House extensions in Lisburn and Castlereagh

Lisburn and Castlereagh received 263 householder applications in the last 12 months - about 5 a week. Garage works and rear extensions are the most common. Of the 118 decided so far, 116 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 76 applications
8 Sept 2026 Valid 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 Valid LA05/2026/0707/F

19 Pinehill Road, Drumbo, Lisburn, BT27 5TU

Rear dormer extension and alterations to existing dwelling

Full Lisburn And Castlereagh
2 Sept 2026 Consultation Open 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 Consultation Open LA05/2026/0697/F

12 Culross Place, Belfast, BT16 2SN

Proposed single storey extension to rear

Full Lisburn And Castlereagh
1 Sept 2026 Consultation Open LA05/2026/0698/F

1a Hillhead Road, Ballinderry Upper, Lisburn, BT28 2HE

Erection of shed within curtilage of dwelling/house for storage of trailer, horse box, lawnmower etc for domestic use

Full Lisburn And Castlereagh
1 Sept 2026 Site Inspection Complete LA05/2026/0694/F

33 Breton Hall, Lisburn, BT28 3XY

Attic conversion plus single storey rear/side extension to dwelling

Full Lisburn And Castlereagh
28 Aug 2026 Consultation Open LA05/2026/0692/F

19 Ayrshire Meadows, Lisburn, BT28 2DU

Proposed two-storey side extension to existing dwelling.

Full Lisburn And Castlereagh
27 Aug 2026 Consultation Open LA05/2026/0689/F

78 Tullynewbank Road, Glenavy, Crumlin, BT29 4PJ

Proposed replacement of existing outbuilding to provide new garage and storage on the ground floor, games room & home office on the first floor

Full Lisburn And Castlereagh
26 Aug 2026 Consultation Open LA05/2026/0687/F

3 Plantation Road, Lisburn, BT27 5BP

Proposed extension to dwelling to provide ground floor living accommodation

Full Lisburn And Castlereagh
25 Aug 2026 Consultation Open LA05/2026/0685/F

6a Halftown Road, Lisburn, BT27 5RD

Proposed domestic garage and store

Full Lisburn And Castlereagh
25 Aug 2026 Consultation Open LA05/2026/0682/F

13 Breda Park, Belfast, BT8 6JR

Proposed single storey extension to rear and part conversion of existing garage

Full Lisburn And Castlereagh
25 Aug 2026 Consultation Open LA05/2026/0681/F

42 Wanstead Road, Belfast, BT16 2EL

Single storey rear extension

Full Lisburn And Castlereagh
24 Aug 2026 Consultation Open LA05/2026/0671/F

177 Dromara Road, Drumlough, Hillsborough, BT26 6QA

First floor extension to dwelling to provide additional bedrooms (2no.) and bathroom with raised ridge height

Full Lisburn And Castlereagh
22 Aug 2026 Consultation Open LA05/2026/0678/F

35 Edenticullo Road, Hillsborough, BT26 6PH

Proposed refurbishment and alterations to existing 2 storey dwelling, including construction of new garage outbuilding and detached spa building to re...

Full Lisburn And Castlereagh
21 Aug 2026 Consultation Open LA05/2026/0674/LBC

2 Galwally House Drumkeen Complex, Upper Galwally, Belfast, BT8 6FY

Making the building more suitable for disabled users. Reconfiguration of existing toilets to create a disabled complicate WC on the ground floor and c...

Listed Building Consent Lisburn And Castlereagh
19 Aug 2026 Consultation Open LA05/2026/0667/F

10 Monaville Gradens, Tonagh, Lisburn, BT28 2DE

Proposed demolition of existing garage, construction of new single storey side and rear pitched roof extensions and associated site works

Full Lisburn And Castlereagh
19 Aug 2026 Valid LA05/2026/0666/LBC

23 Ballinderry House 23 Lower Ballinderry Road, Ballinderry, Lisburn, BT28 2JH

Demolition and rebuilding/set back of part of existing wall and metal railings to facilitate visibility splay

Listed Building Consent Lisburn And Castlereagh
17 Aug 2026 Consultation Open LA05/2026/0656/F

3 Rural Cottages, Lisburn, BT27 5TW

Proposed single storey rear extensions

Full Lisburn And Castlereagh
14 Aug 2026 Consultation Open LA05/2026/0662/F

15 Ballyregan Avenue, Dundonald, Belfast, BT16 1JW

1st floor Bedrooms extension on top of existing integrated garage and blocking up existing Bathroom window at first floor level to rear of existing dw...

Full Lisburn And Castlereagh
13 Aug 2026 Consultation Open LA05/2026/0670/F

20 Clogher Road, Hillsborough, BT26 6PJ

Refurbishment and extension of existing dwelling to provide improved accessible accommodation for inhabitants

Full Lisburn And Castlereagh
11 Aug 2026 Consultation Open LA05/2026/0652/F

53-55 Bow Street, Lisburn, BT28 1BJ

Refurbishment of the existing two-storey retail property, comprising the replacement of existing windows and shopfront, together with associated inter...

Full Lisburn And Castlereagh
10 Aug 2026 Consultation Open LA05/2026/0653/F

58 Glendale Park, Belfast, BT8 6HS

Attic Conversion with Rear Dormer

Full Lisburn And Castlereagh
10 Aug 2026 Consultation Open LA05/2026/0646/F

11 Rock Road, Lisburn, BT28 3XR

Proposed single storey rear extension to existing dwelling.

Full Lisburn And Castlereagh
10 Aug 2026 Site Inspection Complete LA05/2026/0648/F

102 Hillhall Road, Lisburn, BT27 5BT

Single storey rear extension, renovation and eco-upgrade to dwelling and garage

Full Lisburn And Castlereagh
7 Aug 2026 Consultation Open LA05/2026/0644/F

22 Ogles Grove, Royal Hillsborough, BT26 6RS

single storey extension to rear of existing property to create new kitchen

Full Lisburn And Castlereagh
7 Aug 2026 Consultation Open LA05/2026/0642/F

1 Carsons Lane, Lisburn, BT27 5SH

Proposed re-location of driveway to dwelling & detached garage as approved under planning application LA05/2022/0257/F

Full Lisburn And Castlereagh
6 Aug 2026 Consultation Open LA05/2026/0639/F

Mcculla (Ireland) Ltd, Unit 5 Blaris Industrial Estate, Altona Road, Lisburn, BT27 5QB

Proposed increase in eaves height and extension of existing cold store to include marshalling area and forklift charging, recladding of existing build...

Full Lisburn And Castlereagh
6 Aug 2026 Consultation Open LA05/2026/0638/F

7 Killynure Road West, Belfast, BT8 8EA

Rear single storey extension with first floor balcony

Full Lisburn And Castlereagh
6 Aug 2026 Consultation Open LA05/2026/0640/LBC

6 Purdysburn Village, Belfast, BT8 8LJ

The proposed development comprises minor repairs, alterations, and landscape improvements to the Grade B2 listed cottage to enhance functionality, acc...

Listed Building Consent Lisburn And Castlereagh
5 Aug 2026 Consultation Open LA05/2026/0636/F

49 Ilford Park, Belfast, BT6 9SG

Rear extension and internal refurbishment to existing dwelling

Full Lisburn And Castlereagh
5 Aug 2026 Site Inspection Complete LA05/2026/0637/F

69 Dromara Road, Ballynahinch, BT24 8JW

Single storey rear extension

Full Lisburn And Castlereagh
4 Aug 2026 Consultation Open LA05/2026/0633/F

7 Deramore Crescent, Moira, Craigavon, BT67 0SQ

Rear and side single storey extension

Full Lisburn And Castlereagh
3 Aug 2026 Consultation Open LA05/2026/0627/RM

80m north east adjacent 38 Killultagh Road, Lisburn, BT28 2PS

Site for a replacement dwelling and garage including ancillary siteworks and retention of existing building as outhouse

Reserved Matters Lisburn And Castlereagh
30 Jul 2026 Consultation Open LA05/2026/0623/F

112 Creevy Road, Lisburn, BT27 6UW

Side extension to existing dwelling to provide sun room and study

Full Lisburn And Castlereagh
30 Jul 2026 Valid LA05/2026/0624/F

177 Dromara Road, Royal Hillsborough, BT2 6QA

First floor extension to dwelling to provide additional bedrooms (2no) and bathroom

Full Lisburn And Castlereagh
30 Jul 2026 Consultation Open LA05/2026/0612/F

24 Lenaghan Avenue, Belfast, BT8 7JF

Conversion of the existing attached garage to form two habitable rooms ancillary to the dwelling, including associated internal alterations and repla...

Full Lisburn And Castlereagh
30 Jul 2026 Valid LA05/2026/0618/NMC

Lands South of No's 2-10 Ballantine Walk and East of No's 22-42 Mount Royal, Lisburn

This application seeks non-material changes to the Coach House A house type (Plots 383 and 384 of planning approval S/2011/0383/F) comprising: a) rep...

Non Material Change Lisburn And Castlereagh
30 Jul 2026 Valid LA05/2026/0619/NMC

Lands South of No's 2-10 Ballantine Walk and east of No's 22-42 Mount Royal, Lisburn

Proposed non-material amendment to planning permission S/2011/0383/F (Appeal Ref : 2011/A0263) comprising minor external and internal alterations to f...

Non Material Change Lisburn And Castlereagh
28 Jul 2026 Consultation Open LA05/2026/0593/F

81 Ballynahinch Road, Belfast, BT8 8DP

Erection of entrance pillars, installation of sliding entrance gate and relocation of pedestrian gate and pathway into site.

Full Lisburn And Castlereagh
27 Jul 2026 Site Inspection Complete LA05/2026/0610/F

25 Carrisbrook Gardens, Lisburn, BT27 4PN

Conversion of garage plus extension to provide ancillary accommodation to be used in association with existing dwelling

Full Lisburn And Castlereagh
25 Jul 2026 Under Consideration LA05/2026/0617/F

20 Myrtledene Road, Belfast, BT8 6GQ

Addition of single storey flat roof dining extension to the rear of the property, along with the renovation/modification of the existing flat roof to ...

Full Lisburn And Castlereagh
24 Jul 2026 Consultation Open LA05/2026/0606/F

69 Wellington Park Drive, Lisburn, BT67 0UP

Proposed rear/side extension to form family room

Full Lisburn And Castlereagh
20 Jul 2026 Consultation Open LA05/2026/0601/F

3 Meadowside, Glenavy, Crumlin, BT29 4FE

Ground Floor Rear Bedroom & Shower Room Extension with level access ramp.

Full Lisburn And Castlereagh
20 Jul 2026 Site Inspection Complete LA05/2026/0598/F

13 Richmond Court, Lisburn, BT27 4QU

Internal alterations and loft conversion which includes dormer extension to rear.

Full Lisburn And Castlereagh
20 Jul 2026 Site Inspection Complete LA05/2026/0600/F

8 Llewellyn Avenue, Lisburn, BT27 4AG

Proposed single Storey Extension to rear, Rear Flat roof change to a pitched roof and ground floor rear facade changes

Full Lisburn And Castlereagh
17 Jul 2026 Consultation Open LA05/2026/0597/F

4 Beechill Park East, Belfast, BT8 6NX

Retrospective amendment to the design of the approved detached garage and proposed change of material finish on the house extension. (Planning Approva...

Full Lisburn And Castlereagh
16 Jul 2026 Site Inspection Complete LA05/2026/0595/F

Jacksons Of Moira 98 to 100 Main Street, Moira, Craigavon, BT67 0LH

Retrospective application for extensions to existing retail premises

Full Lisburn And Castlereagh
15 Jul 2026 Site Inspection Complete LA05/2026/0592/F

24 Magheralave Court, Lisburn, BT28 3BY

Proposed Single Storey Side Extension

Full Lisburn And Castlereagh
10 Jul 2026 Site Inspection Complete LA05/2026/0602/F

126 Magheraconluce Road, Hillsborough, BT26 6PL

Single storey rear extension to provide, bedroom, ensuite, living/kitchen/dining space

Full Lisburn And Castlereagh
10 Jul 2026 Consultation Open LA05/2026/0586/F

46d Gransha Road, Belfast, BT16 2HD

Attic conversion

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.