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.
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A dormer window can add head height, natural light and usable space to your loft conversion — and in many cases it can be built under Permitted Development (PD) without a full planning application.
See what you could build at your home and choose the right drawing package.
Dormer windows fall under Class B of the Permitted Development Order. The main limits are set by the size, height and design of the dormer, with additional rules for the position on the roof and materials, particularly for side-facing dormers.
Your dormer must comply with all of the relevant PD rules. If any single limit is exceeded, a normal planning application may be required.
Different types of dormer window may be permitted under PD, including:
Rear dormerThe most common type, increasing head height and usable floor space in your loft.
Gable-front dormerCan be permitted in some cases, subject to size and design limits.
Flat-roof dormerA popular option, often permitted to the rear of the property.A dormer is limited by the volume it adds to the original roof space: 40 cubic metres for a terrace house, or 50 cubic metres in any other case, including any previous enlargement.
No part may exceed the height of the highest part of the existing roof, and nothing may extend beyond the plane of a roof slope that forms the principal elevation and fronts a highway. The enlargement should be set back at least 0.2 metres from the original eaves, measured along the roof slope, so far as practicable.
The materials used should be of a similar appearance to the existing roof, including the roof covering and any cladding.
A rear dormer creating a larger bedroom and en-suite — built within PD limits.
A complete, builder-ready set of drawings supplied exactly as sold.
We will check your property, apply the relevant Permitted Development rules and help you configure the right design and drawing package for your home.
Permitted Development rights described on this page apply to houses in England under the Town and Country Planning (General Permitted Development) (England) Order 2015. Different planning rules apply in Scotland, Wales and Northern Ireland. This page is general guidance, not a formal planning determination — always check your own property and, where you need certainty, apply to your local planning authority for a Lawful Development Certificate.
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.
£900Turns 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.
£900We 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
