Wales regional pricing

How Much Does a Builder Cost in Merthyr Tydfil?

Updated prices for . Merthyr Tydfil prices are typically 9% below the national average.

14 services priced
Wales region
Updated

Price summary

Merthyr Tydfil Price Summary

Service Low Average High
Single Storey Extension £27,330 £45,550 £72,880
Double Storey Extension £45,550 £77,435 £127,540
Loft Conversion £22,775 £40,995 £68,325

Prices include labour and materials. VAT may apply. Based on Wales regional pricing.

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Full pricing

All Builder Prices in Merthyr Tydfil

Every price adjusted for Merthyr Tydfil using a 0.911x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£27,330

Average

£45,550

High

£72,880

8-12 weeks

Double Storey Extension

Low

£45,550

Average

£77,435

High

£127,540

12-20 weeks

Loft Conversion

Low

£22,775

Average

£40,995

High

£68,325

6-10 weeks

Garage Conversion

Low

£7,290

Average

£13,665

High

£22,775

2-4 weeks

Porch Build

Low

£2,280

Average

£4,100

High

£7,290

1-2 weeks

Garden Wall

Low

£730

Average

£1,365

High

£2,735

2-4 days

Knock Through Internal Wall

Low

£910

Average

£1,640

High

£3,190

2-4 days

Chimney Breast Removal

Low

£1,095

Average

£1,820

High

£3,190

2-4 days

Underpinning

Low

£4,555

Average

£10,930

High

£22,775

2-4 weeks

Damp Proof Course

Low

£455

Average

£1,095

High

£2,280

1-3 days

New Build Garage

Low

£9,110

Average

£16,400

High

£27,330

3-5 weeks

Outbuilding or Garden Room

Low

£10,930

Average

£22,775

High

£45,550

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£910

Average

£1,640

High

£2,735

1-2 days

Patio or Decking Build

Low

£1,365

Average

£3,190

High

£6,375

3-5 days

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Regional comparison

How Merthyr Tydfil Compares

Average cost of single storey extension across regions.

Merthyr Tydfil
-9% £45,550
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Merthyr Tydfil?

Wales has a distinctive mix of housing, from Victorian and Edwardian terraces in the south to stone-built cottages and rural properties across the rest of the country. Merthyr Tydfil and the wider area around Swansea and the Valleys include many older properties that present challenges for builder work. Stone walls, exposed locations, and older infrastructure all tend to push costs toward the higher end.

Wales sits below the national average for trade costs. Labour rates in Merthyr Tydfil are typically 9% below the UK average. While this makes builder work more affordable, there can be fewer qualified professionals in rural areas compared to English cities, which can mean longer waiting times. In more populated areas, competition keeps prices reasonable. Always get at least three quotes.

Properties in Merthyr Tydfil can present specific challenges that affect builder costs. Stone-built and older Welsh terraces often have thick walls that make work more difficult and expensive. Properties in exposed or rural locations may face harsher weather conditions that influence timing and approach. For larger jobs in Merthyr Tydfil, expect to pay £45,550 to £127,540 for double storey extension.

When getting quotes in Merthyr Tydfil, aim for at least three from different qualified professionals. Ask each one to visit and assess the work rather than quoting over the phone. A good builder will check existing conditions, identify complications, and provide a detailed cost breakdown. Be wary of quotes that seem significantly cheaper — they may be cutting corners on materials or quality. Always check qualifications, insurance and recent reviews.

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More services

Other Services in Merthyr Tydfil

Explore costs for other services in the Merthyr Tydfil area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Merthyr Tydfil.

How much does a builder cost in Merthyr Tydfil in 2026?
Single Storey Extension in Merthyr Tydfil typically costs between £27,330 and £72,880, with the average being around £45,550. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Merthyr Tydfil than London?
Yes. Merthyr Tydfil builder costs are typically 9% below the national average, while London prices run around 24% above it. For single storey extension, you could save over £16,600 compared to the same job in London.
How do I find a good builder in Merthyr Tydfil?
Get at least three quotes from different tradespeople, check recent reviews, and ask whether the quote includes VAT and everything you need. A detailed written quote that breaks down all costs is a good sign. Always check qualifications, insurance and recent reviews before hiring.
What affects builder prices in Merthyr Tydfil?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Merthyr Tydfil rates are 9% below the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Merthyr Tydfil?
The prices shown on this page include all typical costs. However, when getting real quotes, always confirm what is and isn't included. Some tradespeople break out costs separately, while others give an all-in price. Ask for a detailed breakdown before agreeing to any work.