House extensions in Lisburn and Castlereagh

Lisburn and Castlereagh received 319 householder applications in the last 12 months - about 6 a week. Garage works and rear extensions are the most common. Of the 155 decided so far, 153 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 85 applications
23 Oct 2026 Valid LA05/2026/0827/F

1 Old Mill Grove, Dundonald, Belfast, BT16 1WB

Single storey extension to rear of existing dwelling

Full Lisburn And Castlereagh
22 Oct 2026 Valid LA05/2026/0823/F

22 Iniscarn Park, Lisburn, BT28 2BL

Proposed single storey rear extension to provide 2no additional bedrooms and bathroom

Full Lisburn And Castlereagh
22 Oct 2026 Valid LA05/2026/0826/F

40 Fairfields Glen, Lisburn, BT28 3QL

Removal of existing side timber fence and provision of new 1800mm vertical board timber fencing

Full Lisburn And Castlereagh
22 Oct 2026 Valid LA05/2026/0825/F

2 2 Crommelin Place, Lisburn, BT28 1YL

Proposed single storey extension to side of dwelling with internal alterations and level access to front of dwelling.

Full Lisburn And Castlereagh
21 Oct 2026 Valid LA05/2026/0822/F

73 Hillsborough Road, Carryduff, BT8 8HT

Erection of single storey garage and extension to residential curtilage

Full Lisburn And Castlereagh
21 Oct 2026 Valid LA05/2026/0819/F

Sextons House, Main Street, Hillsborough, BT26 6AE

Refurbishment and internal alteration of Sexton’s House to facilitate its continued use as a multi-purpose community hall with tea and coffee faciliti...

Full Lisburn And Castlereagh
19 Oct 2026 Valid LA05/2026/0816/F

20 Sir Richard Wallace View, Lisburn, BT28 3NY

Proposed double storey side and single storey rear extension to provide additional ensuite bedroom on first floor and bigger kitchen with utility and ...

Full Lisburn And Castlereagh
17 Oct 2026 Consultation Open LA05/2026/0818/F

39 Garland Hill, Belfast, BT8 6YL

Single storey rear extension to existing dwelling

Full Lisburn And Castlereagh
16 Oct 2026 Valid LA05/2026/0811/F

14 St. Johns Park, Moira, BT67 0NL

Demolition of detached garage and construction of utility and dining room extension to rear of dwelling

Full Lisburn And Castlereagh
15 Oct 2026 Consultation Open LA05/2026/0805/F

40 Greenwood Glen, Belfast, BT8 7WE

single storey rear and side extension

Full Lisburn And Castlereagh
15 Oct 2026 Valid LA05/2026/0809/F

11a Chapel Road, Glenavy, Crumlin, BT29 4LY

2 storey side extension with front balcony and stone cladding to front entrance - Renewal of Planning Approval LA05/2021/1164/F

Full Lisburn And Castlereagh
13 Oct 2026 Valid LA05/2026/0810/NMC

Lands formerly occupied by the Rolls Royce factory north of Upper Newtownards south of Inspire Business…

Non-material change to planning approval LA05/2021/0033/F altering the elevational finish to brickwork.

Non Material Change Lisburn And Castlereagh
13 Oct 2026 Consultation Open LA05/2026/0799/F

118 Low Road, Lisburn, BT27 4TN

Proposed single storey extension to side of property with internal alterations

Full Lisburn And Castlereagh
13 Oct 2026 Consultation Open LA05/2026/0800/F

19 Milltown Crescent, Lisburn, BT28 3TX

Proposed single storey extension to rear of dwelling

Full Lisburn And Castlereagh
12 Oct 2026 Consultation Open LA05/2026/0797/F

26 Belfast Road, Lisburn, BT27 4AS

Formation of new pedestrian access to existing basement area at front of dwelling comprising retaining walls, railings and steps and alterations to ex...

Full Lisburn And Castlereagh
12 Oct 2026 Valid LA05/2026/0796/F

3 Greenvale, Belfast, BT17 9LR

Proposed single storey rear extension and refurbishment of existing garage for domestic purposes within the curtilage of 3 Greenvale Dunmurry.

Full Lisburn And Castlereagh
11 Oct 2026 Valid LA05/2026/0792/F

51 Bracken Hill Close, Knockbreckan, Belfast, BT8 6ZR

Proposed rear single storey kitchen/dining extension and installation of ground floor window in existing side elevation

Full Lisburn And Castlereagh
11 Oct 2026 Consultation Open LA05/2026/0793/F

19 Carrowreagh Gardens, Belfast, BT16 1TW

Proposed garage conversion to provide en-suite and store.

Full Lisburn And Castlereagh
9 Oct 2026 Consultation Open LA05/2026/0791/F

40 Breda Park, Belfast, BT8 6JR

Demolition of existing single storey rear return and construction of new single storey kitchen and living extension

Full Lisburn And Castlereagh
7 Oct 2026 Consultation Open LA05/2026/0785/F

40 Magheralave Park East, Lisburn, BT28 3BT

Single-storey extension to rear, demolition of existing sun room, and elevational changes to existing dwelling.

Full Lisburn And Castlereagh
6 Oct 2026 Consultation Open LA05/2026/0784/F

39 The Meadows, Moira, Craigavon, BT67 0JY

Rear sun-room extension to semi-detached bungalow

Full Lisburn And Castlereagh
6 Oct 2026 Consultation Open LA05/2026/0779/F

33 Garvey Manor, Lisburn, BT27 4DQ

Two storey side extension

Full Lisburn And Castlereagh
6 Oct 2026 Consultation Open LA05/2026/0781/F

19 Hunter's Chase, Lower Ballinderry, Lisburn, BT28 2BJ

Single storey side and rear extension to dwelling

Full Lisburn And Castlereagh
2 Oct 2026 Consultation Open LA05/2026/0777/F

2 Antrim Road, Lisburn, BT28 3DH

Proposed detached single storey garage and garden room

Full Lisburn And Castlereagh
1 Oct 2026 Valid LA05/2026/0774/F

51 Dundrum Road, Dromore, BT25 2JH

Proposed single storey extension to front of property with internal alterations and level access to rear of property.

Full Lisburn And Castlereagh
1 Oct 2026 Site Inspection Complete LA05/2026/0775/F

21 Fairfields Glen, Lisburn, BT28 3QL

Proposed two storey extension to the side of existing dwelling

Full Lisburn And Castlereagh
30 Sept 2026 Consultation Open LA05/2026/0773/F

41 Rosneath Gardens, Belfast, BT16 1UN

New porch to front and rear extension

Full Lisburn And Castlereagh
30 Sept 2026 Consultation Open LA05/2026/0771/F

40 Ashbourne Park, Lisburn, BT27 4NS

Internal alterations and 2 storey gable extension to provide enlarged kitchen and snug at ground floor; enlarged bathroom and bedroom at first floor l...

Full Lisburn And Castlereagh
29 Sept 2026 Site Inspection Complete LA05/2026/0766/F

12 Carrisbrook Gardens, Lisburn, BT27 4PN

Level access and extending existing hardstand at front of property

Full Lisburn And Castlereagh
29 Sept 2026 Site Inspection Complete LA05/2026/0769/F

8 Thorndale Road South, Belfast, BT8 8HN

Demolition of existing rear extension and dormer, addition of two storey basement and ground floor extension. Existing brick and proposed extension to...

Full Lisburn And Castlereagh
29 Sept 2026 Consultation Open LA05/2026/0763/LBC

Sextons House, Main Street, Hillsborough, BT26 6AE

Refurbishment and internal alteration of Sexton’s House to facilitate its continued use as a multi-purpose community hall with tea and coffee faciliti...

Listed Building Consent Lisburn And Castlereagh
27 Sept 2026 Site Inspection Complete LA05/2026/0755/F

84 Linen Green, Lisburn, BT28 3NZ

Proposed single-storey extension to the rear, the conversion and extension to the existing garage to provide living accommodation and alteration to fr...

Full Lisburn And Castlereagh
24 Sept 2026 Consultation Open LA05/2026/0754/F

Site 12 metres north west of 39 Quarterlands Road, Drumbeg

Proposed conversion and re-use of non-listed vernacular buildings for use as a dwelling with provision of a detached garage and master bedroom annex w...

Full Lisburn And Castlereagh
23 Sept 2026 Consultation Open LA05/2026/0753/F

5 Braithwaites Road, Lisburn, BT28 3SW

Proposed single storey rear extension and internal alterations including: new bedroom, en-suite, dressing room, utility and extended seating area to k...

Full Lisburn And Castlereagh
22 Sept 2026 Site Inspection Complete LA05/2026/0745/F

71 Ballylintagh Road, Annahilt, BT26 6QQ

Single storey rear extension

Full Lisburn And Castlereagh
21 Sept 2026 Site Inspection Complete LA05/2026/0743/F

48 Riverdale, Hillsborough, BT26 6DH

Conversion of integral garage to bedroom and shower room

Full Lisburn And Castlereagh
18 Sept 2026 Site Inspection Complete LA05/2026/0737/F

4 Cadger Road, Belfast, BT8 8AU

Single storey rear extension to provide open plan kitchen, living and dining areas

Full Lisburn And Castlereagh
17 Sept 2026 Site Inspection Complete LA05/2026/0733/F

12 Mullaghglass Road, Lisburn, BT28 3TG

Retention of existing domestic garage with extension and alterations

Full Lisburn And Castlereagh
15 Sept 2026 Site Inspection Complete LA05/2026/0726/F

The Demesne and lands adjacent to 82 The Demesne, Carryduff, BT8 8GU

Proposed dwelling with associated car parking and landscaping, alteration of curtilage to existing dwelling at 82 The Demesne and extension to existin...

Full Lisburn And Castlereagh
14 Sept 2026 Site Inspection Complete LA05/2026/0728/F

Glenmount Farm, 18 Thorndale Road, Dundrod, Crumlin, BT29 4UD

Proposed single storey detached garden room at 18 Thorndale Road along with minor extension to existing curtilage, adjustment to ground levels and ass...

Full Lisburn And Castlereagh
14 Sept 2026 Site Inspection Complete LA05/2026/0730/F

Shannon Clinic Building, Knockbracken Healthcare Park, Saintfield Road, Belfast

Extension of existing Shannon Building to accommodate new seclusion suites, de-escalation room, waiting area and link corridor to adjacent ward wing. ...

Full Lisburn And Castlereagh
14 Sept 2026 Site Inspection Complete LA05/2026/0727/F

76c Tirowen Drive, Lisburn, BT28 1SD

Single storey rear extension to provide accessible bedroom for person with disabilities.

Full Lisburn And Castlereagh
14 Sept 2026 Valid LA05/2026/0724/NMC

Units 1-6, 160 Moira Road, Lisburn, BT28 1JB

Amendments to granted elevations (LA05/2022/0830/F) regarding Units 1 – 6:- 1. Amend the roof; remove internal gutters and parapets on the front ele...

Non Material Change Lisburn And Castlereagh
11 Sept 2026 Site Inspection Complete LA05/2026/0716/F

6 Tynedale Crescent, Lisburn, BT28 3JY

Single storey rear kitchen and dining room extension. Attic conversion including new rear dormer

Full Lisburn And Castlereagh
11 Sept 2026 Consultation Open LA05/2026/0717/F

Emmanuel Baptist Church, 6 Glenavy Road, Lisburn, BT28 3QW

Proposed extension of existing church car park to include additional car parking spaces, replacement boundary fencing and associates landscaping works

Full Lisburn And Castlereagh
9 Sept 2026 Site Inspection Complete LA05/2026/0715/F

2 Cairnshill Road, Belfast, BT8 6GG

Proposed Replacement Garage. Enlargement of previously approved garage under LA05/2022/0338/F

Full Lisburn And Castlereagh
8 Sept 2026 Site Inspection Complete LA05/2026/0710/F

42 Barrack Hill, Stoneyford, Lisburn, BT28 3WL

Proposed first floor bedroom extension over existing garage and the conversation of existing garage to a utility room and lounge

Full Lisburn And Castlereagh
8 Sept 2026 Consultation Open LA05/2026/0707/F

19 Pinehill Road, Drumbo, Lisburn, BT27 5TU

Rear dormer extension and alterations to existing dwelling

Full Lisburn And Castlereagh
4 Sept 2026 Site Inspection Complete LA05/2026/0701/F

3 Breda Park, Belfast, BT8 6JR

Construction of a two storey extension to gable and single storey extension to rear of existing property together with associated site works and lands...

Full Lisburn And Castlereagh
2 Sept 2026 Site Inspection Complete LA05/2026/0697/F

12 Culross Place, Belfast, BT16 2SN

Proposed single storey extension to rear

Full Lisburn And Castlereagh
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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 Lisburn and Castlereagh?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Lisburn and Castlereagh. You can also narrow the alert to a postcode, street, or drawn area.

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