Dormer Loft Conversion Plans from £995 | Draw Plans London & Home Counties

Dormer Loft Conversion Plans

Tailored Designs from £995 + VAT by Architectural Experts

A dormer loft conversion is one of the most popular and versatile ways to add space, light, and value to your home. Whether you're looking to add an extra bedroom, home office, or en-suite, a dormer extension provides the space and headroom you need to turn your loft into a fully functional room.

At Draw Plans, we specialise in producing professional, fixed-price dormer loft conversion plans starting from just £995 + VAT. Serving London and the Home Counties, we’ll help you create a well-designed space that’s compliant with Building Regulations and ready for planning approval where required.

What Is a Dormer Loft Conversion?

A dormer conversion extends vertically from the slope of your existing roof, creating a flat-ceilinged section that increases the internal floor space and head height of your loft. It’s an ideal option for homes with limited usable loft space due to the pitch of the roof.

There are several types of dormers, including:

Flat roof dormers (most common and cost-effective)
Pitched roof dormers
L-shaped dormers
Hip-to-gable dormers (often used in semi-detached homes)

Benefits of a Dormer Loft Conversion

Why Choose a Dormer Loft Conversion?

Significantly increased head height and usable floor space
Ideal for bedrooms, en-suites, home offices, or studios
Floods your loft with natural light
Increases the value of your property by up to 20%
Often qualifies under permitted development (subject to limits)

A dormer conversion can make a previously cramped loft feel like a full-height room — adding practical and valuable space without extending your home’s footprint.

Dormer Loft Conversion Cost Guide

The cost of a dormer loft conversion depends on the size of the extension, the number of rooms you’re adding, and the internal specification.

Here's a typical price breakdown:

Dormer Conversion TypeEstimated Cost (Excl. VAT)
Basic dormer (no en-suite)£30,000 – £40,000
Dormer with en-suite bathroom£35,000 – £50,000
L-shaped dormer (for large spaces)£45,000 – £60,000+
Draw Plans architectural design feeFrom £995 + VAT

At Draw Plans, we offer affordable dormer loft conversion plans that cover everything your builder and Building Control need — with no hidden fees.

What’s Included in Our Dormer Loft Conversion Plans?

Our comprehensive design service includes:

Measured survey of your property
Existing and proposed floor plans, elevations & sections
Detailed dormer layouts for bedrooms, en-suites, and more
Velux and dormer window positioning
Building Regulations-compliant drawings (Part B, K, L, etc.)
Advice on planning permission or permitted development
PDF + CAD files ready for builders and building control

We tailor every set of dormer loft conversion plans to your space, needs, and budget.

Dormer Loft Conversion Ideas

There’s almost no limit to how you can use the space created by a dormer loft conversion. With the right design, you can create an entirely new floor of your home.

Popular Dormer Loft Conversion Ideas:

Master bedroom with en-suite and built-in storage
Home office or creative studio with great natural light
Teenager’s bedroom or guest suite
Yoga or fitness space with integrated storage
Open-plan loft living area

Pro Design Tips:

Install larger windows or Juliet balconies for a sense of openness
Use built-in wardrobes and eaves storage to maximise space
Group bathrooms and plumbing near existing services for efficiency
Use open tread stairs or space-saving layouts for tight access points
Let in more light with additional Velux windows if roof shape allows

Planning Permission for Dormer Conversions

Most dormer loft conversions fall under permitted development if they meet these key conditions:

The dormer does not extend beyond the plane of the existing roof at the front
Materials are similar to the existing house
Total loft extension (including any previous work) is under 40m² for terraced or 50m² for detached/semi-detached homes
The dormer does not exceed the height of the existing roof

If your home is in a conservation area, is listed, or if you want a front dormer, you will likely need planning permission — and we’ll help you handle the application.

Areas We Cover

We provide dormer loft conversion plans across:

Greater London
Kent
Surrey
Essex
Hertfordshire
Buckinghamshire
Berkshire

Client Testimonials

“Our dormer loft conversion completely transformed our home. We added a stunning bedroom with en-suite and the space feels huge. Draw Plans made the process simple.”
— Tom & Yasmin R., Croydon

“Highly recommend Draw Plans. Their dormer plans were very detailed and well presented. Our builder said it was one of the easiest jobs to follow.”
— Anita G., Watford

“Great value for money and very helpful throughout. We got planning approval for our dormer first time and have already recommended them to friends.”
— Jack P., Enfield

Why Choose Draw Plans?

Fixed-price dormer loft conversion plans from £995 + VAT
Friendly, experienced architectural designers
Fast turnaround — perfect for getting quotes from builders
Clear drawings tailored to your loft and layout goals
Excellent knowledge of building regulations and planning policy
Trusted by homeowners across London and the Home Counties

Ready to Start Your Dormer Loft Conversion?

Unlock the full potential of your home with a beautifully designed dormer loft conversion.

With prices starting from £995 + VAT, Draw Plans provides everything you need to turn your loft into a bright, spacious, and practical living area.

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