing pitched roof to flat roof
Approved
First-floor extension to existing single-storey dwelling with a maximum height of 7.23m
Approved
Listed building consent for a change of use from offices to 8 dwellings; demolition of outbuilding to rear of no.9 to be replaced with 2 storey extension; demolition of single storey flat roof extension to rear of no.6
Approved
Listed building consent for the installation of a glass roof over the lower ground floor rear lightwell; damp-proofing works and installation of insulation at lower ground floor level; construction of a first-floor extension over the existing rear outrigger; internal alterations to the lower ground,
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
Lawful Development Certificate for the Proposed Erection of a Single Storey Side Extension, Two Storey Rear Extension, Porch and a Detached Outbuilding Along With Revised Driveway to the Existing Dwellinghouse
Approved
Erection of pitched roof over existing flat-roof extension to rear, 1 no. new dormer window, 2 storey extension to existing single storey off-shot, external stair and railing to rear ground floor, alterations to front and rear boundary treatments,...
Approved
Two storey rear extension and internal alterations to existing detached barn
Approved
First floor extension over existing rear flat roof extension. Replace and enlarge rear porch.
Approved
Single and two storey rear extension, replacement of existing garage and re roofing and raising of ridge
2021/1599
Approved
Upward extension to convert existing bungalow into two storey dwellinghouse with two storey rear extension and changes to external facing materials and fenestration details (Application for prior approval of a proposed enlargement of a dwellinghouse by constructing additional storeys)
Approved
Demolition of existing garage, outbuildings and existing porch structure. Erection of new porch structure, one and two storey rear extension and single storey side extension. Aesthetic changes to all elevations and amendments to existing roof structure. (Revised scheme, already commenced)
Approved
Two-storey extension to existing garage including formation of roof terrace, and installation of solar panels on roof of garage
Approved
Non-material Amendment of 24/00751/FUL: Changing the external first floor finish of the proposed two-storey extension at the side and front elevations from facing brick / render to composite cladding
Approved
Erection of a two storey side extension and single storey rear extension with pitched roof over front bay window.
Approved
Application for a non-material amendment of planning permission P/2025/0034 (Two storey extensions to side and rear and re-roofing works) to replace bedroom 2 window on side (west) elevation to french doors and Juliette balcony & reduce no....
10/02229/LBC
Refused
Demolition of existing single storey kitchen extension, two chimneys and erection of new two storey extension to house
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
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Approved
Consultation from Mole Valley District Council for the Erection of two storey rear extension with balcony and insertion of 1 No. dormer window and 1 No. roof light to front elevation.
Approved
Non material amendment of planning application P/25/0076 to include a roof light in the front roof slope of the two storey side extension
APP/2012/0894
Approved
Non material amendment - Construction of two storey extension and glazed timber lean-to to rear (east) elevation (amendment to application FUL/2008/1094 granting approval for change of use of former industrial unit to dwellinghouse)
Approved
Article 16 consultation from Manchester City Council in relation of application 128908/FO/2020 for Erection of a two storey side extension to form additional living accommodation and formation of driveway at front of property.
Approved
Demolition of single storey rear extension and erect single storey rear extension and first floor extension over kitchen
Approved
Partial Demolition of 2 Storey Extension to Rear with Partial Infill and Remedials of Resultant Exposed Facades. In Addition, Demolition Works Associated with Remedial Measures to Resultant Gable of 156 High Street Due to Demolition of Adjacent Shopping Centre.
Approved
Discharge of condtion 6 (security shutters) of planning consent 14/P/00258 for Erection of a single storey extension to existing garage, erection of two-storey extension to existing dwelling, widening of existing asphalt driveway and alterations to ground levels & new treatment to boundary adjacent
Approved
Application to vary conditions 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 26, 27, 29 and 32 of the approved planning permission 20/P/1673/FUL (reconfiguration and two storey extension to the existing retail unit to include a gym (use class E) and additional ground floor reta
Approved
Application for Listed Building Consent:- Two storey side extension
09/00420/FULCA
Approved
To erect a two storey extension to the front of the existing two storey property.
22/00529/FUL
Approved
Demolition of existing extension and outbuildings. Construction of replacement, part one and part two storey extension, and a roof terrace above the single storey component to provide ancillary accommodation. Associated works to the elevation of the house. Landscape works, including replacement of e
Approved
Two storey extension to school, additional car parking, relocation of existing bin store and new bike store, rearrangement of hard and soft play areas and support infrastructure.
Details to satisfy condition 8 - External Lighting Strategy for Bats
Approved
Removal of existing rear extension and garage and erection of 1 1/2 storey extension to side and rear of dwelling
10/00240/FULL
Refused
Two Storey Extension to the Side of Existing Dwellinghouse and Change of Use to Guest House
Refused
Two Storey Side Extension To Provide Garage, WC & Dining Room On Ground Floor With 2No. Bedrooms Above
23/00363/FUL
Refused
Full Planning Application for the construction of a two storey extension to the single-family dwelling bungalow; to create 2 self-contained flats, with associated bicycle parking and refuse storage.
Refused
Erection of single rear storey, two storey extensions to side and rear and raising the ridge height by 1.6m
Refused
Demolition of existing garage and new two storey side extension, front porch and extended drive
Refused
Non-material amendment to planning permission 2025/0234/FUL - Rendering top and bottom of new 2 storey extension.
Approved
CERTIFICATE OF LAWFULNESS (SECTION 192) FOR THE PROPOSED ERECTION OF A PART SINGLE/PART TWO STOREY EXTENSION AT REAR.
Approved
Erection of two storey side extension, alterations to existing garage
Approved
Application for a Lawful Development Certificate for a Proposed two storey rear extension.
Approved
Two-storey extension to front and side of house with single storey extension to rear.
181442/DPP
Approved
Change of use from class 7 (hotels and hostels) to form 10 no. residential flats (sui generis) including alteration to existing rear extension and erection of 2 storey extension to rear; installation of replacement windows to front; dormers replacement to rear and formation of new entrance at lower
Approved
Erection of two storey rear extension to enlarge both flats including a first floor rear balcony and insertion of new windows to existing side gable
Approved
Certificate of lawfulness (proposed): erection of two storey rear extension
Approved
Demolition of an existing garage, construction of a replacement garage, a first-floor extension, a replacement entrance porch and associated site improvements
Refused
Sub division of property to create 2No 3 bed properties, two storey rear extension and creation of off road car parking
Refused
New pitched garage roof, new roof lights and first floor rear extension/roof conversion
Refused
Full planning application for single and two storey rear extension and retrospective chicken coop and canopy to agricultural building, use of land for garden and parking area and track
Refused
Retrospective amendment to planning consent TP/ED/20/0191 - two storey side extension, single storey rear extension, front porch and addition of rear dormer window
Refused
Two storey side extension, single storey rear extension, decking and other external alterations
Refused
Single and two storey extension to dwellinghouse; and formation of dormer windows
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
Demolish conservatory/sun room and erect two storey extension at
Refused
Lawful Development Certificate for proposed two storey rear extension, single storey side extension and front porch.
Approved
Erection of two storey extension to rear with installation of mezzanine floor, new shop front and associated plant and machinery. Reconfiguration of car parking to rear and front to include public realm, landscaping and associated infrastructure works
Approved
Erection of two storey extension to side and single storey extension to rear of dwellinghouse
Refused
Conversion of the existing House in Multiple Occupation (Use Class C4) and the construction of a glazed link on the ground floor and a first floor rear extension to provide 3 self-contained flats, together with the provision of a bike store in the rear garden and all associated works at 157 Trundley
Approved
Two storey rear extension and new front porch
Related guides
Rear extension planning permission guideBefore you spend £2,000+ on drawings — and risk getting refused
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