Backland Development
0800 088 6248Free to call Free plot appraisal

Build a home for family in your garden in Southampton

For grown-up children in Southampton, the step to a first home can be a long one. If your garden is big enough, a small separate house on part of it could become theirs: with its own planning permission and title, it can be mortgaged in their name and sold when they move on.

That asks more of the plot than an annexe does, including its own garden, parking and an access Southampton City Council will accept. We look at all of that in a free plot appraisal, then design and build the home if the scheme stacks up and you want to go ahead.

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Single-storey garden home with wide glazed doors and a covered porch at the back of a family garden
Planning authority
Southampton City Council
Postcodes
SO14, SO15, SO17, SO18, SO19
Noon sun, 21 March
About 39°
Shadow from a 5 m eaves line
About 6.2 m
Planning plan
Local Plan
County
Hampshire

Southampton: light, access and policy

A measured survey is where a family home in Southampton stops being an idea and becomes a plan. We record boundaries, levels, trees, drains and the windows of your house and the houses next door, then test where the new building can sit. With the spring equinox sun standing near 39° at midday here, a 5 m eaves line throws a noon shadow close to 6.2 m; drawing that onto the survey shows which positions keep light in the main rooms of both homes. Southampton City Council will expect to see the same evidence with the application.

Section showing noon sun and shadows in Southampton: about 39 degrees on 21 March and 16 degrees on 21 December21 m21 Mar, noon: sun 39°, shadow 6.2 m21 Dec, noon: sun 16°, shadow 17.8 mExistingNew home
Noon sun in Southampton on 21 March sits about 39° above the horizon, so a typical two-storey eaves line (about 5 m) throws a shadow of roughly 6.2 m. In December the sun is only about 16° up and shadows stretch much further. Drawn for a garden facing north, where it matters most.

The next steps, locally

From first call to keys, a family home in Southampton follows a clear order. Free appraisal and site visit; measured survey and design around the person moving in; a planning application to Southampton City Council; approval under the Building Regulations and any CIL exemption claimed before work starts; then the build, with you living next door throughout. You receive a written quote after design and survey, and we keep the household updated at each stage.

  1. Free plot appraisal

    We look at your plot, access and the planning picture from the desk, talk through who will live in the new home, and visit if it looks viable. There’s no cost and no obligation.

  2. Annexe or separate home

    We set out both routes for your plot, covering what each means for planning, ownership, council tax, CIL and VAT, so you can decide with your family and advisers before design starts.

  3. Survey and design

    A measured survey, then a design built around the person moving in: step-free routes, a ground-floor bedroom if needed and privacy for both households. You get a written quote after design and survey.

  4. Planning and approvals

    We prepare and submit the planning application and manage it with the council, which makes the decision. Before work starts, approval under the Building Regulations is in place and any CIL exemption has been claimed.

Worth checking early

  • An annexe tied by planning condition usually can’t be sold or let separately, which limits flexibility later.
  • A separate home needs its own garden, parking, bins and access, so it needs more land than an annexe.
  • Family plans change: agree ownership, costs and what happens if circumstances change in writing, with a solicitor.

Your questions, answered for Southampton

Do I need planning permission for a granny annexe in Southampton?

Yes, almost always for a detached annexe with its own kitchen, bathroom and bedroom. Southampton City Council will treat it as accommodation linked to your home and will usually add a condition so it can’t be let or sold separately. A garden building used only as a home office or gym is a different matter, but sleeping and cooking take it beyond those allowances.

How much garden do I need for a family home in Southampton?

There’s no fixed figure. A single-storey annexe close to the house can work on a smaller plot than a separate dwelling, which needs its own garden, parking and access. What matters is whether Southampton City Council can be satisfied on privacy, daylight and the space left for both homes. The free appraisal gives you a first view based on your plot’s actual shape and access.

Is CIL payable on a family home in Southampton?

Only if Southampton City Council has adopted the Community Infrastructure Levy, which its website will confirm, and we check it for you during the appraisal. Where it applies, self-build and residential annexe exemptions exist, but both must be claimed before work starts and can be withdrawn if the home is sold or let within three years of completion.

Can I reclaim VAT on a family annexe in Southampton?

Often not. HMRC’s guidance gives an annexe that can’t be used or sold separately from the main house as an example of work that can’t be zero-rated, and the DIY housebuilders refund scheme asks the same question. A separate dwelling is usually treated differently. Take advice from a tax adviser before you settle the planning route, because the wording of the permission matters.

Other options in Southampton

Family home in your garden near Southampton

Find out what your garden could become

Free garden plot appraisal. No cost, no obligation, and a straight answer if it won’t work.

Get my free appraisal 0800 088 6248