Professional, builder-ready drawing packages for extensions, lofts, porches, garages, garden rooms and more — designed to Permitted Development parameters and supplied as sold.
PERMITTED HOMEOWNER GUIDES
Our illustrated, practical guides help you understand the rules, explore design options and budget with confidence — before you commit to building work.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
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Rules, design options, costs and next steps.
View guideMost kitchen extensions are permitted development if they meet the Part 1, Class A size limits. Here’s what the rules allow, the roof and glazing options, and typical costs.
A kitchen extension at the rear of a house can be permitted development under Part 1, Class A of the GPDO 2015. For detached houses, the standard PD allowance is 4m depth; for semi-detached and terraced houses, 3m. These can be extended to 8m/6m under the Larger Home Extension Scheme. The extension must be single storey, no higher than 4m, and not extend beyond the side elevation of the original house.
| Condition | Detail |
|---|---|
| Maximum depth (detached) | 4m (up to 8m under Larger Home Extension Scheme) |
| Maximum depth (semi/terrace) | 3m (up to 6m under Larger Home Extension Scheme) |
| Maximum height | 4m (3m if within 2m of boundary) |
| Width | Must not extend beyond the side elevation of the original house |
| Storey count | Single storey only |
| Materials | Must match the appearance of the exterior of the existing dwelling |
Bifold and sliding patio doors do not affect permitted development rights. The PD rules relate to the volume and position of the new structure, not the glazing details. You can install bifold doors, corner glass, or Crittall-style steel frames without affecting your PD rights.
| Item | Approximate Cost |
|---|---|
| Small kitchen extension (up to 12m²) | £15,000–25,000 (structure only) |
| Medium kitchen extension (12–25m²) | £25,000–45,000 |
| Large kitchen extension (25–40m²) | £40,000–70,000+ |
| Roof lantern | £2,000–6,000 |
| Bifold doors (3-panel) | £3,000–6,000 |
| New kitchen fit-out | £10,000–30,000+ additional |
Our Single Storey Rear Extension drawing package is pre-designed to the permitted development limits and supplied exactly as sold — £900 fixed price, emailed to you as a PDF.
See the Single Storey Rear Extension package →
Check my property and start my project · Read the rear extension rules
Planning a project? Browse our permitted development drawing sets — fixed price, supplied exactly as sold and emailed to you as a PDF.
Each one is already drawn. You choose the material, roof and options we actually draw, and that is the package you receive.
A practical entrance area that adds space and improves the look of your home.
£350
A popular way to create a larger kitchen, dining or family area.
£900
Adds valuable space to the side of your home for a kitchen or utility.
£900
Turns unused loft space into a bedroom, office or additional living area.
£1,500
A flexible, detached space for work, leisure or extra living space.
£350
Secure parking or useful storage, single or double.
£350
Significantly more living space across both floors.
£1,400
A bright, glazed room connecting your home to the garden.
£900PERMITTED HOMEOWNER GUIDES
Our illustrated, practical guides help you understand the rules, explore design options and budget with confidence — before you commit to building work.
Explore all guidesRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
View guideRules, design options, costs and next steps.
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Maximize your property’s footprint with precision and ease. Permitted provides complete design for Permitted Development Rights. Our packages are designed around the Permitted Development limits, so many projects can proceed without a full planning application.
PERMITTED is operated by Yorkshire Property Design Services Limited, registered in England and Wales under company number 12698267.
Registered office: Ground Floor, Techno Centre, Station Road, Horsforth, Leeds, LS18 5BJ
Business contact address: Wira House, Ground Floor, Suite 5, Ring Road, West Park, Leeds, LS16 6EB
