Garden Annexes 25sqm to 35sqm in Size
Updated: 9 March 2026
On this page, we are featuring garden annexe projects between 25 and 35 square metres in size. These annexes offer more spacious living areas compared to the smaller projects (under 25sqm) that we showcase here. These projects, completed by various companies, showcase how skilled designers can make the most of every square metre, whether the annexe is used for guest accommodation, independent living, or as a multifunctional space. With the larger floorplans, some designers have incorporated partition walls to create multiple rooms, allowing for separate living areas and bedrooms.
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Each project has been tailored to meet the owner’s specific requirements and the available space in their garden. Some of these annexes serve as guest bedrooms with en-suite facilities, providing flexibility for when friends or family visit. Others are self-contained living annexes, allowing a relative to live independently while remaining close to the main house.
These garden annexes have been designed to comply with either Full Planning Permission and Building Control regulations for permanent residences, or have been classified as mobile homes under the Caravan Act. In the latter case, a Lawful Development Certificate confirms their legal status, ensuring that they meet all necessary regulations for use as independent living spaces.
We hope these projects inspire you and give you a clear idea of the different spaces that can be created within this footprint range. The projects are listed by size, from smallest to largest.
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This page looks at annexes between 25sqm and 35sqm:
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This 25.8 sqm self-contained bedroom annexe, designed by Executive Garden Rooms, provides a spacious and fully equipped guest suite. Built on a 6m x 4.3m footprint, this turnkey project includes a large open-plan room with space for a double bed, storage, and seating, plus a modern kitchenette and en-suite shower room. Executive Garden Rooms handled the entire process, from design and securing Planning Permission to final decoration and mains service connections. The high-spec interior includes LED downlights, an electric wall heater, and a Cat6 data point, ensuring year-round comfort for guests.
This 27.3 sqm granny annexe, designed by Annexe Spaces, offers a comfortable one-bedroom home at the bottom of the garden. Measuring 4.37m x 7.5m with a 2.8m height, the annexe includes an open-plan living room with an L-shaped kitchen, a utility cupboard, and an en-suite double bedroom. Large floor-to-ceiling windows and a skylight flood the space with natural light, while a level composite decking path connects the annexe to the main house, ensuring accessibility. Clad in low-maintenance Cedral Click in Grey Green, the annexe features a contemporary, durable exterior. Annexe Spaces provided a fully project-managed service, handling Planning, Building Control, and groundworks.
This 27.88 sqm self-contained garden annexe, designed by Swift Unlimited, maximises space while delivering a functional, high-spec living area. Measuring 6.8m x 4.1m, the annexe includes a compact double bedroom, a kitchenette, and a narrow shower room with a space-saving pocket door. A Velux roof window brings natural light into the bedroom, creating an open and airy feel. The annexe also features a storage room cleverly concealed within the Cedar cladding and is topped with a striking sedum living roof. Swift Unlimited managed the entire project, from design and Full Planning Approval to construction and utility connections signed-off by Building Control.
This 30 sqm self-contained holiday let annexe, designed by Miniature Manors, showcases how a garden building can be designed to provide a regular income stream with the right permissions. Replacing an old garage, the annexe includes a large living space with a double bed, seating area, and French doors opening onto a decked terrace. A well-equipped kitchen and modern shower room complete the layout. With its contemporary exterior and bright, plastered interior, the annexe offers a stylish retreat for guests. Miniature Manors handled Planning and Building Control approvals, ensuring the annexe met all regulations.
This 30 sqm family garden annexe, designed by Ark Design Build, offers a versatile, light-filled space for the entire family. Featuring a spacious main room with a modern kitchen, shower room, utility room, and storage, the annexe is fully self-contained. The pitched roof design complements the surrounding garden and incorporates skylights that flood the interior with natural light. Built in compliance with Permitted Development regulations, the annexe balances style with practicality. High-spec finishes, such as herringbone flooring and exposed timber beams, add character. Ark Design Build managed every aspect, from design to utility connections, ensuring it met Building Regulation standards for sleeping accommodation.
This 30 sqm five-sided garden annexe, designed by Executive Garden Rooms, maximises space in an irregularly shaped garden. Built as a one-person home, the open-plan layout features zones for cooking, dining, living, and sleeping, with a half-height wall defining the bedroom area. The annexe includes a modern kitchen, a spacious shower room, and a pressurised water system for consistent water pressure. Finished with a contemporary off-white render and grey aluminium doors and windows, the annexe blends style and practicality. Executive Garden Rooms handled Planning Permission, Building Control, and all groundworks as part of their turnkey service.
This 30 sqm one-bedroom annexe, designed by Ark Design Build, offers a clever solution for an awkward-shaped garden. Featuring an angled rear wall that matches the garden’s boundary lines, the layout includes a spacious main room with a kitchen and storage area, and a generous bedroom with an en-suite shower room. Large sliding doors and high-set windows flood the interior with light and provide access to the garden. Ark Design Build managed the entire project, from design and Planning Approval to groundworks and utility connections, ensuring a seamless, fully commissioned build.
This 31.2 sqm pitched roof granny annexe, designed by Annexe Spaces, demonstrates how a compact space can feel open and inviting with vaulted ceilings and a light-filled design. Built for a gentleman seeking independent living while staying close to family, the annexe features a spacious living area with a well-equipped kitchen, a double bedroom, and an en-suite shower room. The exterior, rendered in cream with dark grey doors and windows, evokes a contemporary cottage feel. Annexe Spaces provided a full turnkey service, managing everything from design and Planning Approval to final utility connections.
This 31.5 sqm one-bedroom garden annexe by Swift Unlimited provides a comfortable, self-contained home with defined living and sleeping areas. Designed for a family in Dorset, the annexe offers independent living for their adult son while keeping support close by. The contemporary exterior features durable Douglas Fir cladding and a striking glazed corner with two sets of sliding doors, maximising light and garden views. Inside, high-quality finishes include reinforced walls for mounted TVs, a compact kitchenette, and a well-appointed en-suite shower room. Space-saving pocket doors enhance functionality. Swift Unlimited handled the entire project, from design and planning to full build and decoration, delivering a ready-to-move-into home.
This 32.24 sqm one-bedroom garden annexe, designed by Executive Garden Rooms, offers a comfortable and independent living space for an older gentleman at the end of his family’s garden. Measuring 6.2m x 5.2m, the annexe features an open-plan living area with a compact yet well-equipped kitchenette, a spacious shower room, and a bedroom with large windows for natural light. The annexe is finished with low-maintenance Cedral cladding, while the interior boasts floor-to-ceiling glazing and durable wooden flooring. Executive Garden Rooms managed the entire project, from Planning Permission to final connections and Building Control approval.
This 32.6 sqm garden granny annexe by Executive Garden Rooms was designed as a self-contained home for a client’s mother, allowing her to live independently while staying close to family. The 7.25m x 4.5m building features a spacious living area with a well-equipped kitchenette, a double bedroom with an en-suite shower room, and French doors offering views of the garden. Pocket doors maximise space, while air conditioning and a pressurised water system ensure year-round comfort. Executive Garden Rooms managed the entire project, from design and Planning Permission to groundworks and final utility connections.
This 33 sqm garden annexe, designed by JML Garden Rooms, offers a self-contained living space for a family in Scotland, providing independent accommodation for their mother. The annexe includes a spacious living room with a vaulted ceiling, a galley-style kitchen, a bedroom, and a shower room. Built using highly insulated SIPs (structural insulated panels), the building was constructed off-site for quick assembly, becoming wind and watertight within two weeks. JML Garden Rooms provided a full turnkey service, handling groundworks, Planning Permission, and utility connections, ensuring a smooth project from start to finish.
This 33.75 sqm two-room annexe by Executive Garden Rooms offers a versatile living space, thoughtfully designed for family use. It features a light-filled main room with a bespoke kitchenette, a separate shower room, and an airing cupboard with a pressurised water system for consistent hot water. Corner glazing floods the living space with natural light and connects it seamlessly to the garden, while a picture window in the second room frames garden views. Clad in low-maintenance black Cedral boards for a bold, modern look, this turnkey project was tailored to meet the family’s needs and left move-in ready.
This L-shaped granny annexe, designed by Booths Garden Studios, offers a spacious and light-filled home that can be installed under the Caravan Act. Measuring 34.2 sqm, the annexe consists of two sections: 7.31m x 3.65m and 3.65m x 2.43m, creating a flexible open-plan living space with a double bedroom. Extensive floor-to-ceiling glazing fills the home with natural light, while a sleek kitchen and modern shower room complete the interior. Booths Garden Studios managed the entire project and offers a 25-year maintenance-free guarantee on their buildings.