Public evidence profile
Design Extension - https://www.designextension.co.uk/
Planning history
50 public planning applications
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Verified planning history
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Design Extension - https://www.designextension.co.uk/’s real planning history from public planning applications, showing where they’ve worked and how often schemes were approved. · Active 2022–2026
approval rate77%
planning applications50
approved schemes30
councils worked in7
What they work on
The kinds of project Design Extension - https://www.designextension.co.uk/ has filed planning applications for.
- Loft conversion14
- Rear extension23
- Side extension2
- Two-storey extension7
- Extension31
- Outbuilding / garden room6
- Conservatory / orangery1
- Porch4
- Boundary wall / fence / gates1
- Listed building / conservation1
- Demolition4
- Windows & doors6
- Roof / fenestration18
Where they’ve worked
Each pin is a planning application, coloured by the council decision we found.
Council experience
- Sutton · 39 applications since 2022See planning experience in Sutton
- Brent · 3 applications since 2024See planning experience in Brent
- Westminster · 3 applications since 2025See planning experience in Westminster
- Southwark · 2 applications since 2022See planning experience in Southwark
- Croydon · 1 application since 2024See planning experience in Croydon
- Lambeth · 1 application since 2026See planning experience in Lambeth
- Lewisham · 1 application since 2026See planning experience in Lewisham
Recent planning applications
- No decision148 St Dunstans Hill Cheam SM1 2TUErection of a single storey rear extension.
- No decision12 Claydon Drive Beddington CR0 4QXErection of a part one, part two storey rear extension.
- Approved46 Milton Avenue Sutton SM1 3QEErection of a single storey rear extension.
- Approved11 BROCKILL CRESCENT, LONDON, SE4 2PTApplication for a Lawful Development Certificate (proposed) submitted under Section 192 of the Town & Country Planning Act 1990 (as amended) and Class E of Schedule 2, Part 1 of the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) for the construction of an outbuilding in the rear garden at 11 Brockill Crescent, SE4
- Approved29 Holland Avenue Cheam SM2 6HWErection of a part one, part two storey side and rear extension with alterations to the fenestrations and erection of a new garage. Conversion of loft space involving alterations to existing roofline, removal of three chimney stacks,a dormer window to the front, a window to flank and rear roofslopes.
- Refused16 Denny Street London SE11 4UXReplacement of Existing Sash and Casement Timber Windows and Timber Doors With Double-Glazed Timber Units Matching Existing Profiles. (Please note: The reference number for this Listed Building Consent application is 25/03711/LB but there is also an associated application for Full Planning Permission related to these works with reference number: 25/03641/FUL)
- No decision139 Castellain Mansions Castellain Road London W9 1HGReplacement of existing 2nd floor front, side and rear windows and door with double-glazed timber sash windows and door (retaining original frames and structural openings); white paint finish to match existing.
- No decision15 Surrey Grove Sutton SM1 3PWErection of a single storey rear extension, alterations to ground floor front and first floor flank fenestrations.
Show all 50 planning applicationsShow fewer planning applications
- No decisionFlat 8 58 Rutland Gate London SW7 1PLInstallation of replacement fineo glazing timber sash windows and painted white to flat 8 at third floor level. Linked with 25/07102/FULL
- No decisionFlat 8 58 Rutland Gate London SW7 1PLInstallation of replacement fineo glazing timber sash windows and painted white to flat 8 at third floor level. Linked with 25/07103/LBC
- Approved174 Woodcote Road Wallington Sutton SM6 0PDErection of a part one, part two storey rear and side extension.
- No decision34 Richmond Road Beddington CR0 4SFConversion of loft space involving a dormer extension at rear and rooflights to front roofslope.
- Approved30 Cressingham Grove Sutton SM1 4ERConversion of loft space involving alterations to existing roofline, a dormer extension at rear, rooflights to front roofslope and removal of flank chimney stacks.
- No decision30 Hamilton Way Wallington SM6 9NJFormation of a front entrance porch and erection of a single storey rear extension.
- No decision34 Richmond Road Beddington CR0 4SFConversion of loft space involving a dormer extension at rear with rooflights to front roofslope and demolition of original single storey outrigger to the rear and alterations to rear fenestrations.
- Approved54 Norman Road Sutton SM1 2TAPrior Approval for a single storey rear extension projecting from the rear of the original house by 4m.
- Approved25 The Newlands Wallington SM6 9JXErection of a part one, part two storey rear extension with raised patio and steps to rear, conversion of garage into habitable room and associated external work and conversion of loft space involving alterations to existing roofline, a dormer extension at rear and rooflights to front roofslope.
- Approved25 The Newlands Wallington SM6 9JXErection of a single storey rear extension with steps and conversion of the garage into a habitable room.
- Approved25 The Newlands Wallington SM6 9JXErection of a part one, part two storey side and rear extension with raised patio and steps, conversion of existing garage into a habitable room with associated external works and conversion of loft space involving a dormer extension at rear and rooflights to front roofslope.
- Approved25 The Newlands Wallington SM6 9JXErection of a part one, part two storey rear extension with steps to rear and conversion of existing garage into a habitable room with associated external works.
- Refused25 The Newlands Wallington SM6 9JXErection of a single storey outbuilding.
- Approved51 Hillview Road Sutton SM1 3NSConversion of loft space involving alterations to existing roofline, including a hip to gable extension, a dormer extension at rear and rooflights to front roofslope.
- No decision77 York Road Cheam SM2 6HNErection of a part one, part two storey front, side and rear extension, a single storey front extension and conversion of loft space involving alterations to existing roofline, three dormer extensions at rear and rooflights to front roofslope.
- Refused646 North Circular Road, Neasden, London, NW2 7QJCertificate of lawfulness for proposed hip-to-gable roof extension, rear dormer extension with 1x rooflight on flat of roof of dormer and installation of 2x front rooflights to dwellinghouse
- Approved646 North Circular Road, Neasden, London, NW2 7QJPrior approval for a single storey rear extension to dwellinghouse, in metres: Extending beyond the rear wall of the original house - 6m Maximum height - 3m Eaves height - 3m
- Refused29 Kemble Road Croydon CR0 4JQErection of a front porch (retrospective)
- No decision77 York Road Cheam SM2 6HNErection of a part one, part two storey front, side and rear extension and formation of a front entrance porch. Conversion of loft space involving alterations to existing roofline and rooflights to front and rear roofslope.
- RefusedFlat 4 193A High Street Sutton SM1 1JUProvision of replacement windows.
- Approved77 York Road Cheam SM2 6HNErection of a part one, part two storey front, side and rear extension and formation of a front entrance porch.
- Approved77 York Road Cheam SM2 6HNPrior Approval for a single storey rear extension projecting from the rear of the original house by 6m.
- Refused55 Grove Crescent, London, NW9 0LSDemolition of rear conservatory & garage and erection of single-storey rear extension with raised patio to dwellinghouse
- Approved64 Dibdin Road Sutton SM1 2PQAlterations to existing side extension with raising of roof height, relocation of door and installation of fenestration.
- Refused4 Latimer Close Worcester Park KT4 8UFErection of a single storey front extension.
- Approved23 St Margarets Avenue North Cheam SM3 9TUDemolition of detached garage and erection of an outbuilding.
- Approved429 Sutton Common Road Sutton SM3 9JDDemolition of the existing garage and erection of an outbuilding.
- Approved27 Sorrento Road Sutton SM1 1QUErection of a single storey rear extension, conversion of loft space involving alterations to existing roofline, a dormer extension at rear and roof lights to front roof slope.
- Approved33 Hamilton Way Wallington SM6 9NJErection of a single storey detached outbuilding to rear garden.
- Approved33 Sprucedale Gardens Wallington SM6 9LBErection of a part one, part two storey rear extension and alterations to the ground and first floor flank fenestration.
- Refused27 Sorrento Road Sutton SM1 1QUErection of a part one, part two rear extension, conversion of loftspace involving alterations to existing roofline, hip to gable and a dormer to rear with rooflights to front roofslope.
- Approved3 Lincoln Terrace York Road Cheam Sutton SM2 6HEErection of a single storey front and rear extensions and installation of first floor railings.
- Approved33 Sprucedale Gardens Wallington SM6 9LBPrior Approval for a single storey rear extension projecting from the rear of the original house by 6m.
- Approved3 Lincoln Terrace York Road Cheam Sutton SM2 6HEErection of a single storey detached outbuilding to rear garden.
- Refused33 Hamilton Way Wallington SM6 9NJErection of a single storey rear extension to existing garage.
- Approved8 Monksdene Gardens Sutton SM1 3BYConversion of loft space involving alterations to existing roofline, hip to gable with a dormer extension at rear and rooflights to front roofslope.
- Approved60 Whittaker Road Sutton SM3 9QGConversion of loftspace involving alterations to existing roofline, hip to gable, dormer to rear roofslope and rooflights to front and rear roofslopes.
- Approved8 Johnsons Close Carshalton SM5 2LUConversion of garage into habitable rooms together with associated fenestration alterations.
- Approved83 Manor Road Wallington SM6 0DEApplication to clear conditions 7 (Energy Statement) and 8 (SAP) of approved application DM2018/02147.
- Approved83 Manor Road Wallington SM6 0DEApplication to clear conditions 9 (Surface Water Run-off) and 10 (Drainage and Flood Risk) of approved application DM2018/02147.
- ApprovedFlat 13 Peacock House 38 St Giles Road London Southwark SE5 7RGNew single glazed timber door, painted white. No changes to structural opening.
- Approved55 Lorrimore Road London Southwark SE17 3LZRemove existing timber windows and replace them with new slimline timber double glazing.
Heritage experience: 2 listed-building or conservation-area consent applications found in official planning applications.
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