Wales regional pricing

How Much Does a Builder Cost in Monmouthshire?

Updated prices for . Monmouthshire prices are typically 10% above the national average.

14 services priced
Wales region
Updated

Price summary

Monmouthshire Price Summary

Service Low Average High
Single Storey Extension £33,000 £55,000 £88,000
Double Storey Extension £55,000 £93,500 £154,000
Loft Conversion £27,500 £49,500 £82,500

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

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Full pricing

All Builder Prices in Monmouthshire

Every price adjusted for Monmouthshire using a 1.1x cost multiplier, rounded to the nearest £5.

Single Storey Extension

Low

£33,000

Average

£55,000

High

£88,000

8-12 weeks

Double Storey Extension

Low

£55,000

Average

£93,500

High

£154,000

12-20 weeks

Loft Conversion

Low

£27,500

Average

£49,500

High

£82,500

6-10 weeks

Garage Conversion

Low

£8,800

Average

£16,500

High

£27,500

2-4 weeks

Porch Build

Low

£2,750

Average

£4,950

High

£8,800

1-2 weeks

Garden Wall

Low

£880

Average

£1,650

High

£3,300

2-4 days

Knock Through Internal Wall

Low

£1,100

Average

£1,980

High

£3,850

2-4 days

Chimney Breast Removal

Low

£1,320

Average

£2,200

High

£3,850

2-4 days

Underpinning

Low

£5,500

Average

£13,200

High

£27,500

2-4 weeks

Damp Proof Course

Low

£550

Average

£1,320

High

£2,750

1-3 days

New Build Garage

Low

£11,000

Average

£19,800

High

£33,000

3-5 weeks

Outbuilding or Garden Room

Low

£13,200

Average

£27,500

High

£55,000

3-6 weeks

Structural Steelwork (RSJ Installation)

Low

£1,100

Average

£1,980

High

£3,300

1-2 days

Patio or Decking Build

Low

£1,650

Average

£3,850

High

£7,700

3-5 days

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Regional comparison

How Monmouthshire Compares

Average cost of single storey extension across regions.

Monmouthshire
+10% £55,000
National Average
baseline £50,000
London
+24% £62,150

Local insights

What Affects Builder Costs in Monmouthshire?

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. Monmouthshire 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 Monmouthshire are typically 10% above 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 Monmouthshire 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 Monmouthshire, expect to pay £55,000 to £154,000 for double storey extension.

When getting quotes in Monmouthshire, 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 Monmouthshire

Explore costs for other services in the Monmouthshire area.

40 services — scroll to explore

Common questions

Frequently Asked Questions

Common questions about builder costs in Monmouthshire.

How much does a builder cost in Monmouthshire in 2026?
Single Storey Extension in Monmouthshire typically costs between £33,000 and £88,000, with the average being around £55,000. Prices vary depending on the scope of work, materials used, and the specific requirements of your property.
Are builder prices cheaper in Monmouthshire than London?
Monmouthshire prices are 10% above the national average, though still £7,150 cheaper than London for single storey extension.
How do I find a good builder in Monmouthshire?
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 Monmouthshire?
The main factors are the scope and complexity of what you need, the options and products chosen, and local market rates. Monmouthshire rates are 10% above the national average. Getting multiple quotes is the best way to ensure a fair price.
Do builder prices include materials in Monmouthshire?
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.