16 Best Builders in Cardiff for 2026

🏗️ 16 businesses · 📍 Cardiff
✓ Verified Google reviews · ✓ Reviewed regularly · ✓ Updated 16 May 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 16 May 2026
Cardiff's building trade serves everything from Victorian terraces in Cathays and Roath to modern developments in Cardiff Bay. The city's mix of period properties means builders here handle everything from damp-proofing century-old stone walls to installing contemporary glass extensions. Local soil conditions around the Taff floodplain affect foundation work, whilst conservation area restrictions in suburbs like Llandaff influence planning requirements.

Every builder featured here has been checked through Google Reviews analysis, active trading verification, and credentials confirmation where applicable. We've looked at consistent review patterns over time rather than just star ratings, checked Companies House records for active status, and verified relevant certifications like Gas Safe registration for heating work.

Before you book anyone, get at least three written quotes that break down materials and labour separately. Check they're properly insured with public liability cover of at least £2 million, and ask to see recent work examples in your area. Don't pay large sums upfront - reputable builders typically ask for small deposits with staged payments as work progresses.
How We Select & Rate The Best Builders in Cardiff

Our selection process examines Google ratings alongside review volume and consistency over time, verifies active trading status through Companies House records, and checks relevant professional certifications where applicable. We prioritise businesses with established local presence and documented customer feedback. This directory provides information only - inclusion doesn't constitute an endorsement, and readers should conduct their own due diligence before hiring any contractor.

Quick Comparison — Builders in Cardiff

# Business Rating Reviews Phone
1 Muscle ,Stone & Brick Solutions Recommended ⭐ 5.0 67 +44 7964 256827 View →
2 Bull & Sons Groundwork and Developments Featured ⭐ 5.0 26 +44 7707 500913 View →
3 MCS Construction & Developments Featured ⭐ 5.0 16 +44 7861 874002 View →
4 REJUVENATE GROUNDWORKS DEVELOPMENT GROUP LIMITED Featured ⭐ 5.0 15 +44 29 2200 2203 View →
5 C James Carpentry and Construction Ltd Featured ⭐ 5.0 14 +44 7817 652364 View →
6 Mark James Building Contractors Ltd ⭐ 4.9 11 +44 7718 688740 View →
7 Sphinx Constructions Ltd ⭐ 4.9 9 +44 7427 488260 View →
8 Reid Building Limited ⭐ 5.0 7 +44 29 2278 0399 View →
9 Ash Installations And Construction ⭐ 4.0 27 +44 7387 373747 View →
10 Camilleri Construction Limited ⭐ 4.4 14 +44 345 375 3312 View →
11 ABN Construction Ltd ⭐ 5.0 5 +44 7453 390655 View →
12 Aldrebeconstruction ⭐ 4.6 11 View →
13 JEP Exstensions & Brickwork ⭐ 5.0 3 +44 7578 759313 View →
14 Dragon Construction Ltd ⭐ 4.2 10 +44 29 2037 1341 View →
15 Atlantic Construction ⭐ 4.2 5 +44 29 2056 2091 View →
16 Knox & Wells Ltd ⭐ 4.0 4 +44 29 2061 3999 View →

Our Top Picks

6
Mark James Building Contractors Ltd
4.9 (11 reviews)

Mark James Building Contractors Ltd provides professional building services throughout Cardiff from their base on Cyncoed Road. The company has earned a 4.9/5 star rating from 11 verified customer reviews, reflecting their reliable approach to construction projects. They serve the CF23 area and surrounding Cardiff neighbourhoods with comprehensive building contractor services.

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7
Sphinx Constructions Ltd
4.9 (9 reviews)

Sphinx Constructions Ltd provides building services throughout Cardiff from their base in Maindy. The company has earned a 4.9/5 star rating based on 9 verified customer reviews. They serve the local area with construction work whilst maintaining their website at sphinxgroup.uk for client information.

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8
Reid Building Limited
5.0 (7 reviews)

Reid Building Limited provides professional building services throughout Cardiff from their base on Aberporth Road. The company has earned a perfect 5-star rating from 7 verified customer reviews, reflecting their commitment to quality workmanship and customer satisfaction. They serve the CF14 area and surrounding Cardiff neighbourhoods with reliable construction and building solutions.

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9
Ash Installations And Construction
4.0 (27 reviews)

Ash Installations And Construction holds a 4.0-star rating on Google from 27 reviews. Based in Cardiff. Contact them for a free, no-obligation quote.

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10
Camilleri Construction Limited
4.4 (14 reviews)

Camilleri Construction Limited provides professional building services throughout Cardiff from their base in CF24. The company has earned a solid reputation with a 4.4-star rating from 14 verified customer reviews. Their experienced team handles various construction projects for residential and commercial clients across the local area.

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11
ABN Construction Ltd
5.0 (5 reviews)

ABN Construction Ltd provides building services from their Cardiff base on Colum Road, serving the CF10 area and surrounding districts. The company has earned a perfect 5-star rating from 5 verified customer reviews, reflecting their commitment to quality workmanship. Their team handles various construction projects for residential and commercial clients throughout Cardiff.

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12
Aldrebeconstruction
4.6 (11 reviews)
Cardiff Website

Aldrebeconstruction provides building services across Cardiff, operating from their base in CF23. With a 4.6/5 star rating from 11 verified customer reviews, they handle construction projects for residential and commercial clients throughout the area.

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13
JEP Exstensions & Brickwork
5.0 (3 reviews)

JEP Extensions & Brickwork provides building services including extensions and brickwork from their Cardiff base, serving the CF11 area and surrounding districts. The company has earned a 5-star rating from 3 verified customer reviews on Google. Their website at jepbrickwork.com offers further details about their construction and masonry services.

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14
Dragon Construction Ltd
4.2 (10 reviews)

Dragon Construction Ltd operates as a building contractor serving Cardiff and the surrounding areas from their base in Canton. The company has earned a 4.2 out of 5 star rating from 10 verified customer reviews on Google. They handle various construction projects for residential and commercial clients throughout the CF11 postcode area and beyond.

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15
Atlantic Construction
4.2 (5 reviews)

Atlantic Construction provides building services across Cardiff from their base on St Fagans Road. The company maintains a 4.2-star rating from 5 verified customer reviews. They serve the CF5 area and surrounding Cardiff neighbourhoods with construction expertise.

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16
Knox & Wells Ltd
4.0 (4 reviews)

Knox & Wells Ltd provides building services across Cardiff from their base in CF14. The company has earned a 4-star rating from 4 verified customer reviews on Google. They operate from Creswell House on Field Way, offering construction and building solutions to clients throughout the local area.

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Transparency notice: Recommended (#1) and Featured (positions 2-5) listings may be paid placements. All other rankings are determined by a combined score drawn from Google ratings, review counts, and reputation signals gathered from multiple independent online sources. How we verify →

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Frequently Asked Questions

How much does a builders cost in Cardiff?
Expect to pay £150-250 per day for general building work, with skilled trades like bricklaying commanding £200-300 daily. Small jobs like repair work start around £80-120 for half-day callouts. Extension work typically runs £1,200-1,800 per square metre depending on specification. Kitchen and bathroom refits range from £8,000-25,000. Always get two or three detailed quotes as prices vary significantly based on materials, access, and complexity.
Do I need planning permission for building work in Cardiff?
Single-storey rear extensions under 6 metres (terraced houses) or 8 metres (detached/semi-detached) usually fall under permitted development rights. However, Cardiff has numerous conservation areas where different rules apply. Properties in Llandaff, parts of Roath, and city centre require planning permission for most external changes. Check Cardiff Council's planning portal or consult your builder - many handle planning applications as part of their service.
How long do typical building projects take in Cardiff?
Bathroom refits take 1-2 weeks, kitchen installations 2-3 weeks, and single-storey extensions 6-12 weeks depending on size. Weather delays are common during Cardiff's wet winter months, particularly for roofing and external work. Factor in extra time for conservation area approvals and Welsh Water connections if you're extending drainage. Most builders book 4-8 weeks ahead during busy spring and summer periods.
What insurance should my builder have?
All builders must carry public liability insurance of at least £2 million - this covers damage to your property and injury to third parties. For structural work, look for contractors with professional indemnity insurance covering design defects. If they're doing electrical or gas work, check their Part P certification or Gas Safe registration respectively. Always ask to see current insurance certificates before work starts.
What's the difference between builders and specialist contractors?
General builders handle structural work, basic plumbing, tiling, and carpentry but subcontract electrical and gas work to certified specialists. Specialist contractors focus on single trades - electricians, plumbers, roofers - and often charge premium rates but offer deeper expertise. For complex projects like full renovations, a main contractor coordinates all trades. For simple repairs, direct specialist hire is usually more cost-effective.
How do I verify a builder's credentials and reputation?
Check Companies House for active trading status and financial health. Look for membership of trade bodies like the Federation of Master Builders or Trustmark scheme. Read Google Reviews focusing on recent detailed feedback rather than just star ratings. Ask for references from jobs completed in the last 12 months and drive past to see the quality. Verify insurance certificates directly with insurers and check Gas Safe registration online if they're doing heating work.