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.
Explore all guides
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guide
Rules, design options, costs and next steps.
View guideA side extension can dramatically increase your living space — adding a kitchen, utility room, playroom, or extra bedroom to the side of your home. Under permitted development rights, many homeowners can build a single storey side extension without planning permission, but the rules are specific and worth understanding before you start.
Yes, in many cases. Single storey side extensions are covered by Class A of Schedule 2, Part 1 of the Town and Country Planning (General Permitted Development) (England) Order 2015 — the same legislation that covers rear extensions. Provided your extension meets all the conditions, no planning application is needed.
Note: Double storey side extensions always require planning permission — there is no permitted development route for a two-storey side extension.
To qualify as permitted development, a single storey side extension must meet all of the following conditions:
The maximum width is half the width of the original house. This is measured from the original house as built — not including any existing extensions.
For example:
If your home is in a conservation area, National Park, Area of Outstanding Natural Beauty, or World Heritage Site, you cannot build a side extension under permitted development. Any side extension in these areas will require a full planning application.
This is one of the most important distinctions — conservation area restrictions on side extensions are stricter than for rear extensions.
While not compulsory, a Lawful Development Certificate (LDC) is strongly recommended. It provides formal written confirmation from your local planning authority that the extension was lawful under PD rules — which is particularly useful when you come to sell the property, as solicitors and mortgage lenders will often request proof.
Even without planning permission, you’ll need full architectural drawings for building regulations approval and for your builder to quote and work from accurately. Our side extension drawing packages include everything required — floor plans, elevations, and structural details — available as instant downloads.
No. Double storey side extensions are not permitted development and always require a full planning application.
Yes. Materials used in the extension should be similar in appearance to those used in the existing house. This is a condition of permitted development.
Yes, but a wrap-around (L-shaped) extension is treated as both a rear and a side extension, so the whole extension must meet both sets of limits — including the half-width rule. Side extensions are not permitted development in conservation areas or other designated land.
Yes. Side extensions are not permitted development in conservation areas, National Parks, or Areas of Outstanding Natural Beauty. You will need to submit a full planning application.
Need the drawings? See our single storey side extension drawing set — supplied exactly as sold and emailed to you as a PDF.
Our Single Storey Side 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 Side Extension package →
Check my property and start my project · Read the side extension rules
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.
View guideWe use cookies that are needed to run the basket and checkout. We would also like to use analytics cookies to understand how the site is used. We only do that if you say yes.
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
