House extensions in North Ayrshire

North Ayrshire received 200 householder applications in the last 12 months - about 4 a week. Garage works and dormers are the most common. Of the 161 decided so far, 158 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 61 applications
22 Oct 2026 Pending Consideration 26/00730/PP

16 George Street Stevenston North Ayrshire KA20 3NB

Erection of single storey extension to rear of semi-detached dwelling house

Planning Permission (Full) North Ayrshire
22 Oct 2026 Pending Consideration 26/00678/PP

19 Underwood Kilwinning North Ayrshire KA13 7HR

Erection of two storey side extension and single storey rear extension to detached dwellinghouse

Planning Permission (Full) North Ayrshire
22 Oct 2026 Pending Consideration 26/00729/PP

5 Ashenyards Park Stevenston North Ayrshire KA20 3EG

Replacement of cladding, re-spraying of various elements of the unit.

Planning Permission (Full) North Ayrshire
20 Oct 2026 Pending Consideration 26/00702/PP

3 Grange Road Stevenston North Ayrshire KA20 3EA

Erection of extension to rear of detached dwelling house

Planning Permission (Full) North Ayrshire
20 Oct 2026 Pending Consideration 26/00666/PP

Flat 2 9 Glasgow Street Millport Isle Of Cumbrae North Ayrshire KA28 0DJ

Alterations to existing dormer windows to form additional side windows, alteration to existing velux window and new velux window

Planning Permission (Full) North Ayrshire
19 Oct 2026 Pending Consideration 26/00697/PP

78 Gallowgate Street Largs North Ayrshire KA30 8LZ

Sub-division of existing maisonette and addition of new build 3rd floor creating 3 individual flats, upper two properties accessed via extended stairs...

Planning Permission (Full) North Ayrshire
14 Oct 2026 Pending Consideration 26/00704/PP

36 Castlepark Drive Fairlie Largs North Ayrshire KA29 0DG

Enlargement of front dormer, formation of rear dormer, installation of rooflights and erection of single storey rear extension to dwelling house

Planning Permission (Full) North Ayrshire
12 Oct 2026 Pending Consideration 26/00695/PP

31 Ardrossan Road Seamill West Kilbride North Ayrshire KA23 9NA

External alterations to include the installation of windows at basement level on northern and western elevations and formation of inset balconies at f...

Planning Permission (Full) North Ayrshire
12 Oct 2026 Pending Consideration 26/00693/PP

29 Knockrivoch Place Ardrossan North Ayrshire KA22 7PY

Erection of single storey side extension and external alterations to facilitate conversion of garage to habitable accommodation

Planning Permission (Full) North Ayrshire
9 Oct 2026 Pending Consideration 26/00696/PP

Site To West Of Whinhurst Lodge Portencross West Kilbride North Ayrshire

Revised design for proposed house and garage approved under planning permission ref: 24/00640/PP

Planning Permission (Full) North Ayrshire
9 Oct 2026 Pending Consideration 26/00694/LUP

Trollglen Montgomerie Drive Skelmorlie North Ayrshire PA17 5AG

Internal alterations including formation of new window, flue and conversion of existing window to french doors

Lawful Use / Development - Proposed North Ayrshire
9 Oct 2026 Pending Consideration 26/00689/PP

40 Caldon Road Irvine North Ayrshire KA12 0RF

Siting of 1 no. 20ft shipping container to rear of shop and erection of 2.1m high timber screen fence

Planning Permission (Full) North Ayrshire
9 Oct 2026 Pending Consideration 26/00687/PP

25 Eglinton Street Saltcoats North Ayrshire KA21 5DE

Erection of single storey extension to rear of dwelling house

Planning Permission (Full) North Ayrshire
9 Oct 2026 Pending Consideration 26/00685/PP

30 Hauplands Way West Kilbride North Ayrshire KA23 9GB

Formation of balcony to rear of semi-detached dwelling house and extension of existing raised platform at ground floor french doors and addition of ne...

Planning Permission (Full) North Ayrshire
5 Oct 2026 Pending Consideration 26/00673/PP

Unit 2 Eglinton Workshops Kilwinning North Ayrshire

Installation of a freestanding outdoor sauna and timber privacy fencing to rear of existing gym

Planning Permission (Full) North Ayrshire
5 Oct 2026 Pending Consideration 26/00662/PP

48 Alexander Avenue Largs North Ayrshire KA30 9EU

Erection of extension to rear and front of end terraced dwelling house

Planning Permission (Full) North Ayrshire
2 Oct 2026 Pending Consideration 26/00653/LBC

The Royal Bank Of Scotland Plc Invercloy Road Brodick Isle Of Arran North Ayrshire KA27 8AP

Removal of internal partition walls, installation of new partition wall and doors, replacement of glass windowpanes

Listed Building Consent North Ayrshire
28 Sept 2026 Pending Consideration 26/00647/PP

8 Bankhouse Avenue Largs North Ayrshire KA30 9PG

Installation of flue on the western roof plane of a detached dwelling

Planning Permission (Full) North Ayrshire
28 Sept 2026 Pending Consideration 26/00646/PP

Monawilline Cottage Clauchlands Road Lamlash Brodick Isle Of Arran North Ayrshire KA27 8JY

Application to amend design of planning permission 26/00178/PP, including increase of ridge height

Planning Permission (Full) North Ayrshire
28 Sept 2026 Pending Consideration 26/00585/PP

33 Ferry Road Millport Isle Of Cumbrae North Ayrshire KA28 0DZ

Erection of extension to front and extension to rear of semi-detached dwelling house

Planning Permission (Full) North Ayrshire
25 Sept 2026 Approved 2 Oct 26/00659/LUP

77 High Road Stevenston North Ayrshire KA20 3DZ

Alterations and conversion of detached garage to form habitable accommodation incidental to the dwelling house

Lawful Use / Development - Proposed North Ayrshire
25 Sept 2026 Pending Consideration 26/00657/PP

33 Watson Terrace Irvine North Ayrshire KA12 0HZ

Erection of detached garage to side of semi-detached dwelling house

Planning Permission (Full) North Ayrshire
25 Sept 2026 Approved 23 Oct 26/00656/PP

Pencorse Portencross West Kilbride North Ayrshire KA23 9QA

Erection of single storey extension to side of detached dwelling house

Planning Permission (Full) North Ayrshire
25 Sept 2026 Pending Consideration 26/00655/PP

7 Chapelton Drive Largs North Ayrshire KA30 8RD

Erection of garage extension to side of detached dwelling house

Planning Permission (Full) North Ayrshire
23 Sept 2026 Pending Consideration 26/00635/PP

The Barn 2 Mid Lambroughton Farm Kilmarnock North Ayrshire KA3 2PL

Erection of detached double garage within curtilage of dwellinghouse

Planning Permission (Full) North Ayrshire
23 Sept 2026 Approved 20 Oct 26/00643/PP

33 Raillies Avenue Largs North Ayrshire KA30 8QY

Erection of single storey extension to side of detached dwelling house

Planning Permission (Full) North Ayrshire
23 Sept 2026 Pending Decision 26/00644/PP

25 Bay Street Fairlie Largs North Ayrshire KA29 0AL

Alterations and replacement balconies to the rear of an existing semi-detached dwellinghouse

Planning Permission (Full) North Ayrshire
22 Sept 2026 Pending Consideration 26/00641/PP

24 Shore Road Skelmorlie North Ayrshire PA17 5DR

Alterations and extension to the side of detached dwellinghouse

Planning Permission (Full) North Ayrshire
17 Sept 2026 Approved 1 Oct 26/00576/LUP

5 Garrett Avenue Saltcoats North Ayrshire KA21 6GT

External alterations to facilitate garage conversion

Lawful Use / Development - Proposed North Ayrshire
17 Sept 2026 Pending Consideration 26/00624/PP

St Quivox Whiting Bay Brodick Isle Of Arran North Ayrshire KA27 8QH

Enlargement of dormer window to front and erection of single storey extension to front of detached dwelling house

Planning Permission (Full) North Ayrshire
17 Sept 2026 Pending Consideration 26/00623/LBC

154 - 156 High Street Irvine North Ayrshire KA12 8AN

Alterations to include the erection of external flue, the erection of external staircase and associated internal and external works

Listed Building Consent North Ayrshire
16 Sept 2026 Pending Decision 26/00476/PP

Muirside Lodge Stevenston Road Kilwinning North Ayrshire KA13 6NQ

Erection of single storey rear extension and external alterations to office building

Planning Permission (Full) North Ayrshire
11 Sept 2026 Approved 15 Oct 26/00587/PP

1 Mcdowall Avenue Ardrossan North Ayrshire KA22 7AJ

Erection of detached single storey garden room (retrospective)

Planning Permission (Full) North Ayrshire
11 Sept 2026 Withdrawn 8 Oct 26/00610/LUP

25 Eglinton Street Saltcoats North Ayrshire KA21 5DE

Erection of single storey extension to rear of dwelling house

Lawful Use / Development - Proposed North Ayrshire
11 Sept 2026 Approved 19 Oct 26/00611/PP

Meikle Auchengree Auchengree Road Glengarnock Beith North Ayrshire KA14 3BU

Erection of extension to form kitchen, office and store

Planning Permission (Full) North Ayrshire
7 Sept 2026 Approved 6 Oct 26/00566/PP

Croyde Alma Road Brodick Isle Of Arran North Ayrshire KA27 8AZ

Demolition of existing side extensions with replacement single side extension

Planning Permission (Full) North Ayrshire
7 Sept 2026 Approved 20 Oct 26/00602/PP

5 Montgomerie Crescent Fairlie Largs North Ayrshire KA29 0EB

Alterations to enlarge dormer window and erection of extension to west side of existing rear extension

Planning Permission (Full) North Ayrshire
3 Sept 2026 Approved 2 Oct 26/00589/PP

5 Bowfield Road West Kilbride North Ayrshire KA23 9LB

Demolition of existing garage with replacement detached double garage

Planning Permission (Full) North Ayrshire
2 Sept 2026 Approved 22 Oct 26/00594/PP

12 Carson Drive Irvine North Ayrshire KA12 8HR

Erection of first floor balcony (to south side elevation) to include associated door opening; construction of raised rear terrace with associated step...

Planning Permission (Full) North Ayrshire
1 Sept 2026 Pending Consideration 26/00588/PP

Ardtalla Whiting Bay Brodick Isle Of Arran North Ayrshire KA27 8PZ

Formation of upper extension to enlarge dormer window on rear elevation of detached dwelling house

Planning Permission (Full) North Ayrshire
31 Aug 2026 Approved 23 Oct 26/00579/PP

9 Torr Righe Shiskine Brodick Isle Of Arran North Ayrshire KA27 8HD

Erection of extension

Planning Permission (Full) North Ayrshire
31 Aug 2026 Approved 8 Oct 26/00586/PP

The Sheans Whiting Bay Brodick Isle Of Arran North Ayrshire KA27 8QL

Erection of extension to side, including attic conversion to form two dormers to front and erection of detached garage

Planning Permission (Full) North Ayrshire
27 Aug 2026 Approved 9 Sep 26/00499/LUP

49 Lomond Crescent Beith North Ayrshire KA15 2EB

External alterations to front of dwellinghouse to facilitate the conversion of integral garage to habitable accommodation

Lawful Use / Development - Proposed North Ayrshire
27 Aug 2026 Approved 15 Oct 26/00572/PP

32 The Paddock Perceton Irvine North Ayrshire KA11 2AZ

Formation of 2 no. additional window openings to the rear elevation and 1 no. window opening to the side elevation of detached dwelling house includin...

Planning Permission (Full) North Ayrshire
26 Aug 2026 Refused 25 Sep 26/00511/PP

40 Caldon Road Irvine North Ayrshire KA12 0RF

Siting of 1 no. 20ft shipping container to rear of shop

Planning Permission (Full) North Ayrshire
26 Aug 2026 Approved 19 Oct 26/00558/PP

36 Murray Crescent Lamlash Brodick Isle Of Arran North Ayrshire KA27 8NS

Raising of the roof ridge height, erection of an extension to the rear and a front porch to a detached dwelling house

Planning Permission (Full) North Ayrshire
26 Aug 2026 Pending Consideration 26/00570/PP

16 Shore Road Skelmorlie North Ayrshire PA17 5DY

Alterations and extensions including replacement roof to the poolhouse. Installation of PV panels to roof. Erection of annex extension to poolhouse. E...

Planning Permission (Full) North Ayrshire
26 Aug 2026 Pending Consideration 26/00571/LBC

16 Shore Road Skelmorlie North Ayrshire PA17 5DY

Internal alterations and repair works to dwellinghouse including installation of PV panels to roof. Alterations and extension including replacement ro...

Listed Building Consent North Ayrshire
26 Aug 2026 Approved 23 Oct 26/00574/PP

Kelp Cottage Harbour View Blackwaterfoot Isle Of Arran North Ayrshire KA27 8HG

Formation of dormer extensions to rear of detached dwelling house

Planning Permission (Full) North Ayrshire
21 Aug 2026 Approved 14 Oct 26/00561/PP

13 Jacks View West Kilbride North Ayrshire KA23 9HX

Erection of garden room

Planning Permission (Full) North Ayrshire
Recency
Last 2 weeks
2-4 weeks
1-2 months
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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 North Ayrshire?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by North Ayrshire. You can also narrow the alert to a postcode, street, or drawn area.

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