Backland Development
0800 088 6248Free to call Free plot appraisal

Build a new home in your garden in Mountain Ash

Our garden design and build service is for Mountain Ash owners who want to keep their land and have a new home built on it, managed from the first appraisal to handover. We cover Mountain Ash and the places around it, and manage every stage for you.

The order of work is clear. Appraisal and survey come first, then design and the planning application, then Building Regulations, the warranty, utility applications and a written quote. Only then does construction start, in stages with inspections, ending with a handover pack you can pass to a buyer, tenant or family member.

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Timber-frame house under construction with scaffolding at the bottom of a back garden, seen from the patio
Planning authority
Rhondda Cynon Taf County Borough Council
Postcodes
CF45
Noon sun, 21 March
About 38°
Shadow from a 5 m eaves line
About 6.3 m
Planning plan
LDP
County
Mid Glamorgan

What shapes a plot in Mountain Ash

Daylight is one of the first things Rhondda Cynon Taf County Borough Council will check on a garden house. At midday on 21 March the sun in Mountain Ash stands roughly 38° above the horizon, so an eaves line about 5 m high casts a shadow of around 6.3 m. On 21 December the sun is only about 15° up and shadows stretch far longer.

That’s why the gap between your house and the new one, and the height of the new roof, are set by measurement rather than guesswork. A lower eaves line, a hipped roof or a single-storey section can make a real difference to the gardens either side.

Section showing noon sun and shadows in Mountain Ash: 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 Mountain Ash 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.

How we’d take it forward in Mountain Ash

From appraisal to a decision from Rhondda Cynon Taf County Borough Council, each step in Mountain Ash is agreed before it starts. After the site visit we quote for survey and design; after design we prepare the application; after permission we deal with conditions and technical approvals and give you a written build quote. Each stage is a separate decision for you, with its cost set out first.

  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

  • A build next door means months of noise, deliveries and contractors near your home; good planning reduces the disruption but doesn’t remove it.
  • Building and selling a new home can change your tax position compared with selling only your house; take advice from a tax adviser first.
  • You fund the build and carry the cost risk; ground conditions, sewer diversions or supply upgrades found later can move the price.

Questions about garden plots in Mountain Ash

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

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 Rhondda Cynon Taf 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.

Who decides planning for a garden house in Mountain Ash?

Rhondda Cynon Taf County Borough Council decides applications for addresses in Mountain Ash, using the council’s Local Development Plan (LDP), national policy and its own design guidance. Neighbours and consultees such as highways officers can comment, and the decision is made by the council’s planning officers or, where the rules allow, its planning committee. Pre-application advice from the council can help test a scheme before the formal application is submitted.

How long does planning take for a new home in a Mountain Ash garden?

The statutory period for deciding a minor application, such as a single new home, is 8 weeks from the date the council receives a valid application, in both England and Wales. In practice many applications take longer, and the council may ask you to agree an extension in writing. Surveys and design before submission add time, and conditions may need approving afterwards.

Do new homes in Mountain Ash need a structural warranty?

If the house will ever be sold or mortgaged, in practice yes. Mortgage lenders usually expect a 10-year structural warranty on a new home, though some accept an architect’s or surveyor’s certificate, and a warranty provider inspects the work at stages during the build, so it has to be in place before construction starts. Building control approval is separate and also required; a buyer’s solicitor will ask for both.

Other options in Mountain Ash

Build in your garden near Mountain Ash

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

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