The Key Difference Between Planning Permission and Permitted Development
Planning permission and permitted development are not the same thing, and confusion between the two causes costly delays and problems. Permitted Development rights allow certain home improvements without planning permission. Planning permission is required for work outside these rights.
Understanding which category your extension falls into determines your application process and timescale. Many projects qualify for Permitted Development, meaning you can proceed quickly without waiting for council approval. Other projects require planning permission, adding 8-12 weeks to timescales. Omnis Developments clarifies which path your project needs during initial assessment.
What Qualifies for Permitted Development Rights
Permitted Development rights allow single storey extensions, loft conversions, garden buildings, and certain modifications without planning permission, provided they meet strict criteria. For extensions, Permitted Development limits include: maximum 4 metres height, extension must not exceed 3 metres beyond the rear building line, and the extension must not cover more than 50 per cent of the original garden area.
Terraced house extensions rarely qualify for Permitted Development. Conservation areas and listed buildings have different, more restrictive rules. Your property type and location determine eligibility. Omnis Developments checks your property status and advises whether Permitted Development applies to your specific project.
When Planning Permission Is Required
Planning permission is required when your extension falls outside Permitted Development limits or your property type excludes you. Extensions that exceed height or depth limits, cover more than half your garden, or are on conservation areas or listed properties need planning permission.
Planning permission involves council consultation, neighbour notification, and council decision making. Decisions can take 8-12 weeks. Objections from neighbours or planning officers can result in refusal. However, planning permission is not refused lightly for straightforward extensions, particularly if your proposal follows council planning policies and respects neighbour amenity.
Building Regulations: Always Required
Whether you need planning permission or not, Building Regulations approval is always required. Building Regulations govern structural integrity, insulation, electrical safety, plumbing, and fire safety. They ensure extensions are safe and properly constructed.
Building Regulations involve inspection at multiple construction stages. Inspectors check foundations, structural work, insulation, electrical installation, and final completion. Once passed, you receive a Building Regulations completion certificate. This protects your investment and is essential when selling your property. Omnis Developments manages Building Regulations compliance from start to finish.
Timescales: Planning vs Permitted Development
Permitted Development projects typically take 3-5 months from start to completion, assuming no building control complications. You gain approval quickly and proceed to construction without delay. Planning permission projects take longer: 8-12 weeks for planning approval, plus 4-6 months construction equals 5-8 months total project duration.
The timeline difference matters significantly. If your project qualifies for Permitted Development, you enjoy faster completion and lower costs. If planning is required, expect longer timescales but proceed with confidence knowing your proposal has council approval. Omnis Developments advises you of realistic timescales for your specific project.
Cost Implications: Permission vs Permitted Development
Permitted Development projects avoid planning application fees (typically £200-500) but still require Building Regulations approval and fees. Planning permission projects include planning application fees plus increased administration and potentially longer construction timescales due to delayed starts.
The cost difference is modest in absolute terms but perceived value is significant. Faster projects have lower management costs and quicker returns on investment. Omnis Developments provides transparent cost estimates showing all fees and charges upfront, so you understand total project cost.
Frequently Asked Questions
My property is in a conservation area. Can I use Permitted Development?
Conservation areas have stricter rules. Some Permitted Development rights are removed entirely. Omnis Developments assesses your conservation area requirements and advises whether planning permission is needed.
What happens if my Permitted Development extension is refused building control?
Refusal is rare if the extension meets Permitted Development criteria and is properly constructed. If building control raises concerns, Omnis Developments works with inspectors to resolve issues and bring the work into compliance.
If I get planning permission, do I still need building control approval?
Yes. Planning permission and Building Regulations are separate. You need both planning permission and Building Regulations approval. Omnis Developments handles both requirements simultaneously.