House extensions in Milton Keynes

Milton Keynes received 515 householder applications in the last 12 months - about 10 a week. Rear extensions and garage works are the most common. Of the 384 decided so far, 325 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

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Showing 50 of 155 applications
2 days ago Under Consultation PLN/2026/1795

20 Garner Lane, Glebe Farm, Milton Keynes, MK17 8JE

Erection of a single storey rear conservatory

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1744

108 Priory Street, Newport Pagnell, MK16 9BL

The erection of a proposed garden room

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1597

The Lodge, 1 High Street, Sherington, Newport Pagnell, MK16 9NA

Proposed replacement of 5 wooden box sash windows with 5 double glazed hardwood box sash windows

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1404

30 Shelley Close, Newport Pagnell, MK16 8JB

The erection of a single storey side extension

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1520

73 Water Eaton Road, Bletchley, Milton Keynes, MK2 3DB

Erection of a two storey side and single storey front extension, garage conversion and alterations to windows and doors on front and rear elevations

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1682

21 Bute Brae, Bletchley, Milton Keynes, MK3 7TA

Proposed single story extension at rear, two story extension side, front porch

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1662

84 Buttermere Close, Bletchley, Milton Keynes, MK2 3DY

Proposed single storey front extension including a larger porch

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1761

30 Trumpton Lane, Wavendon Gate, Milton Keynes, MK7 7SS

The proposed replacement of the window and door

Householder planning permission Milton Keynes
7 Sept 2026 Under Consultation PLN/2026/1718

3 Newby Place, Emerson Valley, Milton Keynes, MK4 2NP

Certificate of lawfulness for the proposed single storey rear extension

Lawful development certificate (proposed) Milton Keynes
2 Sept 2026 Under Consultation PLN/2026/1846

5 Field Close, Sherington, Newport Pagnell, MK16 9PN

Proposed two storey side/rear extension, single storey rear extension, single storey front and two storey rear extensions to garage with alterations t...

Householder planning permission Milton Keynes
1 Sept 2026 Under Consultation PLN/2026/1837

St Peter and St Pauls Church, Church Street, Olney, MK46 4AD

Demolish existing external store and the erection of a new external store

Full planning permission Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1826

16 The Pyghtle, Olney, MK46 5PS

Proposed single storey rear extension, single storey front extension, two storey front/side extension and garage conversion

Householder planning permission Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1085

10 Sidney Close, Middleton, Milton Keynes, MK10 9TA

The erection of a single storey rear extension

Householder planning permission Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1739

11 Clifford Avenue, Bletchley, Milton Keynes, MK2 2LT

The erection of a single-storey rear extension, two-storey side extension with hip roof over and flat-roof dormer extension with Juliet balcony, front...

Householder planning permission Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1738

7 Hambledines, Redhouse Park, Milton Keynes, MK14 5FS

Certificate of lawfulness for the part conversion of the garage into living accommodation, including associated alterations and the erection of a gard...

Lawful development certificate (proposed) Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1783

8 Ludlow Close, Bletchley, Milton Keynes, MK3 6BB

Prior Approval of single storey rear extension, with eaves of 3m metres and maximum height of 3m metres, extending 4.5 metres from the original rear w...

Prior approval Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1749

24 Merlin Walk, Eaglestone, Milton Keynes, MK6 5EP

The erection of a proposed single-storey rear extension and loft conversion with rear dormer incorporating a Juliet balcony and roof lights. New side ...

Householder planning permission Milton Keynes
31 Aug 2026 Under Consultation PLN/2026/1608

Woburn Sands Methodist Church, High Street, Woburn Sands, Milton Keynes, MK17 8RH

Certificate of lawfulness for proposed replacement of 10 No. existing timber windows on the upper and lower ground floors of the northern elevation an...

Lawful development certificate (proposed) Milton Keynes
30 Aug 2026 Under Consultation PLN/2026/1686

17 Cowdray Close, Woolstone, Milton Keynes, MK15 0AP

Certificate of lawfulness for a single storey front porch extension, single storey side extension, a two-storey rear extension and a detached out-buil...

Lawful development certificate (proposed) Milton Keynes
30 Aug 2026 Under Consultation PLN/2026/1623

7 Tatling Grove, Walnut Tree, Milton Keynes, MK7 7EG

Removal of existing conservatory and construction of a single storey rear / side extension with roof lights

Householder planning permission Milton Keynes
28 Aug 2026 Under Consultation PLN/2026/1790

24 San Andres Drive, Newton Leys, Milton Keynes, MK3 5GG

Certificate of lawfulness for proposed loft conversion with rooflights to front and rear elevations

Lawful development certificate (proposed) Milton Keynes
28 Aug 2026 Under Consultation PLN/2026/1707

13 Braybrooke Drive, Furzton, Milton Keynes, MK4 1AE

Certificate of lawfulness for the proposed garage conversion

Lawful development Milton Keynes
28 Aug 2026 Under Consultation PLN/2026/1574

19 Midsummer Place, Central Milton Keynes, Milton Keynes, MK9 3GB

Replacement of principal entrance door

Full planning permission Milton Keynes
27 Aug 2026 Under Consultation PLN/2026/1772

1 Hodder Lane, Emerson Valley, Milton Keynes, MK4 2JR

Certificate of lawfulness for the proposed removal of single garage doors and installation of double garage doors

Lawful development certificate (proposed) Milton Keynes
27 Aug 2026 Under Consultation PLN/2026/1802

44 Bernay Gardens, Bolbeck Park, Milton Keynes, MK15 8QD

Removal of front porch & proposed single storey front extension with roof light

Householder planning permission Milton Keynes
26 Aug 2026 Under Consultation PLN/2026/1491

50 Bishopstone, Bradville, Milton Keynes, MK13 7DL

Conversion of garage to living accommodation

Householder planning permission Milton Keynes
25 Aug 2026 Under Consultation PLN/2026/1599

13 Windsor Street, Wolverton, Milton Keynes, MK12 5AL

Replacement of 5 windows to front elevation

Householder planning permission Milton Keynes
25 Aug 2026 Under Consultation PLN/2026/1805

7 Carolus Creek, Pennyland, Milton Keynes, MK15 8AZ

Replacement conservatory to rear elevation

Householder planning permission Milton Keynes
25 Aug 2026 Under Consultation PLN/2026/1561

16 Golden Hinde Gardens, Brooklands, Milton Keynes, MK10 7JU

Erection of a part two storey and part single storey rear extension, creating balcony at first floor level, and a single storey side and rear extensio...

Householder planning permission Milton Keynes
25 Aug 2026 Under Consultation PLN/2026/1407

23 Fen Street, Brooklands, Milton Keynes, MK10 7ES

Erection of a conservatory to rear elevation and conversion of garage to habitable space

Householder planning permission Milton Keynes
20 Aug 2026 Under Consultation PLN/2026/1750

25 Stoke Road, Bletchley, Milton Keynes, MK2 3AB

Change of use from a dwellinghouse (Class C3) to a residential care home (Class C2) for two young persons and associated external alterations to detac...

Full planning permission Milton Keynes
19 Aug 2026 Under Consultation PLN/2026/1745

13 Crowborough Lane, Kents Hill, Milton Keynes, MK7 6HE

Removal of existing conservatory, proposed single storey rear extension with roof light, front porch under extended canopy, part garage conversion, re...

Householder planning permission Milton Keynes
18 Aug 2026 Under Consultation PLN/2026/1205

14,15,16 & 17 Darin Court, Crownhill, Milton Keynes MK8 0AD

Erection of a single storey rear extension to 4 units

Full planning permission Milton Keynes
18 Aug 2026 Under Consultation PLN/2026/1576

134 Daniels Welch, Coffee Hall, Milton Keynes, MK6 5DX

Single storey side extension with rear facing dormer creating additional ancillary areas including a room within the loft space

Householder planning permission Milton Keynes
18 Aug 2026 Under Consultation PLN/2026/1609

10 Shaw Savill Way, Brooklands, Milton Keynes, MK10 7GL

Installation of a rear dormer extension and front elevation rooflights

Householder planning permission Milton Keynes
17 Aug 2026 Under Consultation PLN/2026/1630

26 Noon Layer Drive, Middleton, Milton Keynes, MK10 9FQ

Proposed erection of single storey rear extension with privacy screened balcony and infill single storey side extension

Householder planning permission Milton Keynes
17 Aug 2026 Under Consultation PLN/2026/1269

19 Wafandun Lane, Eagle Farm South, Milton Keynes, MK17 7BG

Erection of a single storey rear extension

Householder planning permission Milton Keynes
13 Aug 2026 Under Consultation PLN/2026/1384

1 Hardy Close, Glebe Farm, Milton Keynes, MK17 8WX

Erection of a single storey side extension

Householder planning permission Milton Keynes
13 Aug 2026 Under Consultation PLN/2026/1644

150 Windsor Street, Wolverton, Milton Keynes, MK12 5AS

Replacement of existing timber and uPVC windows with new uPVC windows to front, side and rear elevations

Householder planning permission Milton Keynes
12 Aug 2026 Under Consultation PLN/2026/1357

31 Cruickshank Grove, Crownhill, Milton Keynes, MK8 0EW

Replacement of existing conservatory with single storey rear extension

Householder planning permission Milton Keynes
12 Aug 2026 Under Consultation PLN/2026/1155

8 Constantine Way, Bancroft Park, Milton Keynes, MK13 0RA

Erection of single storey rear extension, front porch, section of brick wall adjacent to garage, and front and side brick planters/walls

Householder planning permission Milton Keynes
12 Aug 2026 Under Consultation PLN/2026/1505

37 High Street, Olney, MK46 4EB

Replace existing rear facing bay window with bi-folding timber doors, infilling of ground floor side door with matching construction, introduction of ...

Householder planning permission Milton Keynes
12 Aug 2026 Under Consultation PLN/2026/1700

63 Moores Hill, Yardley Road, Olney, MK46 5DY

Proposed erection of a single storey rear extension and front porch extension

Householder planning permission Milton Keynes
12 Aug 2026 Under Consultation PLN/2026/1691

Abbey Farm House, Lavendon Grange, Lavendon, Olney, MK46 4HL

Proposed alterations to main house to form new balcony and extended roof, extension and conversion of existing single storey open-sided barn to form n...

Householder planning permission Milton Keynes
11 Aug 2026 Under Consultation PLN/2026/1605

Tokairo House, 8 Copperhouse Court, Caldecotte, Milton Keynes, MK7 8NL

Construction of part single/part two storey roof extension (at second and third floor level) to form three dwellings over existing office space

Full planning permission Milton Keynes
11 Aug 2026 Under Consultation PLN/2026/1698

6 White Hill, Olney, MK46 5AY

Certificate of lawfulness for a proposed single storey rear extension

Lawful development Milton Keynes
11 Aug 2026 Under Consultation PLN/2026/1591

Paddock House, 36 Gravel Walk, Emberton, Milton Keynes, MK46 5JA

The proposed erection of a residential annexe

Householder planning permission Milton Keynes
11 Aug 2026 Under Consultation PLN/2026/1619

Great Linford Sports Pavilion, Marsh Drive, Great Linford, Milton Keynes, MK14 5HH

Proposed single storey extension to existing sports pavilion formed by enclosing and roofing over the existing walled storage yard which is enclosed o...

Full planning permission Milton Keynes
11 Aug 2026 Under Consultation PLN/2026/0972

21 Osier Lane, Shenley Lodge, Milton Keynes, MK5 7EP

Proposed erection of partial double storey rear extension and front porch extension

Householder planning permission Milton Keynes
10 Aug 2026 Under Consultation PLN/2026/1666

148 Cambridge Street, Wolverton, Milton Keynes, MK12 5AQ

Replacement windows and entrance door to front elevation (part retrospective)

Householder planning permission Milton Keynes
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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, whether taller, larger or 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 those drawing a lot of comments, can take longer.
Can I get email alerts for new extensions applications in Milton Keynes?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Milton Keynes. You can also narrow the alert to a postcode, street, or drawn area.

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