07915 976616Open 24 hours, 7 days a week AboutServicesBuilding services in St Neots House extensionsHome renovations & knock-throughsStructural work & steel beamsBrickwork & bricklayingRe-pointing & stone slipsPatiosLandscaping & garden redesignFencingFireplace builds & renovationNew build & self-build homes View all building services AreasAreas we cover Builders in St NeotsBuilders in HuntingdonBuilders in St IvesBuilders in GodmanchesterBuilders in CambourneBuilders in CambridgeBuilders in SandyBuilders in Hemingford Grey View all areas covered Our WorkWhole ProjectsReviewsContact07915 976616Request an estimateMenu HomeAreasCambourne # House extensions in Cambourneand estate homes done properlyby a local Cambridgeshire builder Extensions, renovations, structural steels and outdoor work across Great, Lower and Upper Cambourne, working within the tight plots and estate finishes this town is built on. Request an estimate 07915 976616 £2 million insured · 6-month workmanship guarantee · 5.0 from 36 Google reviews 5.0 from 36 reviews 100% recommended on Facebook 10 years in the trade Jack on site daily £2 million insured Public & employers' liability Phone open 24 hours 6-month workmanship guarantee Working in Cambourne ## Building work in Cambourne Cambourne is a young town by Cambridgeshire standards, built out in three linked phases over the last twenty-five years: Great Cambourne, Lower Cambourne and Upper Cambourne. Most of the housing stock is modern estate build, brick and block cavity walls, trussed roofs, standard door and window openings, and plots that were sized tightly to fit as many homes as possible on each street. That combination matters when you're planning work here. Extending a modern semi or terrace in Cambourne is a different job from extending a Victorian house in St Neots: the structural openings are more predictable, but access down the side of the house is often narrower, and boundaries with neighbouring gardens sit close. We see a steady run of rear single-storey extensions and kitchen-diner knock-throughs on the estate homes around Jeavons Lane, Sackville Way and the closes off Broad Street, where families have outgrown the original kitchen layout and want to open the back of the house onto the garden. Because most of these houses were built to a similar handful of house-type designs, we've a good working knowledge of where the load-bearing walls sit before we even open anything up, though every wall still gets checked properly on site rather than assumed. Rear and side extensions, knock-throughs and garden work make up most of what we do in Cambourne. Gardens and outside space across the town were mostly finished to a standard developer spec, and a good number of homeowners are now laying new patios, rebuilding garden walls or having the garden redesigned once the original finish has worn after a decade or more of use. Ground conditions around Cambourne are mixed clay over the underlying Gault clay bed common to this part of Cambridgeshire, which affects how foundations and drainage are set out for anything new, walls, extensions or patios. We work with what's actually in the ground on the day, checked properly, rather than guessing from what's typical two streets over. ### Distance from base Cambourne sits roughly 20 minutes' drive from our St Neots base along the A428, so getting out to look at a job or attend site here is a regular, straightforward run for us. ### Property stock Predominantly modern estate housing built from the late 1990s onwards across Great, Lower and Upper Cambourne, with brick-and-block construction and standard developer finishes throughout. ### Plots and access Plots are generally tighter than in older Cambridgeshire towns, so side access, scaffold clearance and material delivery all get planned for before work starts. ### Ground conditions Clay-based ground typical of this part of Cambridgeshire, which is factored into foundation depth and drainage for extensions, walls and patios. What we do here ## Services we carry out in Cambourne ### House extensions Rear and kitchen-diner extensions on the standard estate house types found across Great and Lower Cambourne, matched to existing brick and roofline. House extensions in Cambourne ### Home renovations & knock-throughs Knock-throughs and full room renovations opening up the compact original layouts common on Cambourne's estate homes. Home renovations & knock-throughs in Cambourne ### Structural work & steel beams Load-bearing wall removal and steel installation for open-plan kitchen-diners, carried out with proper checks on site rather than assumptions from the house type. Structural work & steel beams in Cambourne ### Brickwork & bricklaying Boundary and garden walls built to match developer brick where plots back directly onto neighbours or shared paths. Brickwork & bricklaying in Cambourne ### Re-pointing & stone slips Re-pointing on estate brickwork as original mortar ages, plus stone slip work for homeowners upgrading a feature wall or fireplace. Re-pointing & stone slips in Cambourne ### Patios New patios laid on proper foundations to suit Cambourne's clay ground, replacing worn original paving slabs. Patios in Cambourne ### Fencing Fence line replacement along the close-set boundaries typical of Cambourne's estate gardens. Fencing in Cambourne ### Landscaping & garden redesign Garden redesigns making the most of the compact rear gardens found on most Cambourne plots. Landscaping & garden redesign in Cambourne Why Prime Build in Cambourne ## Why Cambourne homeowners call Prime Build Jack Prime has been in the trade for ten years and is on site day to day. Cambourne is regular territory for us rather than an occasional trip out, we know the estate layouts, the typical wall positions and the access constraints before we arrive. Every job carries £2 million insurance cover and a 6-month workmanship guarantee, and we're rated 5.0 from 36 Google reviews with a 100% recommended record on Facebook. The phone is answered 24 hours a day, and Jack will arrange a time to come and look at the job in person. - 10 years' experience, on site for every job - £2 million public and employers' liability insurance on every job - 6-month workmanship guarantee on completed work - 5.0 rating from 36 Google reviews, 100% recommended on Facebook - Phone answered 24 hours, 7 days a week - Local knowledge of Cambourne's estate house types and tight plot access Local building conditions ## Common issues we're called out for in Cambourne A handful of problems come up again and again on Cambourne's estate housing, and most are straightforward once you know what you're looking at. ### Tight side access for extensions Many Cambourne plots have narrow side passages between houses, which makes planning material access and scaffold placement essential before an extension starts. We walk the access route with you first so there are no surprises once work begins. ### Worn developer-standard patios Original paving laid by the developer twenty-odd years ago is now cracking, sinking at joints or discolouring. Re-laying on a properly prepared base sorts this rather than patching over the same faults. ### Cramped original kitchen layouts Many Cambourne house types were built with a small, separate kitchen. Removing the dividing wall with a steel beam and extending into the garden is the most common way owners solve this. ### Underused single garages A lot of garages on the estate are too narrow for a modern car and end up as storage. Converting them into usable living space is often the simplest way to add a room without extending outward. ### Boundary walls and close-set fencing Where gardens sit close to neighbours, fence lines and low boundary walls need to be set out accurately and built solidly, particularly where ground movement over clay has shifted an existing structure. How the job runs ## The same order of work, every job in Cambourne - Step 1 ### 1. Call or enquiry You call 07915 976616 or send details through the site. The line is answered 24 hours a day, 7 days a week. - Step 2 ### 2. Site visit Jack comes out to look at the job in Cambourne in person: no job is priced without seeing it first. - Step 3 ### 3. Proper pricing Once Jack has seen the site, access and scope, he prices the job properly, with no guesswork over the phone. - Step 4 ### 4. Planning and drawings For extensions and structural work, Jack will tell you if the job needs planning permission or building control approval, and work is carried out to approved drawings where these are required. - Step 5 ### 5. The build Jack is on site for the work itself, bringing in other trusted trades as the job requires, with timescales that depend on the size and complexity of the project. - Step 6 ### 6. Handover and guarantee Finished work is signed off with you, and every job carries a 6-month workmanship guarantee. Common questions ## Building in Cambourne: straight answers Do you cover all of Cambourne, including Upper and Lower Cambourne?Yes. We work right across Great, Lower and Upper Cambourne, and the surrounding villages, as a regular part of our Cambridgeshire coverage from our St Neots base. How fast can you get out to look at a job in Cambourne?The phone is answered 24 hours a day, and Jack will arrange a time to come and look at the job around what's already booked in. How much will my extension or renovation cost?We don't quote figures over the phone. Jack visits, looks at the job properly, access, existing structure, scope, and prices it from what he sees on site. Are you available out of hours?The phone line is open 24 hours, 7 days a week. Site work itself is carried out during normal working hours, on timescales agreed with you in advance. Do you guarantee your work?Every completed job carries a 6-month workmanship guarantee, and we hold £2 million insurance cover throughout. How long does a typical extension in Cambourne take?Timescales depend on the job: the size of the extension, ground conditions and whether structural steels are involved all affect the programme. Jack will give you a realistic timeframe once he's seen the site. Will my extension need planning permission?It depends on the size, position and the property. Jack will tell you when something needs planning permission or building control approval, and any structural work is carried out to approved drawings where these apply. Can you match new brickwork or paving to my existing house?Yes. We match brick, block and paving to the existing property wherever possible, which matters on an estate where most houses share the same original developer finish. Do you take on smaller jobs like fencing or a single patio in Cambourne?Yes, we take on projects of all sizes, from a single fence line or patio through to full extensions and structural work. Nearby ## Other areas we cover close to Cambourne - St Neots - Huntingdon - St Ives - Cambridge - All areas Next step ## Get your Cambourne project looked at properly Call 07915 976616, any time, or send your details through the site. Jack will arrange to come and look at the job in Cambourne and price it from what's actually there. 07915 976616Open 24 hours, 7 days a week · £2 million insured · 6-month workmanship guarantee Extensions, renovations, structural work, brickwork and landscaping across Cambridgeshire, led by Jack Prime. - 5.0 from 36 Google reviews ## Services House extensions - Home renovations & knock-throughs - Structural work & steel beams - Brickwork & bricklaying - Re-pointing & stone slips - Patios - Landscaping & garden redesign - Fencing - Fireplace builds & renovation - New build & self-build homes - All services ## Areas covered - Builders in St Neots - Builders in Huntingdon - Builders in St Ives - Builders in Godmanchester - Builders in Cambourne - Builders in Cambridge - Builders in Sandy - Builders in Hemingford Grey - All areas covered ## Contact - 07915 976616 - primebuild9@gmail.com - 11a St Mary's Street, St Neots, PE19 2TA - Open 24 hours, 7 days a week - About us - Our work - Reviews - Contact © 2026 Prime Build Services Ltd. £2 million public and employers' liability insurance. 6-month workmanship guarantee.Cookie policyPrivacy policyTerms & conditions Call nowGet estimate