House extensions in Buckinghamshire

Buckinghamshire received 655 householder applications in the last 12 months - about 13 a week. Rear extensions and garage works are the most common. Of the 160 decided so far, 117 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

503 last 90 days
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150 last 30 days
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48 last 14 days

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Showing 50 of 503 applications
PL/26/04414/FA 2 days ago Registered

Potters Wood 9 Robson Close Chalfont St Peter Buckinghamshire SL9 0PS

Internal alterations including removal of internal walls and re-locating the staircase. Refurbishing the Kitchen into an open area. Building a side ex...

Buckinghamshire
PL/26/03770/FA 2 days ago Registered

Highlands Cottage 47 Copthall Lane Chalfont St Peter Buckinghamshire SL9 0DQ

Creation of first floor with associated roof and fenestration alterations. Single storey front/side/rear extensions.

Buckinghamshire
PL/26/05450/PAHAS 9 Jul 2026 Registered

Tudor Cottage Langley Park Road Iver Buckinghamshire SL0 0JQ

Notification under The Town and Country Planning (General Permitted Development) Order 2015, Amendment to Part 1 of Schedule 2 Class AA for additional...

Buckinghamshire 9 Jul 2026
PL/26/05164/FA 9 Jul 2026 Registered

Willow Lodge 31 New Road Little Kingshill Buckinghamshire HP16 0EZ

Extension and conversion of existing garage to habitable space. First floor side extension and alterations to fenestration

Buckinghamshire 9 Jul 2026
PL/26/04979/FA 9 Jul 2026 Registered

12 Chenies Parade Little Chalfont Buckinghamshire HP7 9PH

Change of use of ground floor from existing hardware retails shop (Use Class E(a)) to a restaurant (Use Class Class E(b)) together with alterations to...

Buckinghamshire 9 Jul 2026
PL/26/05456/PNE 6 Jul 2026 Registered

4 Shelburne Road High Wycombe Buckinghamshire HP12 3NJ

Notification under The Town and Country Planning (General Permitted Development) Order 2015, Part 1 of Schedule 2 Class A for: single storey rear exte...

Buckinghamshire 6 Jul 2026
PL/26/05506/PNE 6 Jul 2026 Registered

5 Stirling Avenue Aylesbury Buckinghamshire HP20 1BE

Notification under The Town and Country Planning (General Permitted Development) Order 2015, Part 1 of Schedule 2 Class A for: single storey rear exte...

Buckinghamshire 6 Jul 2026
PL/26/05051/FA 6 Jul 2026 Registered

6 Bowyer Crescent Denham Buckinghamshire UB9 5JE

Erection of a part ground-floor rear extension and part first-floor rear extension

Buckinghamshire 6 Jul 2026
PL/26/04976/FA 6 Jul 2026 Registered

7 Bell Close Beaconsfield Buckinghamshire HP9 1AT

Conversion of existing integral/attached garage to habitable accommodation, associated internal alterations, widening of existing vehicular crossover ...

Buckinghamshire 6 Jul 2026
PL/26/04944/FA 6 Jul 2026 Registered

1 & 2 The Cottages Owlswick Buckinghamshire

Works of demolition and the erection of extensions with associated roof alterations

Buckinghamshire 6 Jul 2026
PL/26/05384/HB 3 Jul 2026 Registered

Marron House Whaddon Hall High Street Whaddon Buckinghamshire MK17 0NA

Listed building application to remove existing single storey kitchen roof and replace with new roof and internal alterations (retrospective)

Buckinghamshire 3 Jul 2026
PL/26/05160/SA 3 Jul 2026 Registered

3 Trinity Avenue Marlow Buckinghamshire SL7 3AL

Certificate of lawfulness for the proposed dropped kerb to allow off street parking

Buckinghamshire 3 Jul 2026
PL/26/05159/SA 3 Jul 2026 Registered

5 Trinity Avenue Marlow Buckinghamshire SL7 3AL

Certificate of lawfulness for the proposed extension of an existing dropped kerb from 1.8m to 4.2m to allow improved access onto and off of the drive ...

Buckinghamshire 3 Jul 2026
PL/26/04476/FA 3 Jul 2026 Registered

The School House 54 Vicarage Road Marsworth Buckinghamshire HP23 4LT

Small extension to side utility room in order to move downstairs toilet.

Buckinghamshire 3 Jul 2026
PL/26/03668/FA 3 Jul 2026 Registered

4 Highbeeches Close Marlow Bottom Buckinghamshire SL7 3PX

Construction of a gazebo (part retrospective)

Buckinghamshire 3 Jul 2026
PL/26/05208/FA 2 Jul 2026 Registered

Magnolia Cottage Jasons Hill Chesham Buckinghamshire HP5 3QW

First floor extension with three rear dormers and a side window

Buckinghamshire 2 Jul 2026
PL/26/04986/FA 2 Jul 2026 Registered

Old Acres Owlswick Buckinghamshire HP27 9RH

Construction of carport with living accommodation above and first floor link to main dwelling. Existing lean-to rebuilt and replacement of gable with ...

Buckinghamshire 2 Jul 2026
PL/26/05349/SA 2 Jul 2026 Registered

2 Moore Crescent Aylesbury Buckinghamshire HP18 1AH

Certificate of lawfulness for the proposed single storey rear extension

Buckinghamshire 2 Jul 2026
PL/26/05345/SA 2 Jul 2026 Registered

6 Phoebes Orchard Stoke Hammond Buckinghamshire MK17 9LW

Certificate of lawfulness for the proposed garage conversion

Buckinghamshire 2 Jul 2026
PL/26/05331/PNE 1 Jul 2026 Registered

White Cottage Fir Tree Avenue Stoke Poges Buckinghamshire SL2 4NN

Notification under The Town and Country Planning (General Permitted Development) Order 2015, Part 1 of Schedule 2 Class A for: single storey rear exte...

Buckinghamshire 1 Jul 2026
PL/26/05318/SA 1 Jul 2026 Registered

Pitchers Ground Aylesbury Road Askett Buckinghamshire HP27 9LY

Certificate of lawfulness for the proposed erection of a single storey rear extension

Buckinghamshire 1 Jul 2026
PL/26/05329/SA 1 Jul 2026 Registered

Ash Cottage 68 Plantation Road Amersham Buckinghamshire HP6 6HL

Certificate of lawfulness for the proposed replacement of the existing dormer with new rear dormer

Buckinghamshire 1 Jul 2026
PL/26/05080/FA 1 Jul 2026 Registered

Churchfield Lodge Churchfield Road Chalfont St Peter Buckinghamshire SL9 9EN

Conversion of existing commercial office to 1 bed flat and 2 studio flats including construction new raised roof to provide second floor accommodation...

Buckinghamshire 1 Jul 2026
PL/26/05284/FA 1 Jul 2026 Registered

52 Whielden Street Amersham Buckinghamshire HP7 0HU

Erection of garden wall and greenhouse

Buckinghamshire 1 Jul 2026
PL/26/04895/FA 1 Jul 2026 Registered

49 - 51 High Street Aylesbury Buckinghamshire HP20 1SA

Conversion of existing commercial building to form ground floor retail unit with existing shop front and rear access. New access to rear of property t...

Buckinghamshire 1 Jul 2026
PL/26/04472/FA 1 Jul 2026 Registered

1 Northumberland Avenue Aylesbury Buckinghamshire HP21 7HG

Existing Garage conversion into a habitable space, Single Story rear and side extension, Erection of new Front Porch

Buckinghamshire 1 Jul 2026
PL/26/05301/SA 30 Jun 2026 Registered

7 Lancaster Road Aylesbury Buckinghamshire HP21 7HF

Certificate of Lawfulness for proposed installation of a new vehicle access

Buckinghamshire 30 Jun 2026
PL/26/05290/SA 30 Jun 2026 Awaiting decision

3 Glory Mill Lane Wooburn Green Buckinghamshire HP10 0BX

Certificate of Lawfulness for a proposed loft conversion to include rear dormer

Buckinghamshire 30 Jun 2026
PL/26/05299/PAHAS 30 Jun 2026 Registered

Little Acre Perry Lane Bledlow Buckinghamshire HP27 9QS

Notification under The Town and Country Planning (General Permitted Development) Order 2015, Amendment to Part 1 of Schedule 2 Class AA for additional...

Buckinghamshire 30 Jun 2026
PL/26/05098/FA 30 Jun 2026 Registered

Hope Cottage Templewood Lane Stoke Poges Buckinghamshire SL2 4AN

Part first floor part two storey side extension and demolition of single storey rear projection.

Buckinghamshire 30 Jun 2026
PL/26/04924/FA 30 Jun 2026 Registered

The Beech Tree Amersham Road High Wycombe Buckinghamshire HP13 5AJ

Erection of single-storey rear extension incorporating painted timber cladding and painted timber windows to match existing building, with pitched sla...

Buckinghamshire 30 Jun 2026
PL/26/05257/PNAD 29 Jun 2026 Registered

Barn at Wotton Underwood Ashendon Road Wotton Underwood HP18 0SD

Prior Notification under Schedule 2, Part 3, Class Q of the Town and Country Planning (General Permitted Development) (England) Order 2015 for the con...

Buckinghamshire 29 Jun 2026
PL/26/05074/FA 29 Jun 2026 Registered

10 Rogers Lane Stoke Poges Buckinghamshire SL2 4LD

Demolition of existing shed and construction of new single storey outbuilding in rear garden for gym and storage use

Buckinghamshire 29 Jun 2026
PL/26/05027/FA 29 Jun 2026 Registered

73 Raven Road Stokenchurch Buckinghamshire HP14 3QW

Single storey front extension, new garage and extended dropped kerb.

Buckinghamshire 29 Jun 2026
PL/26/05018/FA 29 Jun 2026 Registered

4 Perth Road High Wycombe Buckinghamshire HP13 6XX

Proposed single storey rear extension, outbuilding within the rear garden and new dropped kerb with associated off street parking.

Buckinghamshire 29 Jun 2026
PL/26/05004/FA 29 Jun 2026 Registered

25 Ashlea Road Chalfont St Peter Buckinghamshire SL9 8NY

First floor side roof extension and extend existing front porch

Buckinghamshire 29 Jun 2026
PL/26/04960/FA 29 Jun 2026 Registered

Heybote Ellesborough Road Butlers Cross Buckinghamshire HP17 0XF

Single storey rear extension and first floor front extension with associated roof alterations and rear terrace

Buckinghamshire 29 Jun 2026
PL/26/04925/FA 29 Jun 2026 Registered

120A Marlow Bottom Marlow Bottom Buckinghamshire SL7 3PH

Single storey rear extension, loft conversion to include raising the roof , 4 dormers and 1 skylights and external render. Double storey front extensi...

Buckinghamshire 29 Jun 2026
PL/26/04746/FA 29 Jun 2026 Registered

37 Mount Close High Wycombe Buckinghamshire HP12 3PE

Erection of a 3 x bedroom dwelling to side of existing dwelling with extended dropped kerb

Buckinghamshire 29 Jun 2026
PL/26/04731/FA 29 Jun 2026 Registered

42A Manor Park Maids Moreton Buckinghamshire MK18 1QX

replacement front porch

Buckinghamshire 29 Jun 2026
PL/26/04743/FA 29 Jun 2026 Registered

3 Hemingway Road Aylesbury Buckinghamshire HP19 8SD

New enclosed larger porch to front & upward extension of existing garage to form new habitable room

Buckinghamshire 29 Jun 2026
PL/26/04382/FA 29 Jun 2026 Registered

7 Merton Close Aylesbury Buckinghamshire HP18 0ZN

Proposed loft conversion with front and rear velux windows

Buckinghamshire 29 Jun 2026
PL/26/04283/FA 29 Jun 2026 Registered

3 Hawridge Lane Bellingdon Buckinghamshire HP5 2XX

Single storey rear extension linked to an existing single storey wash house.

Buckinghamshire 29 Jun 2026
PL/26/04216/FA 29 Jun 2026 Registered

Nine St Huberts Cottages 30 East Common Gerrards Cross Buckinghamshire SL9 7AQ

Conversion of existing garage into home office/gym, including proposed 3.0m rear extension

Buckinghamshire 29 Jun 2026
PL/26/03796/FA 29 Jun 2026 Registered

St Marys Church Church End Haddenham Buckinghamshire HP17 8EJ

Stand alone bin store for organic waste from the churchyard.

Buckinghamshire 29 Jun 2026
PL/26/05270/FA 29 Jun 2026 Registered

Mayfair House 49 Woodhill Avenue Gerrards Cross Buckinghamshire SL9 8DR

Erection of garage

Buckinghamshire 29 Jun 2026
PL/26/05028/SA 29 Jun 2026 Registered

5 Ash Grove Stoke Poges Buckinghamshire SL2 4AG

Certificate of lawfulness for the proposed dropped kerb

Buckinghamshire 29 Jun 2026
PL/26/04953/FA 29 Jun 2026 Registered

17 Taylor Road Aylesbury Buckinghamshire HP21 8DR

Erection of garden room / gym

Buckinghamshire 29 Jun 2026
PL/26/05202/PNE 26 Jun 2026 Registered

16 Stanley Hill Amersham Buckinghamshire HP7 9HR

Notification under The Town and Country Planning (General Permitted Development) Order 2015, Part 1 of Schedule 2 Class A for: single storey rear exte...

Buckinghamshire 26 Jun 2026
PL/26/05015/FA 26 Jun 2026 Registered

Dom 38 Chequers Lane Prestwood Buckinghamshire HP16 9DR

Conversion of existing garage to residential accommodation, Part single storey side and rear extension.

Buckinghamshire 26 Jun 2026
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Frequently asked questions

When do you need planning permission for a house extension?
Single-storey rear extensions up to 4m (detached) or 3m (semi-detached / terraced) are usually permitted development. Two-storey extensions, anything in a conservation area, or larger projects almost always need a planning application.
What's the difference between planning permission and permitted development?
Permitted development rights let you build certain things without applying for planning permission, subject to specified limits. Anything outside those limits — taller, larger, in a protected area — needs full planning permission.
How long does a householder application take?
The statutory target is 8 weeks from validation. Most simple householder extensions are decided within that window; complex or contested cases (especially with objections) can take longer.
Can I get email alerts for new extensions applications in Buckinghamshire?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Buckinghamshire. You can also narrow the alert to a postcode, street, or drawn area.

We check Buckinghamshire's planning portal daily. New extensions applications appear here within a day of being published.