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 guideThe permitted development size limits for conservatories are 4m rear projection for detached houses and 3m for others. Here’s every rule explained with practical examples.
Under standard permitted development rules: 4m maximum rear projection for a detached house; 3m for a semi-detached or terraced house. Maximum height 4m. Maximum eaves height 3m if within 2m of a boundary.
The size limits for a conservatory are the same as those for a single-storey rear extension, as set out in Part 1 Class A of the GPDO 2015. These limits determine whether planning permission is required.
The rear projection is the key measurement — it is the distance from the original rear wall of the house to the furthest point of the conservatory.
| House type | Maximum projection (standard PD) | Maximum projection (Neighbour Consultation Scheme) |
|---|---|---|
| Detached house | 4m | 8m |
| Semi-detached or terraced house | 3m | 6m |
Important: the measurement is from the original rear wall — the wall as first built (or as it stood on 1 July 1948). If you have already extended the house at the rear, any existing extension counts towards the limit.
The maximum height for a conservatory under permitted development is:
For a typical lean-to conservatory (single-pitch roof), the eaves height at the back (away from the house) is the relevant measurement if the conservatory is within 2m of a side or rear boundary.
Two further limits apply regardless of rear projection:
For larger conservatories (up to 8m for detached houses and 6m for semi-detached/terraced), the Neighbour Consultation Scheme (sometimes called the “prior approval” process for larger home extensions) allows you to go beyond the standard PD limits provided:
The council can refuse if there are material objections, but the bar is set at impact on adjoining properties — not general planning grounds. The application costs £249 (from 1 April 2026).
| Scenario | Planning position |
|---|---|
| Detached house, 3.5m rear conservatory, no previous extension | ✅ Permitted development (within 4m limit) |
| Semi-detached, 3m rear conservatory, no previous extension | ✅ Permitted development (exactly 3m) |
| Semi-detached, 3.5m rear conservatory, no previous extension | ❌ Exceeds 3m — needs Neighbour Consultation Scheme or planning permission |
| Terraced, 2m previous extension + 1m conservatory = 3m total | ✅ Permitted development (3m total from original wall) |
| Detached, 5m rear conservatory, no previous extension | ❌ Exceeds 4m standard PD — requires Neighbour Consultation Scheme (within 8m) or full planning |
| Semi-detached, conservatory on side of house | ❌ Side extension — needs planning permission (side PD rules are stricter) |
Our Conservatory 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 Conservatory package →
Check my property and start my project · Read the conservatory rules
Need the drawings? See our conservatory drawing set — 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.
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£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
