Single Storey Extension Roof Options – What’s Best for Your Home?

Looking at single storey extension roof options is an exciting opportunity to transform your home – whether you’re adding a new kitchen, family room, or home office. One of the key design decisions you’ll need to make early on is the type of roof your extension will have.

At MJB Technical Services Ltd, we work with homeowners across the UK to design extensions that are not only functional but also complement the character of the existing property. Choosing the right roof can affect everything from the aesthetics and planning permission to insulation and long-term maintenance.

Here’s our guide to the most common single storey extension roof options – including the pros and cons of each.

1 – Flat Roof

Flat roofs are a popular choice for modern or minimalist extensions. Despite the name, they have a slight pitch to allow for water runoff.

Pros:

Sleek, contemporary look
Lower construction cost
Easier to build in tight spaces or against existing structures
Ideal for adding roof lanterns or skylights

Cons:

Shorter lifespan compared to pitched roofs
More maintenance needed (especially drainage)
Can be less visually appealing on traditional homes

Our view:

Flat roofs are great for modern-style rear extensions or where height is restricted. We can help design high-performance warm roof systems and integrate rooflights to maximise natural light.

2 – Pitched Roof (Gable or Dual-Pitched)

A pitched roof is one of the most traditional and durable options, featuring two sloping sides that meet in the middle. It’s often used to blend a new extension seamlessly with the main house.

Pros:

Excellent water drainage and weather performance
Traditional, attractive appearance
Greater internal ceiling height
Longer lifespan and durability

Cons:

Higher build cost than a flat roof
Can affect first-floor windows or restrict views
May require planning permission if ridge height exceeds limits

Our view:

A pitched roof is ideal if you want your extension to look like it’s always been part of the house. We’ll make sure it complements your existing roofline and meets local planning requirements.

3 – Lean-To Roof (Mono-Pitch Roof)

A lean-to roof is a single slope that leans away from the existing property. It’s a simple, cost-effective solution that suits many types of homes.

Pros:

Straightforward and affordable to build
Works well for small or narrow extensions
Can often be built under Permitted Development

Cons:

Limited head height at the far end
May look too basic on larger extensions
Less suited to complex roof junctions

Our view:

A mono-pitched roof works particularly well on side return or utility extensions. We can design it with roof windows to bring in natural light and avoid a dark interior.

4 – Parapet Roof

Parapet roofs hide the slope of the roof behind a raised wall, creating a clean, boxy look from the outside. This is popular in contemporary urban settings.

Pros:

Very modern, minimalist appearance
Roof structure is hidden
Works well with bi-fold doors and full-width glazing

Cons:

More complex detailing required for waterproofing
Slightly higher construction cost
Not always in keeping with period properties

Our view:

We often recommend parapet roofs for contemporary rear extensions where the client wants a crisp, architectural look. Our team ensures all drainage and insulation details are handled correctly to avoid future issues.

5 – Green Roof or Living Roof

An eco-friendly option, green roofs feature a waterproof membrane covered with soil and vegetation. They offer excellent thermal performance and can help reduce rainwater runoff.

Pros:

Eco-friendly and great for biodiversity
Adds insulation and absorbs rainwater
Visually appealing from upper floors

Cons:

Higher initial cost
Requires structural support and ongoing maintenance
Not suitable for all roof types or orientations

Our view:

We can help you explore whether a green roof is feasible for your extension – from structural assessment to specialist detailing.

Single Storey Extension Roof Options – What Else Should You Consider?

When choosing a roof for your single-storey extension, don’t forget to think about:

Planning permission – Some roof types may affect whether your project qualifies under Permitted Development.
Neighbouring properties – Overshadowing or overlooking can be affected by roof height and pitch.
Skylights and roof lanterns – Great for maximising light but may impact privacy or require planning in some cases.
Matching materials – Your new roof should blend well with the existing property, or contrast intentionally if going for a modern look.

How We Can Help?

At MJB Technical Services Ltd, we offer expert advice on all aspects of extension design, including the best roof type for your home and budget. Our services include:

Full architectural design and planning drawings
Advice on roof structure and material choices
Planning permission applications
Building regulation drawings
Rooflight, roof lantern, and drainage detailing

Thinking About Single Storey Extension Roof Options?

01246 267 559
info@mjbtech.co.uk
https://mjbtech.co.uk