House extensions in Conwy

Conwy received 222 householder applications in the last 12 months - about 4 a week. Garage works and rear extensions are the most common. Of the 142 decided so far, 125 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 79 applications
Yesterday REGISTERED 0/53707

The Tal Y Cafn Llanrwst Road Tal Y Cafn LL28 5RR

Proposed internal alteration to lower ground floor of the previously approved 3 no bedroom self catering lodge in order to provide two additional bedr...

Full Conwy
2 days ago REGISTERED 0/53704

28 Penlan Deganwy Conwy LL30 1PE

Single Storey balcony extension to front of existing dwelling. Revised proposal following refusal of application 0/53553.

Full Conwy
24 Sept 2026 REGISTERED 0/53702

12 Rhodfa Lwyd Llysfaen LL29 8BH

Proposed rear and side extension and associated development including new patio area

Full Conwy
24 Sept 2026 REGISTERED 0/53695

10 Glyn Circle Kinmel Bay LL18 5HE

Addition of a side extension (ground floor and first floor), rear extension to side of existing rear extension and front elevation of existing roof to...

Full Conwy
24 Sept 2026 REGISTERED 0/53701

51 Pen y Bryn Road Colwyn Bay Conwy LL29 6AG

Construction of single storey extension to rear of existing dwelling in lieu of existing conservatory structure.

Full Conwy
21 Sept 2026 REGISTERED 0/53685

111 Mostyn Street Llandudno LL30 2PD

Replacement Canopy

Full Conwy
21 Sept 2026 REGISTERED 0/53686

111 Mostyn Street Llandudno LL30 2PD

Replacement Canopy (Listed Building Consent)

Listed Building Consent Conwy
10 Sept 2026 REGISTERED 0/53673

Ysgubor Ffordd Cennin Cottage Llanbedr Y Cennin Conwy LL32 8JA

Proposed change of use of land for the erection of menege and additional curtilage for parking and turning together with erection of outbuilding / sta...

Full Conwy
10 Sept 2026 REGISTERED 0/53674

Caer Rhun Hall Llanrwst Road Tal Y Bont Conwy LL32 8HX

The erection of a fully removable and reversible marquee in the gardens at Caer Rhun Hall

Full Conwy
10 Sept 2026 REGISTERED 0/53675

Pen Y Gader Caerhun To Llanrwst Road Tyn Y Groes Conwy LL32 8SX

Retrospective application for the Proposed Extension to outbuilding, landscaping, natural pond and increased hard standing area

Full Conwy
9 Sept 2026 REGISTERED 0/53669

5 West Beach West Parade Llandudno LL30 2AX

Proposed balcony and replacement doors on second floor, front elevation of dwelling

Full Conwy
8 Sept 2026 REGISTERED 0/53659

Glan Elwy Cottage Turnpike Ucha To Nant Mawr Llangernyw LL22 8TY

Proposed detached garage and formation of manage

Full Conwy
8 Sept 2026 REGISTERED 0/53660

61-63 Mostyn Street Llandudno LL30 2NW

External changes to front, East & Somerset Street elevations to accommodate proposed facade alterations

Full Conwy
8 Sept 2026 REGISTERED 0/53665

11 Craig View Rhos On Sea LL28 4SR

First Floor Dormer Extension

Full Conwy
7 Sept 2026 REGISTERED 0/53657

217 Station Road Deganwy LL31 9EX

Proposed creation of off street parking area together with associated works, proposed alterations to front elevation of property together with associa...

Full Conwy
7 Sept 2026 REGISTERED 0/53658

5 Lon Vardre Deganwy LL31 9HX

Demolition of a single storey rear extension to build a two storey rear extension and some alteration to the front elevation fenestration along with t...

Full Conwy
3 Sept 2026 REGISTERED 0/53651

Bryn Awelon Sychnant Pass Road Conwy LL32 8RE

Side and rear single-story extensions, alteration to front porch, internal remodelling and garage conversion. To include a new open plan kitchen/ livi...

Full Conwy
3 Sept 2026 REGISTERED 0/53656

Plas Isaf Plas Isaf Drive Abergele LL22 8DG

Proposed rear and side extensions together with internal alterations

Full Conwy
3 Sept 2026 REGISTERED 0/53649

150 Llanrwst Road Upper Colwyn Bay Colwyn Bay Conwy LL28 5YL

Alterations and extension to rear of existing dwelling

Full Conwy
2 Sept 2026 REGISTERED 0/53647

Dyffryn Ffordd Llwyn Ddu Eglwysbach LL28 5UH

Certificate of lawfulness for the proposed change of use of existing vacant agricultural outbuildings into holiday accommodation (2no units) including...

Certificate of Lawful Development (Prop) Conwy
2 Sept 2026 REGISTERED 0/53644

Bwthyn Carmel Tai Candryll Road Carmel Llanrwst LL26 0PE

Proposed extension to residential curtilage, new access, garage and associated works

Full Conwy
2 Sept 2026 REGISTERED 0/53645

Rhandir Mwyn Llanfair Road Abergele Conwy LL22 8DL

Side extension of existing detached garage

Full Conwy
1 Sept 2026 REGISTERED 0/53643

Eaton Fives Court 8 Rydal Penrhos School Pwllycrochan Avenue Colwyn Bay LL29 7DA

First floor extension at the Eton Fives Court building, Rydal Penrhos School. The proposal involves the replacement of an existing first floor conserv...

Full Conwy
1 Sept 2026 REGISTERED 0/53639

5 Rhiw Road Colwyn Bay LL29 7TE

Certificate of Lawfulness for the proposed replacement of existing vertical boiler flue to the principal elevation roof

Certificate of Lawful Development (Prop) Conwy
27 Aug 2026 REGISTERED 0/53088

Anrose House 27 Llandudno Road Penrhyn Bay LL30 3EP

1) Retrospective planning application for replacement and extension of existing wooden fence from left side wall of house up to the boundary wall and ...

Full Conwy
27 Aug 2026 REGISTERED 0/53629

Eithiniog Lodge Old Highway Colwyn Bay LL28 5YA

Certificate of Lawfulness for a proposed single storey rear and single storey side extension.

Certificate of Lawful Development (Prop) Conwy
27 Aug 2026 REGISTERED 0/53631

Hyfrydle St Beuno's Road Great Orme Llandudno LL30 2JU

Certificate of Lawfulness for the proposed change of fenestration to the rear elevation of the existing dwellinghouse.

Certificate of Lawful Development (Prop) Conwy
26 Aug 2026 REGISTERED 0/53624

39 Allanson Road Rhos On Sea LL28 4HL

Demolition of existing garage and outbuildings, erection of single storey annexe for homeowner use, and introduction of window at first floor level to...

Full Conwy
26 Aug 2026 REGISTERED 0/53625

147 Llanrwst Road Upper Colwyn Bay Colwyn Bay LL28 5YS

Rear extension that includes a 2 storey section with a smaller single storey to provide a larger kitchen/dining/utility and a wet room to enhance the ...

Full Conwy
26 Aug 2026 REGISTERED 0/53627

76 Penrhyn Beach East Penrhyn Bay LL30 3RW

Proposed Internal and External Alterations. Alterations to the garage roof, new side window opening, alteration to front bay window and new front door...

Full Conwy
26 Aug 2026 REGISTERED 0/53620

9 Sunningdale Avenue Upper Colwyn Bay Colwyn Bay LL29 6DF

Proposed First Floor Extension

Full Conwy
25 Aug 2026 REGISTERED 0/53618

9 Pen Y Gaer Deganwy LL31 9RF

Certificate of Lawfulness for the proposed demolition of existing rear conservatory & entrance porch, erection of a single storey rear extension & rep...

Certificate of Lawful Development (Prop) Conwy
25 Aug 2026 REGISTERED 0/53619

West Winds 72 Deganwy Road Deganwy LL31 9DN

Proposed extensions and alterations to dwelling including rear extension, roof alterations and dormers, balcony, replacement windows and doors, extern...

Full Conwy
25 Aug 2026 REGISTERED 0/53617

79A Rhos Promenade Rhos On Sea Conwy LL28 4PR

Formation of first floor balcony off existing first/second floor flat above commercial premises

Full Conwy
25 Aug 2026 REGISTERED 0/53616

Strathmore St George Road Abergele LL22 9AR

Proposed erection of detached building to form home office demolish of existing carport

Full Conwy
20 Aug 2026 REGISTERED 0/53610

Dilysdale Gannock Road Deganwy LL31 9HJ

Certificate of Lawfulness for a proposed extension to dwelling.

Certificate of Lawful Development (Prop) Conwy
20 Aug 2026 REGISTERED 0/53608

Ty Celyn Bryn Celyn Conwy LL32 8PW

Alterations to existing drive, and dropped kerb, including new planting

Full Conwy
19 Aug 2026 REGISTERED 0/53603

4 St Andrews Road Colwyn Heights Colwyn Bay Conwy LL29 6DL

Alterations and extension to existing dwelling.

Full Conwy
19 Aug 2026 REGISTERED 0/53607

Bryn Y Neuadd Hospital, Ty Llewelyn Secure Unit Aber Road Llanfairfechan LL33 0HH

Small extension to existing medium-secure mental health unit, to provide a safe care suite with associated plant room above and external landscaping a...

Full Conwy
19 Aug 2026 REGISTERED 0/53606

Bryn Dowsi Farm Cottages Henryd Road Conwy LL32 8YF

Extension to agricultural building

Full Conwy
19 Aug 2026 REGISTERED 0/53601

8 Llwynon Gardens Llandudno LL30 2HP

Removal of front boundary wall to facilitate a vehicular parking space

Full Conwy
19 Aug 2026 REGISTERED 0/53604

Pennant Hall Ffordd Pennant Eglwysbach LL28 5UN

The proposal is to alter in minor respects the main staircase design in order (i) principally to facilitate increasing the door head height from the e...

Listed Building Consent Conwy
18 Aug 2026 REGISTERED 0/53600

Bryn Euryn Cottage 78 & 80 Tan Y Bryn Road Rhos On Sea LL28 4TU

Proposed conversion of 2 no dwellings into 1no dwelling

Full Conwy
17 Aug 2026 REGISTERED 0/53595

Church House Ffordd Bwlch Y Ddwyfan Llanbedr Y Cennin Conwy LL32 8JB

Single storey side extension. Erection of replacement balcony. Reposition of garden wall. Internal alterations. Window and door alterations and replac...

Full Conwy
17 Aug 2026 REGISTERED 0/53596

Church House Ffordd Bwlch Y Ddwyfan Llanbedr Y Cennin Conwy LL32 8JB

Single storey side extension. Erection of replacement balcony. Reposition of garden wall. Internal alterations. Window and door alterations and replac...

Listed Building Consent Conwy
17 Aug 2026 REGISTERED 0/53590

Gwyndy Melin Y Coed To Carmel Melin Y Coed Llanrwst LL26 0SL

1) Replacement of the kitchen flat roof with a slate covered pitched roof and; 2) Replacement of the bathroom flat roof with a slate pitched roof.

Full Conwy
17 Aug 2026 REGISTERED 0/53594

Hillside Bodafon Road Craigside Llandudno LL30 3BA

Proposed terrace extension along with undercroft parking

Full Conwy
13 Aug 2026 REGISTERED 0/53582

Bryn Euryn Esplanade Penmaenmawr Conwy

Retrospective application for the addition of a front entrance porch to existing dwelling

Full Conwy
12 Aug 2026 REGISTERED 0/53580

Byways Gannock Park West Deganwy LL31 9HQ

Proposed side two storey extension and roof mounted solar panels, extended driveway, new boundary wall and extended rear terrace

Full Conwy
12 Aug 2026 REGISTERED 0/53581

Conwy Morfa Day Nursery Penmaen Road Conwy LL32 8HB

Removal of existing portacabin and erection of a detached composite building as ancillary use to existing nursery

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

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