House extensions in Cornwall

Cornwall received 1,287 householder applications in the last 12 months - about 25 a week. Garage works and rear extensions are the most common. Of the 896 decided so far, 854 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 457 applications
2 days ago Awaiting decision PA26/06053

Mingoose Vean Barn Towan Cross Mount Hawke Truro Cornwall TR4 8BX

Proposed first floor extension to form an additonal ensuite bedroom to the existing dwelling and alterations to the existing dwelling.

Full application Cornwall
10 Sept 2026 Awaiting decision PA26/06091

17 Boscawen Street Truro Cornwall TR1 2QZ

Replacement of principal entrance doors and installation of new CCTV camera above side entrance door

Full application Cornwall
9 Sept 2026 Awaiting decision PA26/06025

Sunnyside Cottage 74 Goonown St Agnes Cornwall TR5 0XG

The removal of an existing single-storey rear utility addition and the construction of a two-storey rear extension with an adjoining single-storey ele...

Full application Cornwall
9 Sept 2026 Awaiting decision PA26/06049

Currahee Tresevern Hill Goonlaze Stithians Truro Cornwall TR3 7AP

Erection of a detached single garage.

Full application Cornwall
9 Sept 2026 Awaiting decision PA26/05993

37 Polkyth Road St Austell Cornwall PL25 4LP

Outbuillding used as an annexe.

Full application Cornwall
8 Sept 2026 Awaiting decision PA26/06078

1 St Saviours Lane Padstow Cornwall PL28 8BD

Listed Building Consent: Removal of the above-ground outer wall of the existing well to current floor level and installation of heavy-duty reinforced ...

Listed Building Consent Cornwall
8 Sept 2026 Awaiting decision PA26/06077

1 St Saviours Lane Padstow Cornwall PL28 8BD

Removal of the above-ground outer wall of the existing well to current floor level and installation of heavy-duty reinforced glass with integrated lig...

Full application Cornwall
8 Sept 2026 Awaiting decision PA26/06001

Trehunsey Cottage Quethiock Liskeard Cornwall PL14 3SG

Extension to South East Elevation of Dwelling

Full application Cornwall
8 Sept 2026 Awaiting decision PA26/06161

6 Stratton Terrace Truro Cornwall TR1 3EW

Garden Wall Repairs

Full application Cornwall
8 Sept 2026 Awaiting decision PA26/06183

Grosse Point Mount George Road Penelewey Feock Truro Cornwall TR3 6QX

Construction of Outdoor Swimming Pool, Single Storey Incidental Building & Associated Works

Full application Cornwall
7 Sept 2026 Awaiting decision PA26/06211

Trevengy Higher Bosavern St Just Penzance Cornwall TR19 7QZ

Construction of first floor extension and associated works

Full application Cornwall
7 Sept 2026 Awaiting decision PA26/05969

2 Mount Pleasant Street Mousehole Penzance Cornwall TR19 6SA

Repair / part replacement roof structure to rear single storey element including 2No new rooflights, 2No. replacement windows and replacement of roof ...

Application under Section 73 of TCP Act Cornwall
7 Sept 2026 Awaiting decision PA26/06188

16 Praze Road Newquay Cornwall TR7 3DD

Construction of first floor extension and associated works

Full application Cornwall
7 Sept 2026 Awaiting decision PA26/05892

St Brychan Trethevy Tintagel Cornwall PL34 0BE

Replacement of existing eastern buildings with a 2 storey extension

Full application Cornwall
4 Sept 2026 Awaiting decision PA26/06181

4 Pleasant Terrace St Just Penzance Cornwall TR19 7JG

Two storey rear extension to replace existing single storey extension and construction of a detached ancillary building.

Full application Cornwall
4 Sept 2026 Awaiting decision PA26/06171

Seabreeze 5 The Buildings Station Road Long Rock Penzance Cornwall TR20 9TT

Extension with External and Internal Improvements of Dwelling & Associated Works

Full application Cornwall
4 Sept 2026 Awaiting decision PA26/06167

Apple Tree Cottage Laity Moor Ponsanooth Truro Cornwall TR3 7HR

Single storey extension to side of the dwelling including balcony extension.

Full application Cornwall
4 Sept 2026 Awaiting decision PA26/06166

Land At Swallows Court Ladock TR2 4QD

Prior notification of agricultural or forestry development for: Erection of extension to existing agricultural building for straw, hay and machinery/i...

Agricultural/Forestry prior notification Cornwall
4 Sept 2026 Awaiting decision PA26/05906

Tregavarras Farm Cottage Gorran St Austell Cornwall PL26 6LN

Internal & external repair & refurbishment

Full application Cornwall
3 Sept 2026 Awaiting decision PA26/05902

2 Anthony Road Newquay Cornwall TR7 2AS

Construction of an accessible lift from the lower ground driveway to the living room entrance at ground level, including associated works to the exist...

Full application Cornwall
3 Sept 2026 Awaiting decision PA26/05952

3 Silvershell Road Port Isaac Cornwall PL29 3SN

Proposed extension to existing annexe, with internal alterations.

Full application Cornwall
3 Sept 2026 Awaiting decision PA26/06026

23 Penair Crescent Truro Cornwall TR1 1YS

Proposed installation of a conservatory to the rear of the property

Full application Cornwall
2 Sept 2026 Awaiting decision PA26/05878

The Deck House Trebetherick Wadebridge Cornwall PL27 6SB

Side extension

Full application Cornwall
2 Sept 2026 Awaiting decision PA26/05936

The Couplings Idless Lane Shortlanesend Truro Cornwall TR4 9DE

Extension to front of existing bungalow

Full application Cornwall
2 Sept 2026 Awaiting decision PA26/05897

43 Boslandew Hill Paul Penzance Cornwall TR19 6UD

Prior notification for a larger home extension namely a rear extension

General Permitted Development Extensions Cornwall
2 Sept 2026 Awaiting decision PA26/05890

4 Roseveare Drive Gothers St Dennis St Austell Cornwall PL26 8GY

Proposed Sand School and Tack Room for private use

Full application Cornwall
1 Sept 2026 Awaiting decision PA26/06081

7 Dorset Park Boyton Launceston Cornwall PL15 9RF

Demolition of single storey extension, construction of new two-storey extension and replacement conservatory roof with associated services and decking...

Application under Section 73 of TCP Act Cornwall
1 Sept 2026 Awaiting decision PA26/06095

Treskilling Farm Treskilling Luxulyan Bodmin Cornwall PL30 5EL

To extend to the east elevation of the dwelling overlooking the primary amenity space and to construct a garage in the driveway.

Full application Cornwall
1 Sept 2026 Awaiting decision PA26/00896/PREAPP

2 Newquay Road Truro Cornwall TR1 1RH

Pre application advice for demolition of the existing detached garage and erection of a replacement two storey ancillary family annexe, this will prov...

Pre-Application Publicly Available Cornwall
1 Sept 2026 Awaiting decision PA26/05754

Trehaven New Polzeath Wadebridge Cornwall PL27 6UG

Proposed extensions and improvements to existing dwelling

Full application Cornwall
28 Aug 2026 Awaiting decision PA26/06036

Communication Centre Sennen Penzance Cornwall TR19 7AP

Change of use of a building to a permanently occupied dwellinghouse and associated changes to fenestration

Full application Cornwall
28 Aug 2026 Awaiting decision PA26/06043

Higher Rosecraddoc Cottage Rosecraddoc Liskeard Cornwall PL14 5AE

Partial demolition of cottage, construction of a two storey extension, a single storey extension and a roof canopy over a patio

Full application Cornwall
28 Aug 2026 Awaiting decision PA26/06021

Bay House Porthcothan Padstow Cornwall PL28 8LW

Proposed Alterations and extensions to dwelling

Full application Cornwall
28 Aug 2026 Awaiting decision PA26/05784

8 Broadclose Hill Bude Cornwall EX23 8EQ

Side and rear single storey extension, alterations to existing single storey extension roof arrangement, front canopy, garage conversion (to form part...

Full application Cornwall
27 Aug 2026 Awaiting decision PA26/02968

Crabbshill Woods Two Waters Foot Cornwall PL14 6HX

Erection of a proposed wooden timber frame shed 3.4m (L) x 1.4 m (B) x 2.4m (H).

Full application Cornwall
27 Aug 2026 Awaiting decision PA26/05206

Trefula House Nursing Home Trefula St Day Redruth Cornwall TR16 5ET

Replacement of windows to the north wing and coach house, together with the removal, replacement and installation of windows to the non-listed buildin...

Full application Cornwall
27 Aug 2026 Awaiting decision PA26/05587

Land Between Nos 4 And 5 Park An Gorsaf Camborne Cornwall TR14 7XL

Erection of private garage for storage of classic car with variation of Condition 2 of decision notice PA24/07479 dated 27.11.2024

Application under Section 73 of TCP Act Cornwall
27 Aug 2026 Awaiting decision PA26/05717

30 Bede Haven Close Bude Cornwall EX23 8QF

Convert garage to habitable accommodation, with new window opening to front facade, and new door to side. Installation of a wood burning stove with fl...

Full application Cornwall
27 Aug 2026 Awaiting decision PA26/05987

91 Little Oaks Penryn Cornwall TR10 8RX

Proposed single storey side extension

Full application Cornwall
26 Aug 2026 Awaiting decision PA26/05105

The Bike Chain 82 Mount Ambrose Redruth Cornwall TR15 1QR

Proposed conversion and extension of existing class E buildings to 4no. residential dwellings

Full application Cornwall
26 Aug 2026 Awaiting decision PA26/00916/PREAPP

Jassamine Greenwith Hill Perranwell Station Truro Cornwall TR3 7PP

Pre application advice for retention of alterations to previously approved refurbishments, extensions and associated works (PA23/05046 and PA23/05047)

Pre-Application Publicly Available Cornwall
26 Aug 2026 Awaiting decision PA26/05804

Alexandra Inn Alexandra Road Penzance Cornwall TR18 4LY

Vehicle access, proposed pavement crossover and creation of a staff parking area separated from beer garden with new fence

Full application Cornwall
26 Aug 2026 Awaiting decision PA26/05824

3 Adams Crescent Torpoint Cornwall PL11 2DP

Certificate of Lawfulness for Proposed conversion of existing car port and construction of side extension

Cert Lawfulness - proposed dev/use Cornwall
26 Aug 2026 Awaiting decision PA26/05840

Annexe At Higher Sutton Town Farm Yeolmbridge Launceston Cornwall PL15 8NJ

Erection of residential annexe and workshop on site of former garage and workshop (previously commenced without consent) with variation of Condition 2...

Application under Section 73 of TCP Act Cornwall
25 Aug 2026 Awaiting decision PA26/05913

Trewethern Farm Chapel Amble Wadebridge Cornwall PL27 6ER

Demolition of an existing post-1948 timber barn in disrepair, the construction of a replacement ancillary residential outbuilding and a new connection...

Full application Cornwall
25 Aug 2026 Awaiting decision PA26/05780

Lowena Cottage 20 Belmont Terrace Devoran Truro Cornwall TR3 6PX

Amalgamation of two terraced properties and internal reconfiguration to create one family home. External alterations, including a replacement porch, a...

Full application Cornwall
25 Aug 2026 Awaiting decision PA26/05942

Trenkesten Tregenna Parc St Ives Cornwall TR26 2AT

Rear single storey extension and garage conversion

Full application Cornwall
25 Aug 2026 Awaiting decision PA26/05945

4 Frith Road Saltash Cornwall PL12 6EL

Front and rear single storey extensions with rear decking and internal alterations with variation of Condition 2 of Decision Notice PA24/03713 dated 0...

Application under Section 73 of TCP Act Cornwall
25 Aug 2026 Awaiting decision PA26/05765

The Old Bakery Minnie Place Falmouth Cornwall TR11 3NN

Proposed alterations to existing openings, external finishes and internal layout and construction of shed with variation of conditions 2 and 3 of deci...

Application under Section 73 of TCP Act Cornwall
25 Aug 2026 Awaiting decision PA26/05589

Mariner's Muse Antony Passage Saltash Cornwall PL12 4QT

The provision of a new garage with studio/home office and new balconies to the existing dwelling.

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

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