Backland Development
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Build a home for family in your garden in Machynlleth

For grown-up children in Machynlleth, 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 Powys County 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
Powys County Council
Postcodes
SY20
Noon sun, 21 March
About 37°
Shadow from a 5 m eaves line
About 6.5 m
Planning plan
LDP
County
Powys

Before you decide in Machynlleth

A measured survey is where a family home in Machynlleth 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 37° at midday here, a 5 m eaves line throws a noon shadow close to 6.5 m; drawing that onto the survey shows which positions keep light in the main rooms of both homes. Powys County Council will expect to see the same evidence with the application.

Section showing noon sun and shadows in Machynlleth: about 37 degrees on 21 March and 14 degrees on 21 December21 m21 Mar, noon: sun 37°, shadow 6.5 m21 Dec, noon: sun 14°, shadow 20.1 mExistingNew home
This section is worked out for the latitude of Machynlleth: around 37° of sun at midday in late March and about 14° at midwinter. It shows why the gap between your house and a new home behind it is about light as well as privacy. Garden assumed to face north.

How we’d take it forward in Machynlleth

From first call to keys, a family home in Machynlleth follows a clear order. Free appraisal and site visit; measured survey and design around the person moving in; a planning application to Powys County Council; approval under the Building Regulations as they apply in Wales 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. Build and handover

    We build while you carry on living next door, with access, deliveries and working hours agreed up front. At handover you get the completion certificate and the paperwork you’ll need for council tax, lenders and any VAT claim.

Worth checking early

  • Family plans change: agree ownership, costs and what happens if circumstances change in writing, with a solicitor.
  • A separate home needs its own garden, parking, bins and access, so it needs more land than an annexe.
  • Planning is the council’s decision, and an annexe is not a way round the rules that apply to a new house.

Questions about garden plots in Machynlleth

Will an annexe in Machynlleth put up my council tax?

It might. Annexes can be banded separately, but exemptions exist for annexes lived in by certain dependent relatives, and in some cases a discount applies where family live there or the annexe is used as part of the main home. Who qualifies depends on the relative’s circumstances and how the annexe is used. Powys County Council’s council tax team can tell you how the rules apply to your household.

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

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 Powys County 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.

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

Yes, almost always for a detached annexe with its own kitchen, bathroom and bedroom. Powys County 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.

Is CIL payable on a family home in Machynlleth?

Only if Powys County 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.

Other options in Machynlleth

Family home in your garden near Machynlleth

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