House extensions in Cornwall

Cornwall received 2,124 householder applications in the last 12 months - about 41 a week. Garage works and rear extensions are the most common. Of the 1,557 decided so far, 1,486 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 580 applications
Yesterday Awaiting decision PA26/07441

3 St Fimbarrus Road Fowey Cornwall PL23 1JJ

Replacement windows and doors and balustrade to patio

Full application Cornwall
Yesterday Awaiting decision PA26/06977

2 Woodland Road St Austell Cornwall PL25 4QY

Creation of off street parking to front of dwelling, resubmission of lapsed PA22/06249

Full application Cornwall
2 days ago Awaiting decision PA26/07187

Penrose Farm Summercourt Newquay Cornwall TR8 5EE

Internal and external remodelling of an existing dwelling, new side porch extension and demolition of an existing garage for a replacement detached ga...

Full application Cornwall
2 days ago Awaiting decision PA26/07084

Wildfern Harewood Road Calstock Cornwall PL18 9QN

Two small extensions proposed to the existing dwelling - one for additional space in the bedroom and one for a utility and bathroom. Cladding proposed...

Full application Cornwall
2 days ago Awaiting decision PA26/06516

Glyncrest Rawley Lane Newquay Cornwall TR7 2EU

Construction of new dormer extensions, new front porch extension, removal of chimney, removal of conservatory and installation of a raised deck (over ...

Full application Cornwall
2 days ago Awaiting decision PA26/07219

Gooninnis Farm Barn Water Lane St Agnes Cornwall TR5 0RA

Proposed single storey extension and tool shed

Full application Cornwall
2 days ago Awaiting decision PA26/07196

6 Atlantic Way Tintagel Cornwall PL34 0DF

Extend existing balcony to front of property

Full application Cornwall
2 days ago Awaiting decision PA26/07332

The Old Rectory Leathern Bottle Hill Michaelstow Bodmin Cornwall PL30 3PD

Conversion of the existing garage and greenhouse to create a one-bedroom annexe

Full application Cornwall
2 days ago Awaiting decision PA26/07097

Land Opposite Rosebank View Darite Liskeard PL14 5JP

Two shepherds huts for holiday accommodation.

Full application Cornwall
2 days ago Awaiting decision PA26/07043

Midsummer Cottage Poughill Bude Cornwall EX23 9ER

Conversion and extension of existing garage to a one bed annex

Full application Cornwall
2 days ago Awaiting decision PA26/06905

Derowen St Gennys Bude Cornwall EX23 0NX

External alterations to existing rural building, including replacement cladding, lean-to enclosure, WC, drainage and roof-mounted solar panels.

Full application Cornwall
23 Oct 2026 Awaiting decision PA26/07212

8 Millfield Gulval Penzance Cornwall TR18 3DR

Proposed Single Storey Extensions

Full application Cornwall
23 Oct 2026 Awaiting decision PA26/07415

17 Prospect Place Truro Cornwall TR1 1HW

Proposed replacement of mundic block wall

Full application Cornwall
23 Oct 2026 Awaiting decision PA26/07277

Creek Bank Restronguet Point Feock Truro Cornwall TR3 6RB

Demolition of glazed extension and garage and construction of new rear and front extensions and construction of a replacement garage.

Full application Cornwall
23 Oct 2026 Awaiting decision PA26/07185

Candlecroft HQ Blue Hills St Agnes Cornwall TR5 0RG

Single storey en-suite extension and associated works

Full application Cornwall
23 Oct 2026 Awaiting decision PA26/07039

4 Boscawen Road Falmouth Cornwall TR11 4EL

Addition of a single pedestrian gate on boundary of property

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/07294

2 Coinagehall Place Penzance Cornwall TR18 4AZ

Replacement windows & door

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/06692

Buildings South Of The Forge Cape Cornwall St Just Penzance Cornwall TR19 7NN

Demolition of existing buildings and construction of annexe

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/07263

Palmers Egloskerry Launceston Cornwall PL15 8RX

Removal of Prefabricated Concrete Garage and Erection of New Double Garage

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/07058

Carvinick Farmhouse Gorran St Austell Cornwall PL26 6NY

Proposed Garage and workshop

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/06835

18 Clifton Terrace Hayle Cornwall TR27 4BP

Single-storey rear extension to form a new dining room (approx. 2.592m x 4.1m), with garden regrading, new retaining wall.

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/07243

Greenwith Place Silver Hill Perranwell Station Truro Cornwall TR3 7LR

Proposed conversion and extension of outbuilding to form new dwelling, with associated works including new access and garage with variation of conditi...

Application under Section 73 of TCP Act Cornwall
22 Oct 2026 Awaiting decision PA26/06534

Trenisson Farm House Portloe Truro Cornwall TR2 5PL

Construction of two storey and single storey rear extensions, external alterations and refurbishment works to Trenisson Farm House, together with chan...

Full application Cornwall
22 Oct 2026 Awaiting decision PA26/05063

Tregolls Cottage Tregolls Stithians Truro Cornwall TR3 7BX

Proposed two storey extension to existing dwelling

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/07353

Chybyghan Newmill Penzance Cornwall TR20 8XN

Single storey side extension

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/06234

Pengwins Tresowes Ashton Helston Cornwall TR13 9SY

Erection of self-build dwelling with integral garage and detached workshop/bicycle storage with variation of condition 2 of decision PA26/02527 dated ...

Application under Section 73 of TCP Act Cornwall
21 Oct 2026 Awaiting decision PA26/07211

27 St Peters Way Porthleven Helston Cornwall TR13 9AY

First floor extension above existing garage, new entrance porch canopy and flat roof window to existing rear extension

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/07205

Yolland Farm Upton Cross Liskeard Cornwall PL14 5AJ

Construction of a Three-Bay Oak-Fronted Garage

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/07168

Charlton Lodge Bay View Road East Looe Looe Cornwall PL13 1JP

Alterations to the front of the property (windows and doors), partial removal of the first floor and dormer window and replacement with a balcony, and...

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/07148

30 Billings Drive Newquay Cornwall TR7 2SQ

Replacement of sunroom with construction of a single storey rear extension and alterations.

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/06961

53 Fairfields Probus Truro Cornwall TR2 4FG

Installation of conservatory on the side of the property.

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/06922

84 Mongleath Road Falmouth Cornwall TR11 4PW

Rear ground floor extension, replacement porch & associated works

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/07344

1 Tregellast Close St Keverne Helston Cornwall TR12 6NH

Proposed Extension and Alterations

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/07156

6 Pentire Road Newquay Cornwall TR7 1NX

To construct a replacement single storey extension, an entrance porch with balcony and realignment of boundary

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/06557

2 New Road Port Isaac Cornwall PL29 3SB

Replacement of existing summer house with new outbuilding for incidental use (Home office/gym, garden store and workshop)

Full application Cornwall
21 Oct 2026 Awaiting decision PA26/04344

Land At Treraven Farm Treraven Lane Wadebridge Cornwall PL27 7JZ

Construction of building for use as a studio and annexe and change of use of land to garden.

Full application Cornwall
20 Oct 2026 Awaiting decision PA26/07308

Kenneggy Barn Kenneggy Germoe Penzance Cornwall TR20 9AH

Proposal for a two-storey side extension to replace an existing single-storey side extension.

Full application Cornwall
20 Oct 2026 Awaiting decision PA26/06941

4 Kenwyn Park St Kew Highway Bodmin Cornwall PL30 3EA

Demolition of Rear Conservatory and Construction of Rear Extension and Extension of Front & Rear Dormers

Full application Cornwall
20 Oct 2026 Awaiting decision PA26/07316

17 St Michaels Street Penzance Cornwall TR18 2DG

Replacement single storey rear porch extension and installation of rooflights in main roof.

Full application Cornwall
20 Oct 2026 Awaiting decision PA26/07313

Lynwood Tresamble Hill Ponsanooth Truro Cornwall TR3 7JJ

Proposed erection of a garage.

Full application Cornwall
20 Oct 2026 Awaiting decision PA26/06751

Moville House 78 Fore Street Polruan Fowey PL23 1PH

Replacement of existing mono-pitch garage roof with new profile metal roof

Full application Cornwall
19 Oct 2026 Awaiting decision PA26/07281

12 Burley Close Truro Cornwall TR1 2EP

Application for Certificate of Lawful Development for proposed use namely loft conversion

Cert Lawfulness - proposed dev/use Cornwall
19 Oct 2026 Awaiting decision PA26/07297

47 Tinney Drive Truro Cornwall TR1 1AT

Notification of prior approval for a proposed single storey pitched roof extension

General Permitted Development Extensions Cornwall
19 Oct 2026 Awaiting decision PA26/07114

5 Weeth Lane Camborne Cornwall TR14 7JL

Replacement of asbestos roof tiles with natural slate. Demolition of existing Garage and Workshop and replacement Garage. New Rear Extension. New doub...

Full application Cornwall
19 Oct 2026 Awaiting decision PA26/06910

Gillwood Two Waters Foot Liskeard Cornwall PL14 6HR

Proposed balcony, workshop and replacement carport

Full application Cornwall
19 Oct 2026 Awaiting decision PA26/06826

Goodmerry Park Quethiock Liskeard Cornwall PL14 3SH

Proposed annexe for sleeping and living space extra to the dwelling house

Full application Cornwall
19 Oct 2026 Awaiting decision PA26/05881

Piggery Barn Tinney Hall Lane Lewannick Launceston Cornwall PL15 7QE

Conversion / change of use of a barn to a dwelling, together with the erection of an extension

Full application Cornwall
18 Oct 2026 Awaiting decision PA26/06059

Nancemellan Lambs Hill Crackington Haven Bude Cornwall EX23 0NN

Listed Building consent Installation of a high quality timber sauna for incidental domestic enjoyment ancillary to the main dwellinghouse.

Listed Building Consent Cornwall
18 Oct 2026 Awaiting decision PA26/06058

Nancemellan Lambs Hill Crackington Haven Bude Cornwall EX23 0NN

Installation of a high quality timber sauna for incidental domestic enjoyment ancillary to the main dwellinghouse.

Full application Cornwall
16 Oct 2026 Awaiting decision PA26/07121

Chi Skiber Vras Gusti Veor Newquay Cornwall TR8 4JU

Proposed Garage & Boundary Privacy Wall

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.