--- title: "Builder & Groundworks Contractor in Dereham | Humphries Construction" description: "Extensions, groundworks, garage conversions and driveways in Dereham and mid-Norfolk. Owner-managed by Jason, ~45 min from East Winch. 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Around 45 minutes from our East Winch yard." } }, { "@type": "Question", "name": "How quickly can you survey a Dereham site?", "acceptedAnswer": { "@type": "Answer", "text": "Typically within 7 days of your call. Written itemised quote follows within 3 working days. Jason surveys personally." } }, { "@type": "Question", "name": "How much does an extension cost in Dereham?", "acceptedAnswer": { "@type": "Answer", "text": "A typical single-storey rear extension in Dereham runs from around £2,000–£2,400 per m² for a straightforward shell finish, rising with glazing spec, kitchen fit-out and structural complexity. Free survey and written fixed quote within 3 working days." } }, { "@type": "Question", "name": "Do you handle rural groundworks and septic tanks?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Rural mid-Norfolk work regularly involves septic tank or package treatment plant installation and upgrade, private drives, and foundations engineered for chalk-clay ground." } }, { "@type": "Question", "name": "Can you match flint-and-brick construction?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Flint match-in and appropriate lime-mortar repair on older village buildings is part of what we do, using modern cement mortar on old flint is one of the fastest ways to damage the elevation." } }, { "@type": "Question", "name": "Are there planning issues specific to Dereham?", "acceptedAnswer": { "@type": "Answer", "text": "Parts of the town centre are within a conservation area with heritage constraints on materials and fenestration. We flag any planning implications at the survey stage." } }, { "@type": "Question", "name": "Do you offer emergency work in Dereham?", "acceptedAnswer": { "@type": "Answer", "text": "For existing customers, yes. For new enquiries call 07460 036540 and Jason will advise honestly whether it's a job for us or a local specialist." } }, { "@type": "Question", "name": "How do stage payments work on a Dereham extension?", "acceptedAnswer": { "@type": "Answer", "text": "You pay as visible progress happens on site, foundations, weathertight shell, first fix, completion. No large upfront deposit. The exact schedule is agreed in writing before contract signing." } }, { "@type": "Question", "name": "What insurance and guarantees apply in Dereham?", "acceptedAnswer": { "@type": "Answer", "text": "The same as everywhere: £1M public liability, 10-year structural warranty on every extension, 2-year workmanship guarantee on garage conversions, and a written workmanship guarantee on all other jobs." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "/" }, { "@type": "ListItem", "position": 2, "name": "Areas", "item": "/#areas" }, { "@type": "ListItem", "position": 3, "name": "Dereham", "item": "/areas/dereham" } ] } ] --- [07460 036540 ](tel:+447460036540) [info@humphriesconstruction.co.uk](mailto:info@humphriesconstruction.co.uk) Tue–Mon · 7am–7pm [![Humphries Construction](/__l5e/assets-v1/2400a8ee-f8ea-4946-a84c-85d5685b2f83/humphries-logo.png)](/) [Home](/) Services Areas [Our Work](/our-work)[Reviews](/reviews)[About](/about)[Contact](/contact) [07460 036540](tel:+447460036540)[Request Free Quote](/contact) ![Dereham Norfolk market town with the parish church tower above Georgian shopfronts](/assets/area-dereham-BU0tXp4K.jpg) [Home](/)Areas Dereham Dereham · Mid-Norfolk # Builder & Groundworks Contractor in Dereham Owner-managed extensions, groundworks and conversions Dereham is around 45 minutes from our East Winch yard, well within our regular working area. We take on extensions, groundworks packages and full conversions across the town and the surrounding mid-Norfolk villages. [Request Your Free Quote](/contact) [Call 07460 036540](tel:+447460036540) ~45 min from our East Winch yard Free site survey within 7 days £1M public liability insured 25+ Years experience £1M Public liability ~45 min To Dereham 7 days To free survey Fixed Written pricing Serving Dereham ## A local builder, not a passing van. Dereham is a proper Norfolk market town, Georgian and Victorian core around the Market Place and Church Street, mixed 20th-century housing on the ring roads, and a substantial modern estate belt on the outskirts. It sits on mid-Norfolk chalk-clay uplands, which is generally straightforward ground compared with the Fens, but every plot is still worth surveying properly rather than assuming. Coverage We cover Dereham itself and the surrounding mid-Norfolk villages, Yaxham, Mattishall, East Dereham, Toftwood, Scarning, Beeston, North Elmham and the wider NR19, NR20 postcode area. Response times Free site surveys in Dereham are typically booked within 7 days of your call. Jason attends personally. Written itemised quote within 3 working days. Property types we work on - Georgian and Victorian townhouses in the Dereham centre - Interwar and post-war semis on the ring roads - Modern estate housing on the outskirts - Flint-and-brick cottages in the surrounding villages - Rural farmhouses on mid-Norfolk chalk-clay Common local needs - Extensions on cottages, market-town homes and estate housing - Garage conversions on 1980s and 1990s stock - Groundworks on chalk-clay upland ground - New driveways with proper sub-base and drainage - Foundation design near mature trees Services in Dereham ## What we build for Dereham homeowners. [ ![Aerial view of foundation trenches and concrete pump pouring footings on a Norfolk site | groundworks in King's Lynn by Humphries Construction](/__l5e/assets-v1/3759c5db-e751-403b-af69-468f2fee263b/service-card-groundworks.jpg) ### Groundworks Foundations, drainage, muck-away and slabs, the base every other trade builds on. See details ](/services/groundworks)[ ![Finished two-storey rear extension with bifold doors and pitched tiled roof | home extensions in King's Lynn by Humphries Construction](/__l5e/assets-v1/5bbcc651-ec57-47ce-b197-c9b7736b8152/service-card-extensions.jpg) ### Extensions Full single and double-storey extensions, project-managed to a 10-year structural warranty. See details ](/services/extensions)[ ![Completed garage conversion with black weatherboard cladding | garage conversions in King's Lynn by Humphries Construction](/__l5e/assets-v1/eb2d6f13-6e6c-4498-9fcc-5ae998191e69/garage-conversion-finished-01-black-weatherboard-kingslynn.jpg) ### Garage Conversions Cold garages turned into properly insulated habitable rooms in 4–8 weeks. See details ](/services/garage-conversions)[ ![Bricklayer building blockwork foundations on a new-build slab beside a septic tank installation on a Norfolk fen site | new build groundworks in King's Lynn by Humphries Construction](/__l5e/assets-v1/b0fffdf4-3a2a-4ed2-9c0a-0cfe9b7ae5ba/service-card-new-build-groundworks.jpg) ### New Build Groundworks Setting out to oversite packages for self-builders and small developers. See details ](/services/new-build-groundworks)[ ![Freshly laid tarmac driveway serving a new-build bungalow development | driveways in King's Lynn by Humphries Construction](/__l5e/assets-v1/b2004145-629c-41c4-a2d5-7859318331c4/service-card-driveways.jpg) ### Driveways Block, resin, gravel and tarmac drives built on a properly compacted sub-base. See details ](/services/driveways)[ ![Rebar-reinforced foundation ready for concrete pour | foundations and footings in King's Lynn by Humphries Construction](/__l5e/assets-v1/89f17b6c-76ae-4cec-bbec-7d87ff383fea/new-build-groundworks-in-progress-03-rebar-foundation-kingslynn.jpg) ### Foundations & Footings Strip, trench-fill, mass-fill and stepped foundations to engineer's spec. See details ](/services/foundations-footings)[ ![In-progress facing brickwork around a new window opening on a King's Lynn extension | bricklaying in King's Lynn by Humphries Construction](/__l5e/assets-v1/2dedcfea-a9c5-44ca-a2a4-c179c308768b/home-extension-in-progress-02-brickwork-window-kingslynn.jpg) ### Bricklaying Cavity walls, garden walls, chimneys and match-in repair work built to gauge. See details ](/services/bricklaying)[ ![Aerial view of new-build roof framing under construction | general building in King's Lynn by Humphries Construction](/__l5e/assets-v1/8f67993f-d00f-4fb5-b9ba-e3b4d4e766dd/new-build-in-progress-01-aerial-roof-framing-kingslynn.jpg) ### General Building Knock-throughs, structural steels, chimney breast removal and refurbishment. See details ](/services/general-building) Why us in Dereham ## The reasons Dereham homeowners actually pick us. ### Regular working area Dereham is around a 45-minute drive we do routinely. Full crew, second visits and snagging trips all factored into scheduling. ### Mid-Norfolk ground experience Chalk-clay uplands behave predictably in most places, but plots near mature trees or on made-up ground need engineered depth. We survey rather than assume. ### Older stock experience Extensions on Georgian and Victorian Dereham townhouses need heritage-appropriate detailing. We source samples and tint mortar rather than defaulting to modern spec. ### Flint-and-brick match-in Surrounding villages have plenty of flint-and-brick construction. Repair and match-in work is part of what we do, using the right mortar for the right building. ### Local trade coordination Established supplier and merchant relationships mean Dereham jobs get materials on time, not left waiting on deliveries. ### Fixed written pricing Every Dereham quote is itemised and fixed in writing. No mid-job surprises. Local conditions ## What we see on Dereham properties. Dereham and mid-Norfolk sit on mid-Norfolk chalk-clay, generally sound ground for foundations and drainage compared with the Fens. Property-specific issues (age, materials, drainage) are what actually decide how a job runs. ### Shrinkable clay near mature trees Older Dereham gardens have mature trees on shrinkable clay. Foundations near them need engineered depth, often 1.5m+, not standard trench-fill. ### Flint elevation repair Older village buildings around Dereham often have flint elevations. Wrong mortar on repointing or match-in causes ongoing damage rather than repair. ### Rural drainage without mains Many surrounding villages have private drainage, septic tanks or package treatment plants. Extensions often trigger the need to upgrade capacity. ### Modern extensions against old lime-mortar walls Bad past extensions on older Dereham stock have often used modern cement mortar against original lime, the modern extension traps moisture in the older wall, causing damp and face-spalling. Our process ## Three steps. Same everywhere we work. [Talk to Jason](tel:+447460036540) 1. 01 ### Free site survey We visit within 7 days, walk the job with you and understand exactly what you want built. 2. 02 ### Fixed written quote Itemised written quote, usually within 3 working days. No pressure, no obligation. 3. 03 ### On site & handover Contract signed, works start within 4–8 weeks. Stage payments and final handover with paperwork. FAQ · Dereham ## Straight answers, local specifics. If your question about Dereham isn't below, call Jason on 07460 036540, he'll answer honestly whether it's a job for us or not. Do you cover Dereham? Yes, Dereham and the surrounding mid-Norfolk villages (Yaxham, Mattishall, Toftwood, Scarning, Beeston, North Elmham and beyond) are all part of our regular working area. Around 45 minutes from our East Winch yard. How quickly can you survey a Dereham site? Typically within 7 days of your call. Written itemised quote follows within 3 working days. Jason surveys personally. How much does an extension cost in Dereham? A typical single-storey rear extension in Dereham runs from around £2,000–£2,400 per m² for a straightforward shell finish, rising with glazing spec, kitchen fit-out and structural complexity. Free survey and written fixed quote within 3 working days. Do you handle rural groundworks and septic tanks? Yes. Rural mid-Norfolk work regularly involves septic tank or package treatment plant installation and upgrade, private drives, and foundations engineered for chalk-clay ground. Can you match flint-and-brick construction? Yes. Flint match-in and appropriate lime-mortar repair on older village buildings is part of what we do, using modern cement mortar on old flint is one of the fastest ways to damage the elevation. Are there planning issues specific to Dereham? Parts of the town centre are within a conservation area with heritage constraints on materials and fenestration. We flag any planning implications at the survey stage. Do you offer emergency work in Dereham? For existing customers, yes. For new enquiries call 07460 036540 and Jason will advise honestly whether it's a job for us or a local specialist. How do stage payments work on a Dereham extension? You pay as visible progress happens on site, foundations, weathertight shell, first fix, completion. No large upfront deposit. The exact schedule is agreed in writing before contract signing. What insurance and guarantees apply in Dereham? The same as everywhere: £1M public liability, 10-year structural warranty on every extension, 2-year workmanship guarantee on garage conversions, and a written workmanship guarantee on all other jobs. Ready when you are · Dereham ## Get your Dereham project priced by a builder who does the drive. Free site survey within 7 days across Dereham. Written, itemised fixed quote within 3 working days. Owner-managed by Jason personally, no call centre, no middlemen. [Request Your Free Quote](/contact) [Call 07460 036540](tel:+447460036540) What you're covered by - £1,000,000 public liability insurance - 10-year structural warranty on every extension - 2-year workmanship guarantee on garage conversions - Fixed written price, no mid-job surprises Nearby areas ## Also serving We cover Dereham and the surrounding West Norfolk villages and market towns from our East Winch yard. [Swaffham ](/areas/swaffham)[Fakenham ](/areas/fakenham)[Norwich ](/areas/norwich)[West Norfolk ](/areas/west-norfolk)[Not sure we cover you? Ask Jason directly. ](/contact) ![Humphries Construction](/__l5e/assets-v1/2400a8ee-f8ea-4946-a84c-85d5685b2f83/humphries-logo.png) Groundworks and general building contractor serving King's Lynn, West Norfolk and beyond. Owner-managed by Jason Humphries with 25+ years on the tools. £1M Public Liability Insured #### Services - [Groundworks](/services/groundworks) - [Extensions](/services/extensions) - [Garage Conversions](/services/garage-conversions) - [New Build Groundworks](/services/new-build-groundworks) - [Driveways](/services/driveways) #### Areas Covered - King's Lynn - West Norfolk - Norwich · Downham Market - Swaffham · Fakenham - Hunstanton · Wisbech · Dereham #### Contact - [07460 036540](tel:+447460036540) - [info@humphriesconstruction.co.uk](mailto:info@humphriesconstruction.co.uk) - Station Cottage, Gayton Road, East Winch, Norfolk - Mon–Fri 7am–7pm Sat 8am–5pm · Sun 10am–4pm © 2026 Humphries Construction. All rights reserved. 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