ADACON UK

    Can I Put a Granny Flat in My Garden?

    Often you can, but it depends on the space, the route in, connections to the house and — most importantly — planning. A self-contained granny flat is not automatically permitted development just because it sits in the garden.

    Adacon Technical Team · Published

    Space and position

    A single P600 module is 5.9m x 2.2m externally; annexes of two or more modules need more room. Leave space around the building for access and maintenance, and think about privacy and neighbours.

    Getting it into the garden

    Modules arrive finished, so there must be a suitable route or a planned crane lift. Photos of the access let us review this with you.

    Services

    Power, water and drainage usually run from the main house. The distance and the drainage route affect groundworks.

    Planning and use

    How the building is used matters: an annexe used as part of your household is assessed differently from a separate home. Speak to your local planning authority early.

    Worth knowing: Planning, Building Regulations and council tax depend on your site and how the annexe will be used. Confirm with your local planning authority and building control before ordering.

    Where to go next

    P300 / P400 / P600 range

    P300 unit
    2.9m × 2.2m externally; approximately 2.7m × 2.0m usable internally
    P400 unit
    3.9m × 2.2m externally; approximately 3.7m × 2.0m usable internally
    P600 unit
    5.9m × 2.2m externally; approximately 5.7m × 2.0m usable internally
    Configuration
    Mix P300, P400 and P600 units to create tailored footprints and shapes
    Unit height
    2.40m external / 2.16m internal
    Storeys
    Up to two storeys, subject to final project design
    Delivery
    UK mainland and Northern Ireland — transport quoted separately

    Adacon modular buildings use P300, P400 and P600 units with external lengths of 2.9m, 3.9m and 5.9m, a common 2.2m width and 2.40m external / 2.16m internal height. The sizes can be combined to create more tailored floor areas and building shapes, joined side by side or stacked to two storeys subject to the final project design.

    Design your modular building online

    Set the layout, windows, doors and fit-out and see a live estimate as you go.

    Open the modular builder

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