17 Best Builders in Northampton for 2026

🏗️ 17 businesses · 📍 Northampton
✓ Reviewed regularly · ✓ Updated 5 October 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 5 October 2026
Northampton's housing stock gives builders plenty to work with. There are Victorian terraces around Semilong, Abington and the Mounts, interwar semis in Kingsthorpe and Duston, and big estates of 1960s and 70s brick houses in Weston Favell and Kings Heath. Newer builds in Upton and Overstone Leys bring a different set of jobs, mostly garage conversions, porches and garden rooms. Soil matters here too. Much of the town sits on clay and Northamptonshire sand and ironstone, so foundation depth and drainage get real attention on extensions, 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. We then read every homepage to confirm that builders work is what the business primarily offers, which keeps unrelated trades off the page. Listings flagged as permanently closed are removed automatically. Where you see a Trust Verified badge, that business has also 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. Builders without the badge haven't been independently verified by us, so those checks are yours to make before you book.

Get two or three written quotes, and make sure each one breaks the job down line by line so you can compare like with like. Ask for proof of public liability insurance, and check whether they're a member of the Federation of Master Builders or hold other relevant trade accreditation. For extensions and loft conversions, ask who's handling Building Regulations sign-off with West Northamptonshire Council and whether a Party Wall Agreement is needed with your neighbours. Agree a payment schedule tied to stages of work, never a big upfront sum. Ask for the final completion certificate and any guarantees in writing, and keep them somewhere safe for when you sell.
How We Select & Rate The Best Builders in Northampton

Businesses are ranked by public review rating and review count drawn from third-party business listings, with a small lift for those showing a working website and phone. We read each business's homepage to confirm that builders work is what they primarily offer. Listings flagged as permanently closed are removed automatically. Businesses marked Trust Verified have additionally passed our full verification covering trade qualifications, public liability insurance, trading history, customer review history and registered company information. 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 Northampton

Our Top Picks

1
Swiss Build
Not Verified
★★★★★ 4.9 (49 reviews)
Northampton 01604 288123

Swiss Build operates as a construction company serving Northampton and surrounding areas from their base on Stafford Place. The builders have earned a strong reputation with customers, achieving a 4.9 out of 5 star rating based on 49 verified Google reviews. Their established presence in the NN3 area positions them to handle various building projects for local residential and commercial clients.

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2
AAS Group Construction Ltd
Not Verified
★★★★★ 5.0 (17 reviews)
Northampton 07777 792227

AAS Group Construction Ltd provides building services from their Abington Street base in Northampton, serving the local area with a range of construction projects. The company has earned a perfect 5-star rating from 17 verified customer reviews, reflecting their commitment to quality workmanship and customer satisfaction.

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3
Shoor Construction
Not Verified
★★★★★ 5.0 (14 reviews)
Northampton 01604 385287

Shoor Construction provides building services to clients in Northampton from their Leicester Street base. The company has earned a perfect 5-star rating from 14 verified customer reviews on Google. They serve the local area from their NN1 postcode location, offering reliable construction solutions for residential and commercial projects.

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4
Smart Build Services and Development Ltd
Not Verified
★★★★★ 5.0 (13 reviews)
Northampton 01604 622608

Smart Build Services and Development Ltd provides building services to Northampton and surrounding areas from their Weston Favell base. The company has earned a perfect 5-star rating from 13 verified customer reviews on Google. They serve the NN3 postcode area and wider Northamptonshire region for various construction projects.

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5
Sasbort LTD
Not Verified
★★★★★ 4.9 (14 reviews)
Northampton 07490 430957

Sasbort LTD provides professional building services to clients across Northampton and the surrounding areas from their base on Ringway. The company has earned a strong reputation for quality workmanship, reflected in their impressive 4.9 out of 5 star rating from 14 verified customer reviews on Google.

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6
S&R Northants
Not Verified
★★★★★ 4.8 (16 reviews)
Northampton 01604 439480

S&R Northants provides building services to customers in Northampton and the surrounding areas. Operating from Charter Gate in the NN3 postcode area, the company has earned a strong reputation with a 4.8 out of 5 star rating based on 16 verified customer reviews. Their experienced team handles various construction and building projects for residential and commercial clients throughout Northamptonshire.

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7
Pi Building Services Ltd
Not Verified
★★★★★ 5.0 (11 reviews)
Northampton 07869 282052

Pi Building Services Ltd operates from Moulton Park in Northampton, providing professional building services to clients across the NN3 area and surrounding neighbourhoods. The company has earned a perfect 5-star rating from 11 verified customer reviews on Google, reflecting their commitment to quality workmanship and customer satisfaction.

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8
Keystone Group - All Trades One Place
Not Verified
★★★★★ 5.0 (11 reviews)
Northampton 01604 969509

Keystone Group - All Trades One Place provides comprehensive building services from their base on Kingsfield Way in Northampton. The company offers a wide range of construction and maintenance services under one roof, serving the NN5 area and surrounding neighbourhoods. With a perfect 5-star rating from 11 verified customer reviews, they have established a strong reputation for reliable workmanship across multiple trades.

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9
Boyson Construction
Not Verified
★★★★★ 4.7 (15 reviews)
Northampton 07779 026403

Boyson Construction provides building services to clients across Northampton from their base on Harvey Reeves Road. The company has earned a 4.7-star rating from 15 verified customer reviews, reflecting their commitment to quality construction work in the NN5 area and surrounding districts.

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10
Abbex Building Solutions Limited
Not Verified
★★★★★ 5.0 (7 reviews)
Northampton 01604 743569

Building work across Northampton and the surrounding villages is the focus of Abbex Building Solutions Limited, a builder operating from the NN6 area. The company takes on general construction and renovation projects for domestic customers. Its Google rating stands at 5 from 7 reviews, a small but consistent sample of customer feedback.

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11
Raybell and Sons Surfacing Ltd
Not Verified
★★★★☆ 4.2 (19 reviews)
Northampton 01604 211111

Raybell and Sons Surfacing Ltd provides building services from their base on Lower Farm Road in Northampton, serving the NN3 area and surrounding districts. The company maintains a 4.2 out of 5 star rating based on 19 verified customer reviews. Their established reputation and local presence make them a reliable choice for construction and surfacing projects throughout Northampton.

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12
S & E Construction Group
Not Verified
★★★★★ 4.6 (10 reviews)
Northampton 07413 939000

S & E Construction Group provides building services to customers in Northampton and the surrounding areas from their base in the NN3 postcode. The company has earned a solid reputation with a 4.6 out of 5 star rating from 10 verified customer reviews on Google. Their experienced team handles various construction projects for residential and commercial clients throughout the local area.

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13
Total B Construction
Not Verified
★★★★★ 5.0 (5 reviews)
Northampton 01604 389079

Total B Construction provides building services to clients across Northampton from their base on Abington Street. The company has earned a perfect 5-star rating from 5 verified customer reviews, reflecting their commitment to quality workmanship and customer satisfaction.

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14
Northbrick
Not Verified
★★★★★ 5.0 (4 reviews)
Northampton 07400 086639

Northbrick provides building services to customers in Northampton and surrounding areas from their base on Ellesmere Avenue. The company has earned a 5-star rating from 4 verified customer reviews on Google. Their website offers additional information about their construction and building work throughout the NN5 area.

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15
Hewlett & Sons Groundworks Ltd
Not Verified
★★★★☆ 4.3 (8 reviews)
Northampton 01604 714333

Hewlett & Sons Groundworks Ltd provides building and groundworks services from their base on Bunting Road in Northampton. The family-run company serves the NN2 area and surrounding neighbourhoods with construction expertise. With a Google rating of 4.3 out of 5 stars from 8 verified customer reviews, they have established a solid reputation for their building work.

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16
M Home Renovations LTD
Not Verified
★★★★☆ 4.2 (5 reviews)
Northampton 07411 155422

M Home Renovations LTD provides building services from their base on Lindsay Avenue in Northampton, serving the NN3 area and surrounding neighbourhoods. The company has earned a 4.3 out of 5 star rating from 6 verified customer reviews on Google. They maintain an online presence at mhomerenovations.com for potential clients seeking renovation and construction work.

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17
International Construction Group
Not Verified
★★★★☆ 4.0 (4 reviews)
Northampton 07553 541590

International Construction Group provides building services to clients in Northampton and the surrounding areas. The company has earned a 4-star rating from 4 verified customer reviews on Google. Their team handles various construction projects for residential and commercial properties throughout the local region.

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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 Northampton?
It depends on the job. A single-storey rear extension typically runs from about £1,800 to £2,500 per square metre, so a 20 square metre kitchen extension lands somewhere between £36,000 and £50,000 before fit-out. A loft conversion with dormer usually costs £40,000 to £65,000. Smaller jobs like knocking through a wall with a steel beam tend to be £2,500 to £6,000. Day rates for a general builder are often £200 to £300. Spec, access and ground conditions drive the variation, and clay soils can push foundation costs up. Getting two or three quotes is normal, and any decent builder expects it.
Do I need planning permission for an extension in Northampton?
Often you don't. Many single-storey rear extensions fall under permitted development, but limits apply on depth, height and how close you build to a boundary. Terraced and semi-detached houses have tighter rules, and conservation areas such as parts of the town centre and Abington add restrictions. Loft conversions with a rear dormer are frequently permitted development too. Always check with West Northamptonshire Council or apply for a Lawful Development Certificate, which gives you proof for when you sell. Building Regulations approval is needed either way.
What is a Party Wall Agreement and will I need one?
If you're building on or near a boundary, digging foundations within three metres of a neighbour's property, or cutting into a shared wall, the Party Wall Act applies. That's common on Victorian terraces in Semilong or Kingsthorpe. You serve notice on your neighbours, and if they dissent, surveyors get involved. Expect to pay £700 to £1,500 per neighbour for a surveyor. Your builder should flag this early, and it's worth raising it before you sign a contract.
How long does a typical building project take?
A rear extension usually takes 12 to 16 weeks from breaking ground to handover, plus time for plastering to dry before decorating. A loft conversion is often 6 to 10 weeks. Garage conversions can be done in 3 to 5 weeks. Lead times matter as well. Good builders are often booked two to four months ahead, so a delayed start isn't a red flag by itself. Ask for a written programme with stages, and expect weather and material delays to shift things slightly.
Should I pay a deposit to a builder?
Be cautious. Larger deposits are a common sign of trouble. For bigger projects, a small deposit of 5 to 10 percent is reasonable to secure materials, followed by stage payments agreed in writing, for example after foundations, after the roof is watertight and at completion. Hold back a final payment until snagging is finished. Never pay the full amount upfront, and avoid cash-only deals with no paperwork.
How do I check a builder is reliable before hiring?
Start with proof, not promises. Ask to see public liability insurance and check the cover amount, ideally at least £2 million. Look for membership of the Federation of Master Builders or other relevant trade accreditation, and confirm it with the body directly. Check online reviews for patterns, not just the star rating. Ask for addresses of recent local jobs and, if you can, visit one. Get a written contract that covers scope, price, payment stages and timescales. If a builder is vague or won't put things in writing, move on.