House extensions in Mid Sussex

Mid Sussex received 817 householder applications in the last 12 months - about 16 a week. Rear extensions and garage works are the most common. Of the 585 decided so far, 550 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 213 applications
Yesterday Pending Consideration DM/26/2627

2 St Francis Close Haywards Heath West Sussex RH16 4JP

Installation of a modular ramp to allow wheelchair access to the property

Householder Application Mid Sussex
Yesterday Pending Consideration DM/26/2318

1 Hickpots Selsfield Road Ardingly Haywards Heath West Sussex RH17 6TJ

Proposed detached garage

Householder Application Mid Sussex
23 Oct 2026 Pending Consideration DM/26/2662

17 Grand Avenue Hassocks West Sussex BN6 8DA

Proposed hip with gable roof extension, new dormer window,

Lawful Development Certificate -Proposed Mid Sussex
23 Oct 2026 Pending Consideration DM/26/2587

1 The Nurseries Balcombe Haywards Heath West Sussex RH17 6JD

Alterations to the downstairs floorplan including moving walls. External alterations involving conversion of windows to doors and doors to windows and...

Householder Application Mid Sussex
23 Oct 2026 Pending Consideration DM/26/2561

34 Valebridge Road Burgess Hill West Sussex RH15 0QY

A 4 metre rear extension with a re-roof and higher ridge with deeper eves.

Householder Application Mid Sussex
21 Oct 2026 Pending Consideration DM/26/2639

8 Woodland Drive Crawley Down Crawley West Sussex RH10 4UF

Proposed single storey side / rear extension

Householder Application Mid Sussex
21 Oct 2026 Pending Consideration DM/26/2629

Corner House Manor Gardens Hurstpierpoint Hassocks West Sussex BN6 9UG

Proposed loft conversion including rear dormer (34m3)

Lawful Development Certificate -Proposed Mid Sussex
20 Oct 2026 Pending Consideration DM/26/2598

9 Perry Avenue East Grinstead West Sussex RH19 2DJ

Proposed single storey rear extension.

Lawful Development Certificate -Proposed Mid Sussex
20 Oct 2026 Pending Consideration DM/26/2609

5 Bignall Grove Hurstpierpoint Hassocks West Sussex BN6 9YN

Proposed side / rear kitchen extension & garage conversion

Householder Application Mid Sussex
19 Oct 2026 Pending Consideration DM/26/2602

5 Railway Cottages Station Approach Horsted Keynes Haywards Heath West Sussex RH17 7BB

Replacement of rear extension pitched glazed roof with insulated zinc roof incorporating two rooflights.

Householder Application Mid Sussex
19 Oct 2026 Pending Consideration DM/26/2142

Land To The Rear Of St Martins 9 Heath Road Haywards Heath West Sussex RH16 3AX

Retrospective application for the retention of existing ancillary buildings and structures together with the proposed erection of additional facilitie...

Full Application Mid Sussex
19 Oct 2026 Pending Consideration DM/26/1551

2 Rockhurst Cottages Ardingly Road West Hoathly East Grinstead West Sussex RH19 4RD

Proposed demolition of existing single storey rear additions. Erection of a two storey side extension and single storey rear extension. Construction o...

Householder Application Mid Sussex
16 Oct 2026 Pending Consideration DM/26/2592

Tiltwood House Hophurst Lane Crawley Down Crawley West Sussex RH10 4LL

Proposed detached garage building to front of house

Householder Application Mid Sussex
16 Oct 2026 Pending Consideration DM/26/2526

23 Downs View Road Hassocks West Sussex BN6 8HJ

Rear single storey extension with flat roof

Householder Application Mid Sussex
16 Oct 2026 Pending Consideration DM/26/2252

103 Barnmead Haywards Heath West Sussex RH16 1XB

Proposed single storey front entrance porch and single storey side extension and alterations.

Householder Application Mid Sussex
15 Oct 2026 Pending Consideration DM/26/2589

9 Furzeland Way Sayers Common Hassocks West Sussex BN6 9JB

Proposed single storey front extension.

Householder Application Mid Sussex
15 Oct 2026 Pending Consideration DM/26/2534

Henley Grange Chapel Road Bolney Haywards Heath West Sussex RH17 5QY

Demolition of existing outbuilding and erection of new domestic incidental building

Lawful Development Certificate -Proposed Mid Sussex
15 Oct 2026 Pending Consideration DM/26/2522

6 Portland Close Haywards Heath West Sussex RH16 3UL

Proposed retention of single storey outbuilding in the rear garden

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2514

16 Reeves Mead Burgess Hill West Sussex RH15 0YR

Retrospective application for a timber children's playhouse with raised play platform.

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2582

The Chapel Chapel Row Selsfield Road West Hoathly East Grinstead West Sussex RH19 4QN

Single storey rear extension.

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2572

3 Awbrook Close Scaynes Hill Haywards Heath West Sussex RH17 7PP

Two storey side extension to replace existing porch, and associated alterations

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2263

Massetts Butterbox Lane Scaynes Hill Haywards Heath West Sussex RH17 7NN

Proposed demolition of an open pole barn and redundant stables. Erection of two detached barns in the same location, one for secure vehicle, equipment...

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2532

51 Backwoods Lane Lindfield Haywards Heath West Sussex RH16 2EL

Single storey side/rear extension and garden room

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2528

Applewood Deanland Road Balcombe Haywards Heath West Sussex RH17 6LX

Proposed two storey side extension, single storey rear extension, roof replacement, internal alteration, new parking and demolition of existing greenh...

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2524

79 Janes Lane Burgess Hill West Sussex RH15 0QP

First floor front hipped roof extension together with formation of a double-height entrance hall

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/2503

The Bay Tree 2 Providence Terrace Lion Lane Turners Hill Crawley West Sussex RH10 4NX

Erection of a lightweight aluminium and glass shelter to the front of The Coffee House Café to create an all-weather dining area.

Full Application Mid Sussex
14 Oct 2026 Withdrawn 14 Oct DM/26/1843

63 Leylands Road Burgess Hill West Sussex RH15 8AF

Proposed construction of a low profile timber framed structure to provide living accommodation for elderly parents.

Householder Application Mid Sussex
14 Oct 2026 Pending Consideration DM/26/1930

38 Inholmes Park Road Burgess Hill West Sussex RH15 0JE

Demolition of existing garage and workshop outbuildings. New two-storey side extension and single-storey rear extension. Roof extension, loft conversi...

Householder Application Mid Sussex
13 Oct 2026 Pending Consideration DM/26/2565

Rocklands Church Lane Ardingly Haywards Heath West Sussex RH17 6UP

First floor rear extension. Replacing a door with a window.

Householder Application Mid Sussex
13 Oct 2026 Pending Consideration DM/26/2564

41 Shelley Road East Grinstead West Sussex RH19 1SX

Proposed two storey side extension, single storey rear extension, conversion of the existing garage into habitable accommodation, and construction of ...

Householder Application Mid Sussex
13 Oct 2026 Pending Consideration DM/26/2507

7 Garden Wood Road East Grinstead West Sussex RH19 1NN

Loft conversion to bedroom and bathroom and alterations to roof to hip to gable and rear dormer with roof lights to front elevations.

Householder Application Mid Sussex
13 Oct 2026 Pending Consideration DM/26/2486

Flat 1 Corrin House 32 Oathall Road Haywards Heath West Sussex RH16 3EQ

Proposed new flat roof with timber roof lantern, removal of the redundant chimney, two new doors, two new windows and a timber porch with plain tiles ...

Full Application Mid Sussex
13 Oct 2026 Pending Consideration DM/26/1715

Belmont Felcot Road Furnace Wood East Grinstead West Sussex RH19 2QA

Alterations to existing dwelling, including removal of existing roof and flat roof rear extension, proposed two storey front extension and additional ...

Householder Application Mid Sussex
12 Oct 2026 Pending Consideration DM/26/2548

7 Sergison Road Haywards Heath West Sussex RH16 1HS

Proposed construction of a front porch extension

Householder Application Mid Sussex
12 Oct 2026 Pending Consideration DM/26/2546

6 Shenstone Lindfield Haywards Heath West Sussex RH16 2PU

Proposed rear dormer

Lawful Development Certificate -Proposed Mid Sussex
12 Oct 2026 Pending Consideration DM/26/2516

9 Portsmouth Wood Close Lindfield Haywards Heath West Sussex RH16 2DQ

Proposed single storey rear extension, part garage conversion and porch to front elevation

Lawful Development Certificate -Proposed Mid Sussex
12 Oct 2026 Pending Consideration DM/26/2491

28 Balcombe Road Haywards Heath West Sussex RH16 1PF

Rear single storey extension with partial pitch and partial flat roof. Infill to external side porch area and new external side door and window. Parti...

Householder Application Mid Sussex
9 Oct 2026 Pending Consideration DM/26/2408

28 Finches Park Road Lindfield Haywards Heath West Sussex RH16 2DN

Part retrospective application for a retrospective outbuilding and store. Proposed conversion to ancillary annexe accommodation and new window (Amende...

Householder Application Mid Sussex
9 Oct 2026 Pending Consideration DM/26/2454

2 Wellcroft Cottages Church Lane Albourne Hassocks West Sussex BN6 9BZ

Retrospective application for the construction of a home office/gym building in the rear garden.

Householder Application Mid Sussex
9 Oct 2026 Pending Consideration DM/26/2530

32 Damian Way Hassocks West Sussex BN6 8BJ

Proposed ground floor rear (south) extension and existing raising garage roof

Householder Application Mid Sussex
9 Oct 2026 Pending Consideration DM/26/2525

Shepherds Farm Turners Hill Road Crawley Down Crawley West Sussex RH10 4HQ

Remove and replace existing kitchen floor.

Listed Building Consent Mid Sussex
9 Oct 2026 Pending Consideration DM/26/2487

8 West Park Road Handcross Haywards Heath West Sussex RH17 6DN

Proposed removal of an existing shed and construction of a replacement building to provide annexed living accommodation for the applicants son.

Householder Application Mid Sussex
9 Oct 2026 Pending Consideration DM/26/2479

21 Harlands Close Haywards Heath West Sussex RH16 1PS

Proposed loft conversion, including a gable end and side dormer, installation of rooflights and associated alterations.

Lawful Development Certificate -Proposed Mid Sussex
8 Oct 2026 Pending Consideration DM/26/2515

Redgate Mill Twineham Lane Twineham Haywards Heath West Sussex RH17 5NP

Proposed removal of existing garage and shipping container and erection of two garden buildings, which will accommodate a home gymnasium and a golf si...

Lawful Development Certificate -Proposed Mid Sussex
8 Oct 2026 Pending Consideration DM/26/2489

20 London Road Balcombe Haywards Heath West Sussex RH17 6PZ

Two storey rear and single storey side extension to existing 2 bedroom detached house including associated demolition works.

Householder Application Mid Sussex
8 Oct 2026 Pending Consideration DM/26/2447

Awbrook Bungalow Ham Lane Scaynes Hill Haywards Heath West Sussex RH17 7PR

Demolition of conservatory and construction of a two storey extension at rear of dwelling.

Householder Application Mid Sussex
8 Oct 2026 Pending Consideration DM/26/2372

37 West Park Road Handcross Haywards Heath West Sussex RH17 6DN

Proposed two storey side extension and single storey front extension.

Householder Application Mid Sussex
8 Oct 2026 Pending Consideration DM/26/1825

1 Whites Close Hurstpierpoint Hassocks West Sussex BN6 9XX

Replacement front porch; single-storey rear extension; replacement side canopy; first-floor rear infill extension with new roof; demolition and rebuil...

Householder Application Mid Sussex
7 Oct 2026 Pending Consideration DM/26/2002

48 Harvest Hill East Grinstead West Sussex RH19 4BT

Renovation of existing garden patio, replacing broken tiles, creating new retaining walls, seating areas, raised beds, perimeter screening and drainag...

Householder Application Mid Sussex
7 Oct 2026 Pending Consideration DM/26/1936

6 Adastra Avenue Hassocks West Sussex BN6 8DL

Demolition of existing garage. Proposed first floor and two storey extensions to bungalow to create chalet style dwelling.(Please note amended descrip...

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

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