Backland Development
0800 088 6248Free to call Free plot appraisal

Build a new home in your garden in Treharris

For a garden in Treharris to take a new house, three things have to line up: a safe way in, enough space to keep both homes private and light, and services that can reach the plot at sensible cost. Our free appraisal looks at all three before you spend anything.

If they line up, we move on to a measured survey, design and, where useful, pre-application advice from Merthyr Tydfil County Borough Council. Planning permission is the council’s decision, so the design is shaped around the tests its officers apply rather than the largest house the plot could possibly hold.

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Timber-frame house under construction with scaffolding at the bottom of a back garden, seen from the patio
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

We cover gardens in Treharris and nearby places such as Nelson, Gelligaer and Mountain Ash, with the same process wherever you are: a free desktop appraisal, a visit if the plot looks viable, then survey and design.

Some of those places may fall under a different council from Merthyr Tydfil County Borough Council, and each local planning authority has its own design guidance, validation list and pre-application service. We confirm which authority covers your address at the start, so the application is prepared for the right requirements first time and avoids delays at validation.

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
Noon sun in Treharris on 21 March sits about 38° above the horizon, so a typical two-storey eaves line (about 5 m) throws a shadow of roughly 6.3 m. In December the sun is only about 15° up and shadows stretch much further. Drawn for a garden facing north, where it matters most.

What happens next in Treharris

If your Treharris plot already has planning permission, we begin by checking the approved drawings and conditions against the site. Some permissions need detailed design, discharge of conditions or a minor amendment before they can be built. We then prepare the technical drawings, arrange Building Regulations approval and the warranty, apply for utility connections and give you a written quote to build.

  1. Free plot appraisal

    We check the title plan, access, constraints and planning policy from our desk, talk the plot through with you, and visit if it looks viable. There’s no cost and no obligation.

  2. Planning and approvals

    We submit the planning application and manage it to a decision, then deal with conditions, Building Regulations approval, the structural warranty, any build-over agreement and the new utility connections.

  3. Written quote and build

    Once design and survey are complete you get a written quote. The build runs in stages — access and groundworks, foundations, frame and roof, fit-out and external works — with inspections at each key point.

  4. Handover

    You receive the completion certificate, warranty documents, Energy Performance Certificate, manuals and utility details, so the new home is ready to move into, let or put on the market.

Worth checking early

  • Building and selling a new home can change your tax position compared with selling only your house; take advice from a tax adviser first.
  • Your own garden gets smaller and the new home will be visible from your house, so screening and separation matter for both homes.
  • Planning can be refused, and money spent on surveys, design and the application isn’t recovered if it is — which is why we start with an appraisal.

Treharris: questions to ask

Will I pay Community Infrastructure Levy on a new home in Treharris?

Only if Merthyr Tydfil County Borough Council has adopted a Community Infrastructure Levy charging schedule; not every council has. Where it applies, it can be charged on a new home of any size. A self-build exemption exists for people building a home to live in, but it must be claimed before work starts, so we check the position at design stage.

Do you visit gardens in Treharris before giving advice?

We start with a desk review of the title plan, access, constraints and planning policy, then talk the plot through with you. If it looks viable, we arrange a site visit to see the access, levels, trees and neighbouring windows for ourselves. The appraisal is free and carries no obligation.

Can I build a house in my garden in Treharris and keep the land?

Yes. On our design and build route you remain the owner while we design the home, apply to Merthyr Tydfil County Borough Council for planning, deal with Building Regulations and build it. The finished house can be sold, let or kept for family. Whether your plot can take a house depends on access, space, neighbours and local policy, and the decision rests with the council.

How close can a new house be to my own in Treharris?

There’s no single national distance. Many councils use separation guides of around 21 metres between facing back windows and around 12 to 15 metres between a back window and a blank side wall, but the guidance used by Merthyr Tydfil County Borough Council decides. Window positions, ground levels, roof shape and screening all affect what is acceptable, which is why we survey before we design.

Other options in Treharris

Build in your garden 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.

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