What type of planning application is most likely to be approved in Gwynedd?

Conservatory at 95.9% based on 197 decisions.

What is hardest to get planning permission for in Gwynedd?

HMO at 64.9% based on 37 decisions.

How do approval rates vary by project type in Gwynedd?

From 95.9% (Conservatory) to 64.9% (HMO). What you build matters as much as where you build it.

Most Common Planning Applications in Gwynedd

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Gwynedd is 31.0% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

11,039 real decisions·16 project types·Updated August 2026

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All 16 project types ranked

#	Type	Decisions	Approved	Refused	Rate
1	Conservatory	197	189	8	95.9%
2	Rear Extension	649	608	41	93.7%
3	Side Extension	441	409	32	92.7%
4	Basement	27	25	2	92.6%
5	Loft Conversion	117	107	10	91.5%
6	Extension (General)	1,836	1,679	157	91.4%
7	Wraparound Extension	45	40	5	88.9%
8	Front Extension	95	84	11	88.4%
9	Outbuilding	708	613	95	86.6%
10	Garage / Parking	996	855	141	85.8%
11	Change of Use (Residential)	664	561	103	84.5%
12	Dormer	288	243	45	84.4%
13	New Build	521	412	109	79.1%
14	Annex	165	130	35	78.8%
15	Flat Conversion	33	23	10	69.7%
16	HMO	37	24	13	64.9%

See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 95.9% approval rate. HMO? Just 64.9%.
Check your postcode to see what actually happens near your address.

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What the data tells us

The range is massive: 64.9% to 95.9%. Choosing the right project type — or framing your application correctly — can dramatically affect outcomes.

Visibility drives scrutiny. Project types that change the external appearance — dormers, loft conversions, hip-to-gable — face more resistance than those that don't. The more visible your proposal, the more carefully it needs designing.

These are council-wide averages. Your ward, your street and your immediate neighbours all shift the odds. The comparable decisions near your property are the best indicator of outcome.

Before you spend £5,000+ on architects and drawings

1,259 planning applications in Gwynedd have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A free, property-specific report shows you what gets approved — and what gets refused — near your property.

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More Gwynedd planning data

Methodology: Classifies 11,039 decisions in Gwynedd into residential project types using keyword matching against proposal descriptions (matching generate_site_data.py subtype rules). A single application may appear in multiple categories. Data from Gwynedd Council's public planning portal, January 2020 to August 2026. Full methodology →