Granny Annexes

We build contemporary self-contained garden annexe buildings in the South East of England, perfect for keeping your loved ones close, whilst also adding value to your home.

We provide a practical, turnkey granny annexe solution, covering South East England. We strongly believe our annexes are the best on the market, in terms of appearance, comfort, and build quality.

Our beautifully designed annexes feature a bedroom (or two), bathroom, kitchen, and living area, all within a beautiful and separate, self-contained building within your garden.

All our annexe buildings are low-maintenance and building control certified for safety and quality.

We take care of everything from design and planning permission, to plumbing and utility connections. Everything from start to finish, ready for you or your loved ones to move in.

one bedroom granny annexe in Kent

We Were Featured in The Telegraph!

We are proud to share that a recent granny annexe build of ours was featured in The Telegraph newspaper. Read by full article here: https://www.telegraph.co.uk/money/property/elderly-dad-lives-garden-loves-it/

Create A Home in Your Garden

With the high costs of care homes and property prices in the UK, building a granny annexe can be a cost-friendly option for multigenerational living.

Quality care homes often cost upwards of £1,000 – £2,000 per week, while the average house price is just shy of £500,000 in the South East.

Building an annexe for aging parents or teenage/adult children to live in can be much more affordable than these alternatives.

A well-designed annexe allows your loved ones to have their own living space with independence, while staying close to family support.

Constructing an annexe to meet the needs of elderly relatives or grown children trying to find housing can provide security and togetherness for your whole family at a fraction of the cost of other options.

Frequently Asked Questions

Do I need planning permission for a granny annexe?

We apply for both full planning permission AND a Lawful Development Certificate simultaneously to guarantee approval via the fastest route. This dual approach gives you complete flexibility for how your annexe can be used and ensures success regardless of local authority interpretation. We guarantee approval or your money back.

What models do you offer?

We offer five standard models: Studio Annexe (from £85,000), One-Bedroom (from £100,000), and Two-Bedroom (from £120,000).

Can I customise the design?

Yes! While we use standard floor plans for efficiency, you can customise the final size, internal layouts, window positions, cladding materials, kitchen and bathroom specifications, and accessibility features. Our team will work with you to create your perfect annexe.

What's included in your pricing?

Everything: design, dual planning applications, excavation, concrete foundations, all utility connections (20m electrical, 10m water/waste), manufacturing, delivery, installation, complete kitchen and bathroom, heating system, full decoration, and 10-year warranty. No hidden costs.

Do you provide drawings for design and planning purposes?

Yes, we do. Our in-house architect produces our drawings. We also work closely with a planning consultant who submits all our planning applications on our/your behalf.

Build Process & Timeline How long does the whole process take?

From initial consultation to move-in typically takes 6-7 months total: 8-12 weeks for planning approval, 8-12 weeks for manufacturing, and 4-5 weeks on-site with just 5-10 days for actual installation.

Where do you work?

We offer our granny annexe services in South East England: Kent, Surrey, Essex, Greater London, Sussex, Hampshire, and Berkshire. This allows us to provide superior local service, faster response times, and deep planning expertise.

We only take on a limited number of jobs per year, as they require a lot of focus by our company and we want to provide the best service possible.

Add Value with a Garden Annexe Building

A granny annexe adds extra living space to your home without the hassle of undergoing major construction works.

You’ll have peace of mind knowing we handle every detail from compliant design to quality construction.

A garden annexe buildings gives you extra living space that keeps your family happy and connected for years to come.

Built to Last

Built to last decades and designed for practical day-to-day living, our annexes also add beauty to your garden with their contemporary and modern design.

We construct our annexe buildings from premium materials, using 150mm insulation (much greater than what our competitors use) so you can enjoy a space that is comfortable, safe and adds value to your home.

You’ll have peace of mind knowing we handle every detail from compliant design to quality construction.

Planning Permission for Granny Annexes

When building a granny annexe in your garden in the UK, you will likely need planning permission from your local council.

We work closely with a planning consultant who takes care of all our applications, and can help secure approval for your proposed annexe building.

Building Regulations for Granny Annexes

Your annexe will need to comply with UK building regulations for vital elements like fire safety, ventilation, drainage, and more.

We construct all our buildings to meet these standards, and have perfected our build process over a number of years.

Annexe Price Guide (zero VAT) (external dimensions)

     Width

Depth

6.0m

6.5m

7.0m

7.5m

8.0m

8.5m

9.0m

9.5m

10.0m

10.5m

11.0m

11.5m

12.0m

4.0m

£84,000

£86,125

£88,250

£90,375

£92,500

£94,625

£96,750

£98,875

£101,000

£103,125

£105,250

£107,375

£109,500

4.5m

£87,188

£89,531

£91,875

£94,219

£96,563

£98,906

£101,250

£103,594

£105,938

£108,281

£110,625

£112,969

£115,313

5.0m

£90,750

£93,469

£96,188

£98,906

£101,625

£104,344

£107,063

£109,781

£112,500

£115,219

£117,938

£120,656

£123,375

5.5m

£94,313

£97,344

£100,375

£103,406

£106,438

£109,469

£112,500

£115,531

£118,563

£121,594

£124,625

£127,656

£130,688

6.0m

£97,875

£101,219

£104,563

£107,906

£111,250

£114,594

£117,938

£121,281

£124,625

£127,969

£131,313

£134,656

£144,000

Due to the bespoke nature of our granny annexe buildings, the above matrix is an approximate guide only.

Speak to the granny annexe experts

Looking to start your garden annexe project or have any further questions?

Call us: 01689 818 400
Email us: info@gardenofficebuildings.co.uk
Our Kent showroom is open Mon-Fri by appointment

Why choose us?

  • Turnkey granny annexe solution
  • Ready for you to move in
  • Design and planning permission included
  • Passionate about creating additional living space

Get Started with your Granny Annexe by Garden Office Buildings

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