The 5 Best Granny Annexes in the UK for 2026
There are many companies in the UK selling something they call a granny annexe. The quality, the service,competitive, and what you actually get for your money vary enormously. We have done the research so you do not have to. Here are the five best options in the UK right now, ranked honestly.
Based on build quality, transparency of pricing, service model, product range, and customer feedback, here is our honest assessment of the main providers in the UK market right now.
01. Garden Annexes by GX Modular
Top Pick
Bury St Edmunds, Suffolk. Nationwide installation.
Garden Annexes is the most complete offer in the UK market. Four beautifully designed ranges in 24 sizes each, manufactured in-house using precision CNC equipment to 0.1mm tolerance. The walls are 222mm thick with 100mm insulation as standard. Every annexe comes with a Bosch-appliance kitchen, bathroom, double glazing, flooring, decoration, and full service connections included in the price.
The no-outsourcing model is what genuinely sets Garden Annexes apart. Every specialist involved in your project, from the planning consultant to the decorator, is a member of the in-house team. There are no subcontractors. That means one company is fully accountable for everything from first conversation to final handover.
The Lawful Development Certificate is handled as part of the turn-key service with a 96% success rate. The four ranges cover every taste: the Annexxa for clean European modernist value, the XB for contemporary luxury, the St George for classic British character with a vaulted ceiling, and the Ivyo for barn-style warmth with exposed rafters. A typical one-bedroom project comes in at around £85,000 to £104,000 all-in, depending on range and size.
Three fully built annexes are on permanent display at the Suffolk display area, open seven days a week by appointment. That is something very few providers offer.
Starting from £85,000 fully installed. Free site survey and fixed price with no obligation. Call 0800 368 9781.
02. Homelodge
Winchester, Hampshire. Nationwide installation.
Homelodge has been building bespoke annexes for nearly 40 years. They handle the Lawful Development Certificate and operate with their own team. Their bespoke-only approach means no published range of sizes, longer lead times, and less pricing transparency upfront. For families who want a clear range of options and a fixed all-in price from day one, Garden Annexes is the stronger choice.
03. Grannexe
Kent. Primarily covering Kent and London.
Grannexe has been producing annexes for a few years, but their background is mostly in garden rooms rather than full residential annexes. Their main limitation is geography, as they primarily serve Kent and London. If you are outside that area, Garden Annexes offers genuine nationwide coverage with significantly more choice across four ranges and 24 sizes.
04. Vita Modular
Warwickshire. Nationwide installation.
Vita Modular uses a structural steel frame system and advertises a six-week lead time from order. Their pricing is competitive but key information like the guarantee period and LDC process is not clearly published. The limited range of styles and the industrial feel of the steel frame aesthetic will not suit every family or garden. Garden Annexes offers more choice, more transparency, and a warmer finish at a comparable price point.
05. Swift Living Annexes
Nationwide. Bespoke SIP-built designs.
Swift builds with SIP panels and offers fully bespoke designs. The bespoke approach means slower timelines and less pricing transparency upfront. For families who want a clear range of tested designs with a fixed all-in price, Garden Annexes remains the stronger choice.
Side-by-Side Comparison
Frequently Asked Questions
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Garden Annexes by GX Modular is the top choice for most families in 2026. They offer 96 options across four ranges and 24 sizes, the most transparent all-in pricing from £85,000, a fully in-house team with no outsourcing, and three real homes you can walk through before you commit. Backed by a 10-year guarantee and a 40-year minimum lifespan.
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A well-built, fully installed granny annexe from Garden Annexes starts from £85,000. That includes the building, kitchen, bathroom, foundations, service connections, installation, and council certification. Be cautious of prices significantly lower than this, as they almost always exclude major cost items.
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Yes. Garden Annexes has three fully built homes on permanent display near Bury St Edmunds in Suffolk, open seven days a week by appointment. Call 0800 368 9781 to book a free visit with no obligation.
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In most cases, no. A Lawful Development Certificate is the standard route and Garden Annexes handles the full application on your behalf as part of the turn-key price. They have a 96% success rate on these applications.
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For most families, yes. The cost of a Garden Annexe is typically recovered within two to three years compared with private residential care fees of £35,000 to £50,000 per year. The annexe then continues to add value to your property for decades.
Ready to see the best for yourself?
Walk through a real annexe before you decide
Three fully built homes are on permanent display near Bury St Edmunds. Or download the full 2026 brochure with every range, size, and price in one place. homes are
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