You want Mum or Dad closer, but moving them into the spare bedroom doesn’t feel right. They’ve got their own routine. You’ve got yours. A granny pod in the garden could give you more time together, with a front door to close when either of you wants some peace. It’s an appealing idea, provided everyone wants the arrangement. Before choosing a building, talk about what living nearby would actually look like, then work through the permissions, costs and construction. What is a granny pod? A granny pod is usually a small garden building arranged as living accommodation, often with a bedroom, bathroom and kitchen area. You’ll also see “granny annexe”, which can include accommodation attached to the house. Options include a purpose-built annexe, a converted garage or a modular unit made off-site. The name doesn’t decide its planning status, and a garden office with a bed added isn’t automatically suitable for someone to live in. Why families consider a granny annexe Their own space, with help nearby Having somewhere to make breakfast, watch television or invite a friend round matters. An annexe can let a parent keep those ordinary freedoms while making it easier to help with shopping or pop over when something needs sorting. Let them help choose the layout, with space for familiar furniture and somewhere to sit with a garden view. Position windows so both households have privacy. Having family close should still leave room for a life of their own. More time together, less arranging A cup of tea doesn’t need to become a planned visit. Grandchildren can drop in after school, and sharing a meal can be as simple as walking across the garden. Privacy still needs thought. Agree expectations about visits and support before building. Being nearby shouldn’t mean anyone feels permanently on call. Room for needs to change A single-storey layout gives you a chance to plan around everyday movement from the start. Leave space beside the bed and in the bathroom for help if it’s needed later, and consider easy-to-reach storage and controls. Suitable accommodation and support may help a relative stay independent for longer, but an annexe doesn’t replace care they need. Discuss who could help if their needs change. The building might later suit an adult child or home office. Check the permission and any occupation conditions before assuming another use is allowed. Do you need planning permission for a granny annexe? A new permanent garden annexe for someone to live in will generally need planning permission. The details depend on the property and intended use; don’t rely on a supplier’s general promise that a pod needs no permission. In England, ordinary outbuilding permitted-development rules don’t cover separate self-contained living accommodation. The familiar 2.5-metre limit near a boundary is not a shortcut to permission for a home. Check Planning Portal’s outbuilding guidance and speak to your local planning authority. An annexe connected to the main household is different from a separate dwelling. Explain who will live there, how facilities will be shared and whether future letting is intended. Conditions may restrict separate occupation. Scotland, Wales and Northern Ireland have different planning systems. Conversions and movable units also need advice specific to the proposal. Make it comfortable for everyday living Building Regulations are separate from planning permission. A permanent residential annexe will normally need approval; in England, the usual small-detached-building exemptions require no sleeping accommodation, alongside other conditions. Agree the requirements with your designer and building control team. Start with the route to the front door. It needs to work on a wet winter evening, potentially with a walking frame. Consider lighting, suitable thresholds and space to move around bathroom fittings and furniture. Ask for a cost breakdown covering foundations, utility connections, fitting out and delivery. A modular pod’s advertised price may leave some of these out. Check how it will reach the garden, too, and budget for ongoing heating and maintenance. Insulation, ventilation and heating need designing together. Allow for shower steam, cooking and summer heat, as well as cold weather. A small building still needs to be a comfortable home throughout the year. Will there be a separate council tax bill? A self-contained annexe can be separately banded. In England, qualifying family annexes may receive a 50% reduction, while an exemption can apply when occupied as the main home of a qualifying dependent relative. That definition includes a relative aged 65 or over, or someone who meets the specified disability criteria. BCP Council explains the annexe discounts and exemptions. Ask your own council what applies; arrangements differ across the UK. Plan the roof before settling on the height A flat roof can keep the building’s profile lower than a pitched design. Leave room for the structure, insulation and drainage falls when agreeing the overall height. Squeezing these in afterwards can compromise the design. Decide where rainwater will go, with gutters accessible for cleaning. The waterproof covering is only part of the roof: the deck, condensation control and complete assembly’s fire performance also need checking. GRP fibreglass GRP forms a rigid covering from resin and glass reinforcement, finished with topcoat. It can suit a new annexe with a sound, correctly specified deck. Installation needs suitable weather and careful preparation. Our fibreglass roofing guide explains the work involved. When looking at our GRP roofing kits, include the compatible edge trims and flashings in your materials list. EPDM rubber EPDM is a flexible rubber membrane. A simple rectangular roof may take a single sheet, depending on its dimensions. Our EPDM roofing range includes membranes, kits and accessories. It still needs a sound deck, suitable adhesives and properly finished edges and outlets. Choose around the roof design and the installer’s experience; neither material makes up for poor detailing. Before you order Agree how the arrangement will work for everyone. Confirm planning, Building Regulations and council tax separately. Budget for foundations, connections and delivery access. Allow for changing mobility and support needs. Finalise the roof dimensions, insulation and drainage. Got a roof sketch and measurements? Call us on 0800 612 7903 and 01803 523 689, or send us your annexe roof details. We can help you work out which roofing materials you’ll need.
