Cube
Our most popular choice for clients wanting a beautifully-crafted, elegant and functional garden room.
From £17,210 inc. VAT & installation
View the Cube
Garden rooms · Garden offices · Annexes · Since 2008
Building beautiful garden rooms across Sussex and Surrey
Add space, value and lifestyle without moving home. We can create your dream garden retreat in days.
5-star reviews on GoogleRead what our customers say- 10 year guarantee on every build
- Prices include VAT, foundations & electrics
- Most garden rooms need no planning permission
- Free design consultation & site survey
2008Building beautiful garden rooms since
45 yearsCombined experience in our team
10 yearsGuarantee on every garden room and annexe
6 monthsAfter-care visit to check everything is perfect
About us
Bespoke garden rooms, offices and annexes, built to stand the test of time
At The Garden Room & Annex Company, we take pride in designing and building high-quality, bespoke garden rooms, offices and annexes that are built to stand the test of time.
Our team have a combined 45 years of experience building garden rooms and annexes in the Sussex and Surrey area. We have refined our construction methods over this time with innovative insights from our peers and industry leading designers, manufacturers, builders and carpenters.
Our garden rooms are built using advanced Structurally Insulated Panels (SIPs), providing superior strength, insulation, and efficiency – allowing for rapid construction in just a few days. We have a transparent pricing policy so you have peace of mind that there are no hidden extras.
Our ranges
Six designs, all fully customisable
Every one of our ranges is designed by our own team and can be tailored to your garden, budget and how you want to use the space. All prices include VAT, delivery and installation.
Aspect
A full-size picture window on the side adjacent to the door, for a full view of your garden and as much light as possible.
From £18,049 inc. VAT & installation
View the Aspect
Panama
Built like the Cube, with an additional 60cm overhang along the front and 3 recessed LEDs: shelter from the rain and shade from the sun.
From £17,704 inc. VAT & installation
View the Panama
Portico
A 60cm overhang with walls on either side for a recessed look, giving protection from the weather as well as privacy. Very stylish.
From £19,527 inc. VAT & installation
View the Portico
Apex
Our largest style of garden room, with an apex roof and a triangular front window. Ideal as an annexe, guest room or golf simulator room.
From £31,113 inc. VAT & installation
View the ApexAnnexe
Open-plan studios or partitioned layouts, complete with kitchen, shower room, heating and electrics. Ready to move into: just add furniture.
From £61,050 inc. VAT & installation
View the AnnexeOur services
Everything included, from foundations to flooring
We build a fully-finished garden room – from foundations to flooring – ready for you to move in and personalise your new outdoor space.
- Free design consultation and site survey
- In-house design team & planning consultant
- Foundations and electrics included
- Fully insulated – warm in the winter, cool in the summer
- Professional internal finish: flooring laid, heater installed and walls painted
- Transparent pricing with no hidden costs
- No planning permission required on the vast majority of our garden rooms
- Planning consultancy service and building regulations compliant
- Finished to a high standard, ready for you to move in
- Upgrades available to make your garden room unique to you
Why choose us?
A trusted, local, family-run company
10 year guarantee
A trusted local company with many years experience offering a 10 year guarantee.
Ready to move in
We build a fully-finished garden room – from foundations to flooring – ready for you to move in and personalise your new outdoor space.
Unique after-care pledge
Our team will return after 6 months to make sure your garden room is still as perfect as the day we handed over the keys.
Tailor-made for you
Our garden rooms are designed and tailor-made just for you.
Absolutely blown away by our new garden room. Grant and the team were quick, professional, on-time (in fact beat the expected deadline) and we ended up with a fantastic office/garden room. Very very pleased with all aspects. They also dealt with every last minute change we threw at them. Offered advice on local regulations. Suggested design improvements. We love it and could not recommend any more highly.
Every garden room, annexe and extension we build meets exacting standards and is backed by our 10 year guarantee, ensuring long-lasting quality and customer satisfaction. Our annexes and extensions are designed and built to exceed building regulations and have a life expectancy of more than 50 years. Where permitted development rights are not applicable, our own in-house planning team can advise and complete the planning application process on your behalf.
Our approach
From first chat to finished room
- 1
Talk to us
Our team will take the time to understand your garden room needs and help you choose the perfect solution, whether it’s a functional garden office or a spacious multi-room annex.
- 2
Free home visit
We offer a free, no obligation home visit to provide expert advice on design options, add-ons, pricing and solutions tailored to you and your budget to create your ideal garden room or annex.
- 3
Quotation
After completing the site survey and understanding your requirements, we will provide you with a detailed, fully itemised quote. We take pride in offering transparent pricing with no hidden costs.
- 4
Start building
The average build time is approximately 10 working days, depending on any additional services required. Lead times may vary based on the season, as well as the size and design of your garden room project.
The team at The Garden Room & Annex Company did a fantastic job building our new annexe. It looks great and all the guys involved in the build were a pleasure to be around. They were friendly, polite and most importantly went the extra mile to make sure everything was perfect. Would highly recommend!
Golf simulators
Bring the fairway to your doorstep
Practice, play and entertain – all from the comfort of your own garden. We design and build dedicated golf simulator garden rooms that let you perfect your swing all year round, working with top simulator manufacturers.
- Minimum 3m internal height for a full swing
- Planning applications handled by our in-house team
- Add a bar, kitchenette, WC or air conditioning
Case studies
Recent projects
Yoga studio (Panama range)
Yoga Studio, Steyning
Linda was looking for a quiet, contemplative space for her daily yoga practice, so we cleared an unused, overgrown area in the corner of the garden to build her a 4.5m x 3m studio.
Read the case study
Garden office with storage
Home Office and Storage Shed, Hove
Dom often works from home and wanted a tranquil space to focus on his travel business. We designed a lovely garden office with the main room 2.4m deep and a storage area to the side.
Read the case study
Barn conversion & pool house
Barn Conversion – Haywards Heath
This disused outbuilding was crying out for a conversion, so we transformed this neglected barn into a beautiful space for Nikki and her family in sunny Sussex, ready in time for summer!
Read the case studyTake a look
See one of our finished garden rooms
Fully insulated, double glazed and finished inside and out. We can landscape the area around your new room too – our in-house garden designer will create the ideal setting for your new garden room or annex.
95%
of our garden rooms don’t need planning permission
They meet the conditions for Permitted Development. If yours does need planning, our in-house planning consultant prepares and submits the whole application for you.
Areas we cover
Garden rooms across Sussex & Surrey
Brighton & Hove Worthing Lewes Haywards Heath Burgess Hill Crawley Horsham & Steyning Eastbourne Surrey
Advice & inspiration
From our blog
Why Autumn is the Perfect Time to Build a Garden Room in Sussex
If you’ve been considering a garden room in Sussex, autumn could be the perfect time to turn that idea into reality.
Read articleWhy Choose The Garden Room & Annex Company Over Other Garden Room Companies in Sussex and Surrey?
When you’re investing in a garden room, garden office, studio, or annexe, choosing the right Garden Room Companies in Sussex and Surrey is just as important as choosing…
Read article
The Benefits of Garden Annexes in Brighton & Hove
Why Local Homeowners Are Investing in Extra Space Garden annexes in Brighton & Hove are quickly becoming one of the most desirable home upgrades for modern homeowners in…
Read articleFAQs
Questions we’re often asked
Do you need planning permission?
Planning permission isn’t usually required for a garden room, as the majority of our buildings fall under permitted development (under 2.5m high externally within 2m of a boundary). Most properties apart from flats and listed buildings have permitted development rights, but we can check this for you. Rest assured, if you find that you need planning, our team can provide a full planning service and will be happy to carry out application on your behalf.
Does the cost of my Garden Room or Annex include VAT?
Yes, our transparent pricing include everything, from foundations to decorations... and VAT!
What access do you need to install a Garden Room or Annex?
All doors and windows, and our 2.4m long x 1.2m wide panels will need to fit through or down the side of the house to the site.
Are your Garden Rooms & Annexes warm in the winter?
Our garden rooms stay comfortably warm in winter and cool in summer, making them perfect for work or leisure, come rain or shine. Our garden rooms are well insulated and have double-glazed doors and windows to ensure optimal thermal regulation. This insulation is comprehensively installed in every part of the building – the floor, walls, and ceiling, maintaining a cosy environment during the colder months.
Do your Garden Rooms and Annexes come with a guarantee?
Our garden rooms come with 10 year guarantee, giving you peace of mind that in the unlikely event of anything occurring we will return to make it right!
Free quote
Tell us about your garden room
Send us a few details and we’ll arrange your free, no-obligation design consultation and site survey. Prefer to talk? Call or WhatsApp us any time.
- Call or WhatsApp for a chat07949 515394
- Email to arrange a site visithello@gardenroomannex.co.uk
- Based in Hove, coveringSussex & Surrey
