Granny annexe and garden room builds in South Devon
A granny annexe can give a relative their own space close to family, while a garden room can separate work or creative time from the main house. The right building starts with its intended use, not just its footprint. ADB SW welcomes garden annexe and garden room enquiries across South Devon. Send your ideas, site photographs and any drawings so we can discuss the proposed construction and fit-out.
Plan around the person using the space
An annexe for a relative needs a different brief from a garden office or studio. Sleeping, cooking and washing facilities affect the layout, services and approval route. Think about privacy, storage and the relationship with the main house, as well as how someone will move between the two buildings throughout the year. A comfortable room should support everyday routines rather than simply accommodate furniture.
Access deserves attention from the outset. Consider the route through the garden, lighting, door widths, thresholds and the space needed to move around a bathroom or bed. If mobility needs may change, allow for that in the design discussion. For an office or studio, consider desk position, glare, sound, equipment and whether visitors will need access without passing through the house.
Separate planning questions from Building Regulations
Some garden buildings can fall within permitted development, but that does not automatically allow residential accommodation. A granny annexe needs its planning position checked against the intended use, property and design. Size, height, siting, restrictions and any protected status can affect the route. Establish whether permission is needed before ordering a building or committing to a layout that depends on an assumption.
Building Regulations are separate from planning permission. Whether an exemption applies depends on the building and its use; sleeping accommodation changes the considerations. Structure, fire safety, drainage, ventilation and energy performance may all need design input. Agree who will prepare the necessary information and arrange building control involvement. Where an existing consent applies, check its conditions against how the annexe will actually be occupied.
Resolve foundations and services before finishes
Foundations depend on ground conditions, nearby trees, levels and the proposed structure. Existing drains and underground services can influence where a building goes and how it is supported. A sloping garden may need additional groundwork or a carefully designed approach. Investigating these matters early helps distinguish the visible building from the less obvious work needed to make the site suitable.
Electricity, water, drainage and communications need planned routes, not last-minute additions. A bathroom or kitchenette can make the connection to existing drainage particularly important. Discuss heating, hot water, ventilation and electrical demand alongside the room layout. Construction access matters too: narrow side passages, steps and limited storage affect deliveries, excavation and waste removal. Include reinstatement of paths or garden surfaces in the agreed scope.
Make year-round comfort part of the specification
Insulation needs to work across the floor, walls and roof, with attention to junctions, draught control and moisture management. Large windows can bring useful daylight but also unwanted summer heat. Orientation, shading, glazing area and ventilation should be considered together. Heating alone cannot make a poorly detailed garden room comfortable, and simply adding more glazing does not necessarily improve how the space feels.
For a useful quotation, describe the intended occupancy, approximate layout, services and finish alongside the property location and access. Mention trees, changes in level and any known planning constraints. Send drawings if available, but include photographs showing the route from the road to the proposed site. We can then discuss the building work, the investigations needed and which items belong in the written scope.
Common questions
How much does a garden room cost?
Cost depends on size, foundations, access, insulation, glazing, services and internal finishes. A simple workspace has a different scope from an annexe with a kitchen and bathroom. Groundwork, drainage connections and approval requirements also affect the total, so compare quotations against the same specification.
Why is my garden room so hot?
Large areas of unshaded glass, solar orientation, limited ventilation and the roof build-up can contribute to overheating. Equipment adds heat too. Assess shading, glazing, insulation and airflow together rather than assuming a cooling appliance will resolve the underlying comfort problem.
Can a garden office become a granny annexe?
Not automatically. Sleeping and residential use can change the planning and technical requirements. The existing structure, insulation, access and services also need assessment before a workspace is treated as suitable accommodation.
Tell us about your project
Send the property details and the work you have in mind so the scope can be discussed before a quote is agreed.