Backland Development
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Building in a large rear garden in Treharris

Not every long garden in Treharris should be built on, and we’d rather tell you that early. A deep plot with a narrow side gap, a steep slope or a big protected tree may be better left as garden. Others have enough depth and a usable way in to take a well-placed new home.

Our free appraisal sorts one from the other. If yours works, you can part with the land while staying in your house, agree an option or a conditional sale, or keep it and have us design and build. If it doesn’t, you’ve lost nothing but a conversation.

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Overhead view of three long, narrow back gardens with lawns, a greenhouse, vegetable beds and sheds
Planning authority
Merthyr Tydfil County Borough Council
Postcodes
CF46
Noon sun, 21 March
About 38°
Shadow from a 5 m eaves line
About 6.3 m
Planning plan
LDP
County
Mid Glamorgan

Treharris: light, access and policy

Overshadowing is often the deciding issue in a long garden. At midday on 21 March the sun in Treharris stands about 38° above the horizon, so a typical two-storey eaves line throws a shadow of roughly 6.3 m. In midwinter the noon sun is only about 15° up and shadows stretch around three times as far.

That’s why the gap between a new home and neighbouring gardens matters, and why a lower roof, or a home set further from the boundary, can make a scheme acceptable. We check the shadows on your actual plot rather than relying on rules of thumb.

Section showing noon sun and shadows in Treharris: about 38 degrees on 21 March and 15 degrees on 21 December21 m21 Mar, noon: sun 38°, shadow 6.3 m21 Dec, noon: sun 15°, shadow 18.8 mExistingNew home
This section is worked out for the latitude of Treharris: around 38° of sun at midday in late March and about 15° 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.

What happens next in Treharris

Once you’ve had the free appraisal, nothing moves without your say-so. For a sale, terms are agreed in writing before you sign anything. For a build, design and survey come first and the quote follows. In both cases the planning application goes to Merthyr Tydfil County Borough Council, which consults your neighbours before deciding. Small schemes often take a few months from submission, and surveys or design changes can add more.

  1. Free plot appraisal

    We look at your garden using maps, the title plan and the planning history around you, then talk it through with you. If it looks workable we arrange a site visit. There’s no cost and no obligation.

  2. Choose your route

    You decide whether to sell the plot outright, sell subject to planning, grant an option, team up with neighbours, or keep the land and have us design, get planning for and build a home on it.

  3. Planning application

    We prepare the drawings and reports, usually take pre-application advice, and submit. The council consults neighbours and decides. Small schemes often take a few months from submission, longer if surveys or amendments are needed.

  4. Sale or build

    If you sell, your solicitor handles the transfer of part and your lender’s release of the plot. If you build, we give a written quote after design and survey, then build and hand over the new home.

Worth checking early

  • A covenant, a mortgage, a public sewer or a protected tree can slow a scheme down or stop it altogether.
  • Surveys and drawings cost money before any decision. On a subject-to-planning sale we normally fund them; on a build you do.
  • A shorter garden changes how your own house feels to live in and may affect what it is worth.

Questions about garden plots in Treharris

Who decides planning for a home in a Treharris back garden?

Merthyr Tydfil County Borough Council decides, using the council’s Local Development Plan (LDP), national policy and any local design guidance. It consults neighbours and other bodies before reaching a decision. We prepare the application and deal with the planning officer, but the outcome is always the council’s call.

How long does planning take for a garden home in Treharris?

It varies. Small schemes often take a few months from submission to decision, and longer if surveys, amendments or extra consultation are needed. Pre-application advice and early surveys add time at the start but can save time later. We won’t promise a date, because the council sets the pace.

Can I build a house in my back garden in Treharris?

Possibly, if the garden is deep enough, has a safe way in and a new home wouldn’t harm the neighbours or the character of the street. A new separate home always needs planning permission, and Merthyr Tydfil County Borough Council makes the decision. A free appraisal will tell you whether your garden is worth taking further.

How do I find out if my Treharris garden is big enough for a house?

Ask for a free garden plot appraisal. We measure depth and the width of the way in, check what lies behind, look at levels, trees and drainage, and compare your garden with your council’s separation and garden-size guidance. Size alone rarely settles it, because access and neighbours’ privacy matter just as much.

Other options in Treharris

Large rear gardens near Treharris

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