25 Best Builders in Watford for 2026

🏗️ 25 businesses · 📍 Watford
✓ Reviewed regularly · ✓ Updated 5 October 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 5 October 2026
Watford's housing stock shapes almost every builders' job in the town. There are rows of interwar semis in Cassiobury, Callowland and North Watford that are crying out for rear extensions and loft conversions, plus Victorian terraces around Vicarage Road and the High Street end where solid brick walls, tired chimney breasts and damp problems turn up regularly. Further out, Oxhey, Garston and Bushey have plenty of 1930s and post-war family homes where side returns, garage conversions and wraparound extensions are the usual projects. The clay soil across much of the area also matters. It shrinks and swells with the seasons, so foundation depth and drainage need proper thought, especially near mature trees.

We built this page from third-party business listings, ranking each builder by public review rating and review count, with a small lift for those showing a working website and phone number. We then read each business's homepage to confirm builders work is what they primarily offer, which keeps unrelated businesses off the page. Permanently closed listings are removed automatically. Where you see a Trust Verified badge, that business has additionally passed our full verification covering trade qualifications and accreditations, public liability insurance, trading history, customer review history, and registered company information. Our How We Verify page has the full list. If a business doesn't carry the badge, we haven't independently verified it, so the checks below are ones you should do yourself before booking.

Start by asking for two or three written quotes, itemised so you can compare like with like. Ask to see proof of public liability insurance, and check the cover level suits the size of the job. For extensions and loft conversions, find out who's handling Building Regulations sign-off and whether a party wall notice is needed if you share a wall with a neighbour. Ask for recent references and, where you can, visit a finished job. Agree a payment schedule tied to stages of work, not big sums up front, and get the start date and expected duration in writing. A builder who's booked solid for weeks isn't a red flag. One who can start tomorrow without explanation might be.
How We Select & Rate The Best Builders in Watford

Businesses are ranked by public review rating and review count drawn from third-party business listings, with a small lift for those that show a working website and phone number. We read each business's homepage to confirm builders work is what they primarily offer. Permanently closed listings are removed automatically. Businesses marked Trust Verified have additionally passed our full verification covering qualifications, insurance, trading history, customer review history and registered company information, and our How We Verify page lists every check. Other businesses on this page have not been independently verified by us, and inclusion is not an endorsement. Always do your own checks before hiring.

Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →

Quick Comparison: Builders in Watford

# Business Rating Reviews Phone
1 Build M ⭐ 4.9 176 01923 624053 View →
2 Alex Deco Design Limited ⭐ 5.0 66 020 3633 3929 View →
3 Chris Renovation Ltd ⭐ 5.0 51 07763 758275 View →
4 Build Plus UK ⭐ 5.0 46 07950 908728 View →
5 TIME Construct ⭐ 5.0 41 020 8054 3332 View →
6 Project Squared Construction Ltd ⭐ 5.0 29 07791 182009 View →
7 Primrose Projects ⭐ 5.0 29 01923 617679 View →
8 Watford Drylining&Interiors LTD ⭐ 5.0 27 07909 464771 View →
9 A&D Brickwork Ltd ⭐ 5.0 20 07904 182970 View →
10 ANI Groundworks & Basement Contractors ⭐ 5.0 18 07418 352655 View →
11 Design & Build Builders Ltd ⭐ 4.7 30 07961 528371 View →
12 Flo and Coral Ltd ⭐ 5.0 17 07442 271300 View →
13 J GIBBS BUILDING SERVICES LTD. ⭐ 5.0 16 07467 451716 View →
14 Bimar Properties Ltd ⭐ 4.9 14 07456 870497 View →
15 Goian Group Ltd ⭐ 5.0 11 07928 734432 View →
16 Bowden Builders ⭐ 5.0 11 07803 875447 View →
17 V.P Stairs - Luxury Staircases ⭐ 4.8 13 07418 315550 View →
18 D.R.S GENERAL BUILDER ⭐ 5.0 8 07741 841150 View →
19 Aj dynamic construction ⭐ 5.0 8 07438 171718 View →
20 Millsaw Carpentry and Construction Ltd ⭐ 5.0 7 07985 534646 View →
21 MJR Construction Ltd ⭐ 5.0 6 07393 771898 View →
22 Synergy Eco Ltd ⭐ 4.6 11 01923 591412 View →
23 JANUS CONSTRUCTION LTD ⭐ 5.0 4 07521 531703 View →
24 P.Joseph Design and Build Limited ⭐ 5.0 4 07857 968928 View →
25 The Austin Company of UK Ltd ⭐ 5.0 6 – View →

Our Top Picks

1
Build M
Not Verified
★★★★★ 4.9 (176 reviews)
Watford 01923 624053

Groundworks, extensions, and refurbishments are among the core services offered by Build M, a building firm operating across Watford and the surrounding area. The company also covers commercial and residential maintenance alongside general repairs. Rated 4.9 from 176 Google reviews, it has built a consistent record across a broad range of construction work.

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2
Alex Deco Design Limited
Not Verified
★★★★★ 5.0 (66 reviews)
Watford 020 3633 3929

Watford households looking to update a kitchen can call on Alex Deco Design Limited for fitting work, from cabinetry installation to worktops and finishing touches. The company has built a strong local reputation, reflected in a 5-star average across 66 Google reviews. Based in the WD25 area, it works directly with clients on the practical side of a kitchen renovation.

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3
Chris Renovation Ltd
Not Verified
★★★★★ 5.0 (51 reviews)
Watford 07763 758275

A perfect five-star average across 51 reviews sets Chris Renovation Ltd apart among Watford builders. The firm handles general renovation and building work for households across the town, with the consistency of its feedback suggesting steady, repeat custom rather than one-off jobs. Further details are available via its website.

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4
Build Plus UK
Not Verified
★★★★★ 5.0 (46 reviews)
Watford 07950 908728

Families across Watford extending or renovating their homes make up much of Build Plus UK's workload, from loft conversions to full refurbishments. The firm has built a strong local reputation, reflected in a five-star rating from 46 reviews. Based in the WD24 area, it takes on projects of varying scale for local households.

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5
TIME Construct
Not Verified
★★★★★ 5.0 (41 reviews)
Watford 020 8054 3332

Extensions, loft conversions and refurbishments on older Watford properties make up much of TIME Construct's workload, alongside renovation projects on flats and family homes that need structural or layout changes. The firm's approach suits jobs requiring coordination across trades rather than quick fixes. Its 5-star rating from 41 reviews reflects consistency across these larger, multi-stage builds.

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6
Project Squared Construction Ltd
Not Verified
★★★★★ 5.0 (29 reviews)
Watford 07791 182009

Project Squared Construction Ltd covers a range of building work for residential and commercial clients in Watford and the surrounding area. The company operates under a structured project management approach, keeping builds organised from initial groundwork through to final finishes. Based in WD23, it serves clients across Hertfordshire and into north-west London.

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7
Primrose Projects
Not Verified
★★★★★ 5.0 (29 reviews)
Watford 01923 617679

Watford and the surrounding WD postcodes are served by Primrose Projects, a building firm handling extensions, renovations and general construction work. A perfect five-star rating from 29 reviews points to consistent client satisfaction across its completed jobs. Further details on past projects are available via the company website.

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8
Watford Drylining&Interiors LTD
Not Verified
★★★★★ 5.0 (27 reviews)
Watford 07909 464771

Families in and around Watford needing internal walls, ceilings or partitions finished to a decent standard tend to call on Watford Drylining & Interiors LTD. The firm handles drylining, plastering and related interior work, building a reputation reflected in a 5-star average across 27 reviews. Local households value the tidy finish and clear communication throughout each job.

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9
A&D Brickwork Ltd
Not Verified
★★★★★ 5.0 (20 reviews)
Watford 07904 182970

A&D Brickwork Ltd works as a building and brickwork contractor in Watford, covering extensions, repointing and general masonry repairs. The firm has built up a five-star record from 20 reviews, reflecting consistency across smaller repair jobs as well as larger structural work. Clients are typically local homeowners needing brickwork matched to existing property styles.

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10
ANI Groundworks & Basement Contractors
Not Verified
★★★★★ 5.0 (18 reviews)
Watford 07418 352655

ANI Groundworks & Basement Contractors describes its work in precise terms: groundworks and basement construction in Watford. The scope covers the below-ground and structural elements that precede or underpin a building project, from excavation through to finished basement spaces. Rated five stars across 18 Google reviews, the firm operates under the WD17 postcode area.

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11
Design & Build Builders Ltd
Not Verified
★★★★★ 4.7 (30 reviews)
Watford 07961 528371

House extensions, refurbishment work, and general repairs are the core offer from Design & Build Builders Ltd, operating out of Watford. The company also takes on new home building projects. Rated 4.7 on Google from 30 reviews, it carries a solid local reputation across a range of residential construction work.

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12
Flo and Coral Ltd
Not Verified
★★★★★ 5.0 (17 reviews)
Watford 07442 271300

Flo and Coral Ltd is a Watford-based building firm covering house renovations, kitchen and bathroom remodelling, and plumbing work under one roof. The breadth of trades it handles in-house sets it apart from contractors who subcontract the wet-room and pipework elements. Seventeen Google reviews have returned a five-star rating.

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13
J GIBBS BUILDING SERVICES LTD.
Not Verified
★★★★★ 5.0 (16 reviews)
Watford 07467 451716

Renovations, extensions, and new-build work form the core of what J Gibbs Building Services Ltd offers across Watford and the surrounding area. The company also covers roofing, landscaping, and kitchen and bathroom remodelling, making it a broad-scope contractor for both residential and structural projects. A Google rating of 5.0 from 16 reviews reflects consistent satisfaction among those who have used the firm.

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14
Bimar Properties Ltd
Not Verified
★★★★★ 4.9 (14 reviews)
Watford 07456 870497

Rear extensions, loft conversions, and full-house refurbishments form the core of Bimar Properties Ltd's work across Watford and the surrounding area. The company also carries out kitchen and bathroom renovations, structural alterations, brickwork, and garden landscaping. Rated 4.9 on Google from 14 reviews, it covers a broad range of residential building work under one contractor.

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15
Goian Group Ltd
Not Verified
★★★★★ 5.0 (11 reviews)
Watford 07928 734432

Much of Goian Group Ltd's work in Watford involves extensions and renovations on older houses, where existing structures dictate how new work must be planned. This has built a working knowledge of period quirks alongside standard building tasks. All 11 reviews left for the firm rate it five stars.

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16
Bowden Builders
Not Verified
★★★★★ 5.0 (11 reviews)
Watford 07803 875447

Loft conversions and rear extensions make up the bulk of Bowden Builders' work in Watford, with clients often citing clear communication through the planning and build stages. The WD24 5NW firm has built a solid local record, reflected in a 5 rating across 11 Google reviews.

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17
V.P Stairs - Luxury Staircases
Not Verified
★★★★★ 4.8 (13 reviews)
Watford 07418 315550

A 4.8 rating from 13 reviews points to consistent workmanship at V.P Stairs, a Watford builder specialising in staircase construction and installation. The firm handles bespoke joinery projects, working to individual layouts and finishes rather than standard templates. Enquiries typically cover new builds, renovations, and staircase replacements across the local area.

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18
D.R.S GENERAL BUILDER
Not Verified
★★★★★ 5.0 (8 reviews)
Watford 07741 841150

A perfect 5-star rating from eight reviews sets D.R.S General Builder apart among Watford's building firms, though the review count remains modest. The company handles general building work across the town, covering the sort of jobs that keep a household running smoothly. Further details on specific services are available via its website.

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19
Aj dynamic construction
Not Verified
★★★★★ 5.0 (8 reviews)
Watford 07438 171718

Loft conversions and house extensions form the core of AJ Dynamic Construction's work in Watford, covering structural alterations through to finishing trades. The firm holds a full five-star record from eight reviews, reflecting consistency on projects that often run for weeks rather than days. Enquiries typically start with a site visit to assess scope before any quote is drawn up.

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20
Millsaw Carpentry and Construction Ltd
Not Verified
★★★★★ 5.0 (7 reviews)
Watford 07985 534646

Millsaw Carpentry and Construction Ltd operates in Watford across a broad range of structural and conversion work, including new builds, extensions, loft and garage conversions, and garden rooms. The company also produces concrete worktops, a detail that reflects its roots in carpentry and material craft alongside general construction. Seven Google reviews return a five-star rating.

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21
MJR Construction Ltd
Not Verified
★★★★★ 5.0 (6 reviews)
Watford 07393 771898

General building work across Watford and the surrounding area is the focus of MJR Construction Ltd, a contractor covering residential and commercial projects. The company operates under the WD23 postcode and its wider locality, taking on work that ranges from structural alterations to new builds. Full details of its services are available at mjrconstruction.co.uk.

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22
Synergy Eco Ltd
Not Verified
★★★★★ 4.6 (11 reviews)
Watford 01923 591412

Older properties around Watford make up much of Synergy Eco Ltd's workload, from period houses needing structural repairs to extensions that must tie into existing brickwork. The firm's approach favours energy-conscious upgrades alongside general building work, reflected in a 4.6 rating from 11 reviews. Based in WD24, jobs typically run across the wider Watford area.

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23
JANUS CONSTRUCTION LTD
Not Verified
★★★★★ 5.0 (4 reviews)
Watford 07521 531703

General building work in Watford covers extensions, renovations and structural alterations for domestic and small commercial projects. Janus Construction Ltd manages jobs from initial groundwork through to finishing trades, coordinating each stage under one point of contact. Enquiries are handled directly through the company's website.

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24
P.Joseph Design and Build Limited
Not Verified
★★★★★ 5.0 (4 reviews)
Watford 07857 968928

Building and construction services across Watford and the surrounding area, P.Joseph Design and Build Limited takes on projects from initial design through to finished construction. The company operates across residential and commercial work, offering clients a single point of contact throughout the build process. Its combined design and build model suits homeowners and developers looking to manage a project under one contractor.

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25
The Austin Company of UK Ltd
Not Verified
★★★★★ 5.0 (6 reviews)
Watford

Watford's building projects fall within reach of The Austin Company of UK Ltd, a firm operating from the WD18 area. Their work spans general construction and building services for local clients, with a five-star record built from six reviews suggesting consistent satisfaction on completed jobs.

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Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →

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Frequently Asked Questions

How much does a builders cost in Watford?
It depends heavily on the job. A single-storey rear extension typically runs from about £1,800 to £2,800 per square metre, so a 20 square metre kitchen extension might land between £36,000 and £56,000 including finishes. A dormer loft conversion on a typical semi usually costs £40,000 to £70,000. Smaller jobs such as knocking through a wall with a steel beam tend to be £2,500 to £6,000, while day-rate bricklayers and general builders charge roughly £180 to £280 a day. Spec, access, structural complexity and whether you're using an architect all move the figure. Getting two or three quotes is normal, and you should expect them to vary.
Do I need planning permission for an extension in Watford?
Often not. Many rear extensions and loft conversions fall under permitted development, but there are limits on depth, height and materials, and they don't apply in the same way to flats, maisonettes or properties in conservation areas. Parts of Watford, including areas around Cassiobury Park, have additional constraints. Check with Watford Borough Council, or apply for a lawful development certificate if you want written confirmation. Separate from planning, you'll almost certainly need Building Regulations approval for structural work, so ask your builder who's handling it.
What is a party wall agreement and will I need one?
If your work involves building on or near a shared boundary, cutting into a party wall, or digging foundations within a few metres of a neighbour's property, the Party Wall etc. Act 1996 usually applies. You serve notice on your neighbours, and if they agree, you can proceed. If they dissent, surveyors get involved. This matters in Watford's many terraces and semis. It's the building owner's responsibility, not the builder's, though a good builder will flag it early.
How long does a typical extension or loft conversion take?
A single-storey rear extension usually takes 10 to 16 weeks from groundworks to finishing, assuming no surprises. A dormer loft conversion is often 6 to 10 weeks. Weather, material lead times for bifold doors or steel, and late design changes are the usual causes of delay. Ask for a written programme with milestones, and be wary of anyone promising unrealistically short timescales.
Should I pay a deposit to a builder?
Keep it small. A modest deposit to cover initial materials is common, but large up-front payments leave you exposed if the job stalls. A better arrangement is staged payments tied to completed work, such as foundations, wall plate, roof watertight, first fix and completion. Put the schedule in the contract, and hold back a final payment until snagging is done.
How do I check a builder before hiring them?
Ask for proof of public liability insurance and check the cover amount and expiry. See whether they hold relevant trade accreditation and confirm it with the scheme directly. Look at Google reviews for patterns, not just the star rating, and read how they respond to complaints. Ask for two or three recent references and, ideally, visit a completed job. Search the company name on Companies House if they trade as a limited company. Get everything in writing: scope, price, payment stages, start date and who deals with Building Control. Remember, businesses without a Trust Verified badge haven't been independently checked by us, so this legwork is yours.