Foundation Contractor Norfolk
KiKK Groundworks designs and installs foundations across Norfolk for house extensions, new builds, garages and commercial projects. Every job is specified to actual ground conditions not a standard depth applied county-wide.
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Norfolk is not one type of ground. It never has been.
The chalk bedrock that runs through north Norfolk from Cromer down through Fakenham behaves completely differently from the heavy clay you find across the Broadland valley floors and south of Norwich. Mid-Norfolk, Dereham, Wymondham and Attleborough sit on a mix of glacial till and sandy soils that shifts from plot to plot. Coastal areas around Great Yarmouth sit on made ground and loose sand that can surprise even experienced contractors.
This matters enormously for foundations. A foundation depth that works on a chalk site near Cromer is not deep enough on a clay site in Wymondham. A strip foundation specification that suits a sandy plot in mid-Norfolk may be the wrong type entirely for a clay-shrink area near the Broads.
KiKK has installed foundations across all of it. Kallan Martin assesses actual ground conditions on every site visit before a foundation type or depth is recommended. Not based on the postcode. Not based on what the last job nearby looked like. Based on what the ground does on your specific plot, at your specific depth, at the time of year you are building.
That is the only way to specify foundations in Norfolk correctly.
Every set of foundations KiKK installs in Norfolk passes Building Control inspection first time. This is the result of specifying correctly from the outset: the right foundation type, right depth, right concrete mix, with no corners cut.
Full public liability insurance and compliance with all current Building Regulations. Complete documentation for your records and mortgage lender.
Kallan has opened trenches across Norfolk on chalk, clay, sand, gravel, made ground and everything in between. He knows which soil types cause problems at which depths and how to adapt when the ground does not match the survey.
KiKK handles the full foundation package: excavation, concrete, backfill, oversite slab and DPC level, under one contract. One team, one point of contact, one fixed price.
Kallan is on site personally for every foundation pour. No project managers, no subcontractors. The person who quoted the job runs the job.
No-obligation site visits with honest, detailed advice. We will tell you exactly what foundation type you need and what it will cost. No surprises on the invoice.
Different buildings, soil conditions and structural requirements call for different foundation types. KiKK installs all major foundation types used in residential and commercial construction across Norfolk.
Strip foundations are the most common foundation type for house extensions and new builds across Norfolk. A continuous concrete strip is cast below the load-bearing walls, transferring the structural load down into stable ground.
In most parts of Norfolk, strip foundations work well on chalk, gravel and firm sandy ground where the bearing capacity is good and the soil is stable year-round. They are straightforward to inspect, straightforward for Building Control to approve, and cost-effective on straightforward ground.
Where strip foundations become problematic in Norfolk is on clay soils, particularly in the Broadland area and south of Norwich. Clay shrinks in dry summers and swells in wet winters. Under a standard-depth strip foundation, that seasonal movement causes cracking. On clay, you need to go deeper or switch to trench fill.
Trench fill is KiKK's most commonly specified foundation type on Norfolk clay sites. Instead of a narrow strip of concrete at the base of a wide trench, trench fill fills the entire trench with concrete almost to ground level. This eliminates the space for soil movement to act on the foundation walls.
It uses more concrete than a strip foundation. It is faster to construct. And on Norfolk clay, which covers a significant portion of the county, it is the specification that Building Control inspectors expect to see.
The key difference between a competent contractor and a cheap one on a clay site in Norfolk: the competent contractor specifies trench fill at the right depth. The cheap contractor pours a strip at 600mm and moves on. The cracks show up in the extension wall eighteen months later.
Trench fill on a typical single-storey extension in Norfolk runs from £5,000 to £9,000 depending on depth required and site access. KiKK will tell you at the site visit whether your ground calls for strip or trench fill and why.
Raft foundations spread the structural load across a wide reinforced concrete slab rather than concentrating it in strips below walls. They are used where ground bearing capacity is poor, where ground conditions are variable across the plot, or where a traditional strip or trench fill would be impractical.
In Norfolk, raft foundations come up most often on:
Raft foundations cost more than strip or trench fill for the same floor area, typically £8,000 to £18,000 for a residential extension depending on slab thickness, reinforcement specification, and site conditions. When the ground calls for a raft, it is not optional. Building over inadequate foundations in Norfolk costs far more to repair than it would have cost to specify correctly.
Pad foundations are isolated concrete bases used to support specific point loads, typically steel or timber columns rather than continuous load-bearing walls. They are most common on commercial projects, open-plan extensions with steel frames, and agricultural buildings across Norfolk.
KiKK installs pad foundations as part of larger groundworks packages on commercial and development sites across Norfolk and East Anglia.
Conservatory bases in Norfolk are a common inquiry and one where a lot of homeowners have been let down by contractors who underspecified the foundation.
A conservatory base is not just a concrete slab poured onto topsoil. It requires proper excavation to remove organic material, a compacted hardcore sub-base, DPC, blinding, and oversite concrete to Building Control specification. On clay ground, which covers a large part of Norfolk's residential areas, it requires additional depth to get below the shrink-swell zone.
Conservatory bases installed to the minimum possible standard tend to move. The glazing cracks. The frames distort. Doors stop closing properly. The conservatory becomes expensive to use and expensive to fix.
KiKK specifies and installs conservatory and garden room bases to full Building Control standard across Norfolk. If a structural engineer's input is needed, we can recommend contacts we work with regularly across the county.
Choosing the right foundation type depends on your ground conditions, building type, budget, and structural engineer's recommendations. Here is a side-by-side comparison of the three most common foundation types used in Norfolk:
| Feature | Strip Foundations | Trench Fill | Raft Foundations |
|---|---|---|---|
| Typical Depth | 1.0 to 1.5m | 1.0 to 1.5m | 200 to 300mm slab |
| Concrete Volume | Lower | Higher | Highest |
| Labour Intensity | High (blockwork needed) | Low | Medium |
| Speed of Construction | 2 to 4 days | 1 to 2 days | 2 to 3 days |
| Best Soil Types | Chalk, gravel, firm sandy ground | Clay, sandy, unstable | Poor, variable, soft |
| Reinforcement | Usually not required | Usually not required | Always required (mesh and bars) |
| Typical Cost (extension) | £3,500 to £7,000 | £5,000 to £9,000 | £8,000 to £18,000 |
| Building Control | Trench inspection required | Trench inspection required | Slab inspection required |
| Common Use in Norfolk | Chalk and gravel sites, garages | Clay sites, most domestic projects | Coastal ground, brownfield, Broads |
Kallan will visit your site, assess the ground conditions, and provide a written quote specifying exactly what your project needs. No phone estimates. No standard depths applied without looking at the ground first.
Most clients planning an extension in Norfolk have not been through the foundation process before. Here is exactly what happens when you use KiKK.
Kallan visits your site before providing any quote. He assesses access, soil type, proximity of trees, drainage conditions, and the structural engineer's drawings if available. On sites where ground conditions are unclear, he may recommend a trial pit. This site visit is free.
KiKK provides a written quote specifying foundation type, excavation depth, concrete volumes, reinforcement requirements, and timeline. The quote is fixed price. If ground conditions change when we open up, we stop, call you, and agree to any variation before proceeding.
KiKK notifies Building Control and arranges the inspection, coordinating with your relevant local Norfolk authority. The inspector visits to check excavation depth and soil conditions before concrete is poured. KiKK manages this directly.
KiKK coordinates ready mix concrete delivery, supervises the pour, and ensures the concrete is laid, tamped and finished to the correct level. Concrete requires a minimum of seven days to reach working strength, and 28 days for full design strength.
KiKK installs foundations across the full county of Norfolk. Areas we work in most regularly for foundation projects:
Norwich and greater Norwich | Wymondham | Hethersett | Attleborough | Dereham | Great Yarmouth | Thetford | King's Lynn | Fakenham | Cromer | Sheringham | Aylsham | Wroxham | Long Stratton | Harleston | Swaffham | Watton
Not sure if we cover your area? Call 01603 381016.
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FAQ
It depends on your location and soil type. North Norfolk chalk areas typically need 450mm minimum. Clay soils in south and central Norfolk usually require 750mm to 1 metre, deeper near trees. Sandy ground in mid-Norfolk needs site-specific assessment. KiKK assesses every plot individually, never by county average.
Strip foundations use a narrow concrete strip at the base of a trench, with the trench walls left exposed. Trench fill fills the entire trench with concrete to near ground level. On Norfolk clay, trench fill is generally the better specification; it removes the space for soil movement to act on the foundation. Strip foundations suit stable, non-clay ground.
Strip foundations for a standard single-storey extension typically run £3,500 to £7,000. Trench fill on clay ground costs £5,000 to £9,000 for the same floor area. Raft foundations run £8,000 to £18,000 depending on size and reinforcement. All prices depend on depth required, access, and ground conditions found on site.
Yes always. Foundation work for extensions and new builds requires Building Control approval in England. KiKK manages all notifications and inspections directly with your local Norfolk authority. You do not need to handle this yourself.
A raft is typically specified where ground bearing capacity is poor, where the plot has variable fill or made ground, or where a structural engineer has identified differential settlement risk. In Norfolk, raft foundations are most common on low-lying coastal ground, brownfield sites, and plots near the Broads. KiKK will advise at the site visit.
Excavation and concrete pour for a standard single-storey extension typically takes two to four days on site. Add seven days minimum for concrete to reach working strength before building work continues. Larger or more complex foundation packages run five to ten days on site.
Not always. For straightforward extensions on standard ground in Norfolk, KiKK can work to Building Control minimum requirements. For larger projects, unusual ground conditions, or anything involving steel frames or complex loading, a structural engineer's drawings are advisable. KiKK can recommend engineers we work with regularly across Norfolk.
Other Services
Kallan will visit your site, assess the ground conditions, and provide a written quote specifying exactly what your project needs. No phone estimates. No standard depths applied without looking at the ground first.