Garden Annexe Cost Garden Room Pricing Blog

Talk to Us About Your Garden Annexe

We’ll guide you from your first ideas through design, planning and installation. Get in touch for example floor plans, specifications and guide prices. If you would like to see our work in person, ask us about viewing a completed annexe, subject to availability.

The Carlton garden annexe collage showing an external view, open-plan living area and kitcchen.

Garden Annexe Sizes and Prices

Every annexe is designed to order, so sizes vary with your garden and needs. Many customers start from a layout they like, such as our popular Woodside, and make it their own.

One-bedroom annexes, from £85,000
From a compact 26 m² to 76 m² for The Wordsworth, our largest to date. See one-bedroom annexes

Two-bedroom annexes, from £130,000
Typically 55–70 m², with larger designs available. See two-bedroom annexes

Three-bedroom annexes, from £150,000
Like The Burlington Lodge at 6.5 m × 13.8 m. See the Burlington

Prices include VAT where applicable and cover your complete, installed annexe. You’ll get a fixed-price quotation after a free site survey. Read our garden annexe cost guide

Explore Our Garden Annexes

More Design Choices, Better Living Spaces

Choose separate bedrooms, open-plan living, built-in storage or a dedicated utility room. Our fully insulated garden annexes combine everyday comfort with practical layouts for independent living close to family.

Quality Garden Annexes

With over 20 years of experience, we combine premium materials from trusted suppliers with skilled craftsmanship to create comfortable, durable living spaces. From the insulated structure to the kitchen and shower room, we focus on quality throughout your annexe.

Granny Annexes

A fully fitted home in the garden, giving a parent or loved one their own private space with support close at hand. Each design is built around the person who will live there.

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Garden Lodges

Our bespoke garden lodges provide comfortable space for family or guests. Made in our British factory, each lodge is fully insulated for year-round use and installed in your garden.

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Why Choose The Green Room for Your Garden Annexe?

The Complete Garden Annexe Solution

We manage your project from design and planning through to foundations, agreed utility connections and installation. Our garden annexes combine durable construction with everyday comfort, and your fixed-price quotation clearly explains what we include, so you can plan with confidence.

Experienced Annexe Installers

Based in Northamptonshire, we have more than 20 years of experience designing and installing bespoke garden annexes. We typically work within approximately 120 miles of Corby, although we can travel further for suitable projects. To date, we have completed over 100 annexes across 37 counties in England and Wales. More about The Green Room.

Fully Bespoke Garden Annexes

We design every annexe to complement your space, lifestyle, and personal taste. This means your new annexe reflects your needs, preferences, and way of living.

We Handle Planning

We manage planning or Lawful Development Certificate applications where required, including supporting paperwork. Where needed, we also handle Building Control and provide structural calculations.

Full Turnkey Annexes

We take care of everything from foundations and utility connections to plumbing, electrics, and the final fit-out. This means you can enjoy a seamless, smooth build process from start to finish.

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5 Star Rated

We’ve earned a strong reputation for quality, service and craftsmanship. Read our customer reviews to hear about their experience with The Green Room.

First Class Support

You’ll have an experienced team to answer your questions, explain each stage and keep you informed as your annexe takes shape. From your first enquiry to handover, we’re here to help.

 

Explore Our Completed Bespoke Garden Annexes

See how we’ve helped families create comfortable, independent living spaces close to home. Explore the case studies below for layouts, finishes and the stories behind each bespoke annexe, or browse our gallery for more inspiration.

Our Garden Annexe Design & Build Process

Three Steps to Your New Annexe

Free Site Survey → Design & Planning → Installation

We start with a free site survey to understand your needs and assess your garden. We then develop your design, manage the planning or LDC application and build your annexe, keeping you informed through to handover.

1

Free Design & Quote

More Design Choices, More Possibilities

Tell us what you need from your annexe. We’ll assess your garden, discuss layout options and prepare a bespoke design with a clear, fixed-price quotation.

2

Annexe Planning & Site Prep

We manage your planning or LDC application and supporting paperwork. Once the necessary approvals are in place, we prepare the foundations and agreed utility routes.

3

Installation & Completion

Our team builds your annexe and completes the plumbing, electrics, kitchen and shower room. We hand over your fully fitted annexe ready for internal decoration and furnishing.

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Based on 81 Reviews

Quality Garden Annexes Built to Last

Warm, solid and made for everyday living

We build our garden annexes using Structural Insulated Panels (SIPs), combining a strong structure with effective insulation for year-round comfort. Each annexe includes fully fitted living spaces, with materials and finishes chosen around your requirements.

Home Extension Versus Garden Annexe

A home extension adds space to your existing house, while a garden annexe provides separate living accommodation with its own kitchen, shower room and bedroom. For families who want to live close together, an annexe offers privacy and independence with support nearby.

The best choice depends on your garden, budget and family’s needs. Our Caravan Act guide explains one possible planning route for your project.

Frequently Asked Questions About Garden Annexes

How much does a garden annexe cost?

Our fully fitted one-bedroom annexes start from £85,000 and two-bedroom annexes from £130,000, including VAT where applicable. After your free site survey, you’ll receive a fixed-price quotation for your chosen design. See our garden annexe cost guide for a full breakdown.

Do I need planning permission for a garden annexe?

It depends on the design, where it sits and how it will be used. Some projects need a full planning application, while others suit a Lawful Development Certificate (LDC). We’ll find the right route and manage the application for you. Read our planning guide

Can I rent out my annexe?

An annexe is normally used in connection with the main house. Renting it out separately or as holiday accommodation could change its planning status, so let us know at the start if that’s part of your plans.

Do I pay Council Tax on an annexe?

It depends on who lives there and how it’s used. An annexe that’s the main home of a qualifying dependent relative may be exempt. Our Council Tax guide for annexes explains the current rules.

Are service connections included in the cost?

Yes. The agreed water, electricity and foul drainage connections, along with standard trenching, are included in your fixed-price annexe quotation. We assess the service routes during your free site survey and clearly identify any additional work or costs before you commit.

Get in Touch with The Green Room

Our team of down-to-earth experts genuinely care about great garden spaces and excellent customer service. Whether you’re just starting to explore your options or ready to move forward with your project, we’re here to help.