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Expert foundation construction across Norfolk — from strip foundations for house extensions to reinforced concrete raft foundations for new builds.
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Foundations are the most critical element of any construction project. Get them wrong and everything above suffers — cracked walls, sticking doors, structural failure. At KiKK Groundworks, we specialise in foundation construction across Norfolk, bringing over a decade of groundworks expertise to every project. We understand Norfolk's challenging soil conditions, from the heavy boulder clay in south Norfolk to the sandy soils around the Broads and the peat deposits in the Fens. This local knowledge is invaluable when designing and constructing foundations that perform for the lifetime of your building.
Unlike general builders who treat foundations as a necessary chore before getting to the "real work," foundations are our core business. Kallan Martin personally oversees every foundation project, ensuring excavation depths, concrete quality, reinforcement placement, and compaction all meet or exceed the structural engineer's specification. We carry full public liability insurance, work to all current Building Regulations, and coordinate directly with Building Control inspectors throughout the process.
We have built foundations for domestic extensions, new-build houses, commercial units, garage conversions, garden rooms, and large-scale civil engineering projects across Norfolk, Wymondham, Attleborough, Great Yarmouth, and the wider Norfolk area. Whether you need simple strip footings for a kitchen extension or a fully reinforced raft foundation for a new build on challenging ground, we have the experience, equipment, and expertise to deliver.
Hundreds of foundation projects completed across Norfolk. We know the local ground conditions and Building Control requirements inside out.
Full public liability insurance and compliance with all current Building Regulations. Complete documentation for your records and mortgage lender.
We coordinate all Building Control inspections, from trench approval through to completion. No stress, no delays, no failed inspections.
Deep understanding of Norfolk’s varied soil types — clay, sand, peat, chalk. We know which foundation type works best for your specific site.
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.
Different buildings, soil conditions, and structural requirements call for different foundation types. We construct all major foundation types used in residential and commercial construction across Norfolk. Below is a detailed explanation of each type, when it is appropriate, and what is involved in constructing it.
Strip foundations are the most common foundation type used in Norfolk for domestic construction. They consist of a continuous strip of concrete beneath load-bearing walls, typically 600mm wide and at least 150mm deep, placed at the bottom of a trench excavated to a depth where stable, load-bearing ground is found. In most areas of Norfolk, this means excavating to a minimum depth of 1 metre, though depths of 1.2 to 1.5 metres are common where trees are present or where clay soils are found.
Strip foundations are suitable for most standard domestic projects including house extensions, conservatories, garages, and garden walls. They work well in stable ground conditions where the bearing capacity is adequate and there are no significant tree root issues. The blockwork or brickwork walls are then built up from the strip foundation to ground level (known as the substructure), before the oversite concrete slab is poured.
Best for: House extensions, conservatories, garages, garden walls, single and two-storey domestic construction on stable ground.
Trench fill foundations are essentially a variation of strip foundations where the trench is filled with concrete to within 150mm of ground level, rather than pouring a thin strip at the bottom and building blockwork up from it. This method is faster, eliminates the need for below-ground blockwork, and is particularly effective in areas with unstable trench sides — which is extremely common in Norfolk's sandy and gravelly soils.
Trench fill is now the preferred method for most foundation contractors in Norfolk because it significantly reduces the time spent working in open trenches (improving safety), uses less labour overall, and provides a more consistent foundation. The additional concrete cost is typically offset by savings in blockwork, mortar, and labour. In our experience, trench fill foundations are the best choice for the majority of domestic projects in the Norfolk area.
Best for: Most domestic construction in Norfolk, especially in sandy or unstable soils. Faster and often more cost-effective than traditional strip foundations despite higher concrete volumes.
Raft foundations (also known as mat foundations) consist of a large, reinforced concrete slab that covers the entire footprint of the building. The slab is typically 200-300mm thick with thickened edges and additional reinforcement under load-bearing walls. Raft foundations spread the building's load over the entire ground floor area, making them ideal for sites with poor bearing capacity or variable ground conditions.
In Norfolk, raft foundations are commonly specified for new builds on sites with soft or made-up ground, areas with a high water table, locations where differential settlement is a concern, and plots where the bearing capacity is insufficient for strip or trench fill foundations. They are also popular for large extensions where the existing ground has been previously disturbed.
Constructing a raft foundation requires careful preparation of the formation level, installation of a damp-proof membrane, placement of steel reinforcement (typically A393 mesh with additional bars at edges and under walls), and a single continuous concrete pour. We use pump-delivered concrete to ensure a consistent pour across the entire slab.
Best for: New builds on poor ground, sites with variable bearing capacity, high water table areas, large extensions on previously disturbed ground.
Pad foundations are isolated concrete pads used to support point loads, typically from steel or timber columns. Each pad is designed to spread the load from a single column over a sufficient area of ground. Pad foundations are common in commercial and industrial construction, steel-framed buildings, and domestic projects such as oak-framed garages, car ports, and pergolas.
The size and depth of each pad depends on the column load and the bearing capacity of the ground. Pads can be plain concrete for lighter loads or reinforced with steel mesh or bars for heavier applications. We regularly construct pad foundations for steel portal frame buildings, agricultural structures, and residential oak-frame projects across Norfolk.
Best for: Steel-framed buildings, oak-framed structures, column-supported buildings, commercial and agricultural construction.
Reinforced concrete bases encompass a range of specialist foundation solutions including piled raft foundations, deep reinforced strips, ground beams, and bespoke engineered solutions for challenging sites. These are typically specified by structural engineers for sites with particularly difficult ground conditions, heavy structural loads, or complex building designs.
In Norfolk, reinforced concrete bases are often required for sites near rivers and waterways (where the water table is high), areas with peat deposits (common in the Broads area and parts of the Fens), brownfield sites with made-up or contaminated ground, and multi-storey commercial developments. We work closely with structural engineers to interpret their designs accurately and construct these specialist foundations to exact specifications.
Best for: Challenging ground conditions, heavy loads, complex designs, sites near waterways, peat or made-up ground, commercial developments.
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 - 1.5m | 1.0 - 1.5m | 200 - 300mm slab |
| Concrete Volume | Lower | Higher | Highest |
| Labour Intensity | High (blockwork needed) | Low | Medium |
| Speed of Construction | Slower (3-5 days) | Fast (1-2 days) | Medium (2-3 days) |
| Best Soil Types | Stable clay, chalk | Sandy, gravelly, unstable | Poor, variable, soft |
| Reinforcement | Usually not required | Usually not required | Always required (mesh + bars) |
| Cost (relative) | ££ | ££ | £££ |
| Tree Proximity | Deeper trenches needed | Deeper trenches needed | Less affected |
| Building Control | Trench inspection required | Trench inspection required | Slab inspection required |
| Common Use in Norfolk | Extensions, garages | Most domestic projects | New builds, poor ground |
Foundation costs in Norfolk vary significantly depending on the foundation type, excavation depth, ground conditions, access to the site, concrete volume required, and any reinforcement specified by the structural engineer. Here is a general guide to help you budget:
| Foundation Type | Cost Per Linear Metre | Avg Extension (20m) | Avg New Build | Includes |
|---|---|---|---|---|
| Strip Foundations | £120 - £180 | £2,400 - £3,600 | £6,000 - £9,000 | Excavation, concrete, backfill |
| Trench Fill | £150 - £220 | £3,000 - £4,400 | £7,500 - £11,000 | Excavation, concrete to GL |
| Raft Foundation | £80 - £120 per m² | £3,200 - £4,800 (40m²) | £8,000 - £14,000 | Slab, mesh, DPM, edge beams |
| Pad Foundations | £200 - £500 per pad | N/A | £2,000 - £5,000 | Excavation, concrete, rebar |
| Reinforced Bases | Project-specific | Project-specific | £10,000 - £25,000+ | Full engineered solution |
Additional costs to consider:
These are guide prices only. Every site is different. Contact us for a free, no-obligation site visit and detailed quote based on your specific project and ground conditions.
We will visit your site, assess ground conditions, and provide a detailed price.
Norfolk has some of the most varied soil conditions in England, and understanding what is beneath your site is essential for choosing the right foundation type and depth. Here is a breakdown of the main soil types we encounter across the county:
Much of south Norfolk and the surrounding villages sit on heavy boulder clay. This soil type has good bearing capacity but is highly susceptible to shrinkage and swelling with moisture changes. Foundations in clay typically need to be deeper (minimum 1 metre, often 1.2-1.5 metres) to get below the zone of seasonal moisture variation. Nearby trees can exacerbate this by extracting moisture from the clay, causing it to shrink and potentially undermining shallow foundations. The NHBC provides specific guidance on foundation depths near trees in clay soils, and we follow these strictly.
Sandy and gravelly soils are common across the northern suburbs of Norfolk and into the Broadland area. These soils generally have reasonable bearing capacity but are prone to trench collapse during excavation — which is why trench fill foundations are almost always the preferred choice in these areas. The advantage of sandy soils is that they drain freely, meaning waterlogged trenches are less of an issue. However, the lack of cohesion means open trenches must be filled quickly for safety.
Areas near the Norfolk Broads, river valleys, and the western Fens often have peat or alluvial deposits at or near the surface. These soils have very poor bearing capacity and are completely unsuitable for standard strip or trench fill foundations. Buildings on peaty ground typically require raft foundations, piled foundations, or other engineered solutions. If you are building near the Broads, the River Yare, or in low-lying areas around Norfolk, a soil investigation is almost always required before foundation design can begin.
Chalk subsoils are found across parts of north-west Norfolk and the Cromer Ridge area. Chalk generally provides excellent bearing capacity and is easy to excavate, making it one of the most favourable ground conditions for foundation construction. Standard strip foundations typically perform very well in chalk, often at shallower depths than clay sites. However, chalk can contain solution features (natural voids) that need to be identified during excavation.
Foundation requirements differ significantly between house extensions and new-build projects. Understanding these differences helps you plan your project effectively and budget accurately.
When building an extension to an existing property in Norfolk, the new foundations must be designed to match or exceed the depth of the existing house foundations. This is to prevent differential settlement, where the new part of the building moves independently of the old, causing cracking at the junction. In practice, extension foundations in Norfolk are typically strip or trench fill, excavated to a minimum of 1 metre depth. If the existing house has deeper foundations (common in older properties), the extension foundations will need to match.
Additional considerations for extension foundations include proximity to the existing building (party wall issues), existing drainage routes that may need diverting, access for machinery (rear extensions often have limited access), and the impact of any trees near the extension footprint. We regularly build foundations for single-storey rear extensions, two-storey side extensions, wrap-around extensions, and garage conversions across Norfolk.
New-build foundations in Norfolk typically require a full structural engineer's design, often based on a site investigation or trial pit results. The foundation type and specification will depend on the ground conditions, the building design and loading, proximity to trees and existing structures, and any site-specific constraints. New builds also require a full Building Control application (not just a building notice), which means approved plans must be in place before foundation work begins.
For new-build projects, we work directly with your architect, structural engineer, and Building Control officer from the outset. We can also recommend trusted structural engineers and architects in the Norfolk area if you need help assembling your project team.
All foundation work in Norfolk requires Building Control approval. Here is what to expect from the inspection process:
Submit a building notice or full plans application to Norfolk City Council (or your district council) before work begins. We can advise on which route is best for your project.
Before any concrete is poured, Building Control must inspect the open trenches. They check depth, width, soil conditions, and confirm the foundation design is appropriate. We schedule this to avoid delays.
Once the trench is approved, we pour the concrete. For raft foundations, the inspector will also check reinforcement placement and membrane installation before the pour.
The ground floor slab (oversite), damp-proof membrane, and damp-proof course are inspected. Once approved, above-ground construction can begin with confidence.
We have an excellent working relationship with Building Control officers across Norfolk. We know exactly what they look for, we prepare our sites to the highest standard before calling for inspection, and we have never failed a foundation inspection. This saves you time, money, and stress.
Every foundation project we undertake follows a proven, systematic process designed to ensure quality, compliance, and efficiency:
We build foundations across Norfolk and the wider Norfolk area, including Wymondham, Attleborough, Dereham, Great Yarmouth, Aylsham, Sprowston, Thorpe St Andrew, Costessey, Hethersett, Poringland, Long Stratton, Cromer, Fakenham, Thetford, Watton, Swaffham, North Walsham, and all surrounding villages. Wherever you are building in Norfolk, we can help with your foundation project.
It is tempting to see foundations as a box-ticking exercise — something that needs doing before the exciting above-ground work begins. But the reality is that your foundations are the single most important element of your entire building project. A poorly constructed foundation can lead to cracking walls, uneven floors, sticking doors and windows, structural movement, damp problems, and in extreme cases, complete structural failure requiring underpinning at enormous cost.
Conversely, well-designed and properly constructed foundations provide a stable, level base that ensures your building performs exactly as intended for its entire lifespan — typically 60 to 100+ years for residential construction. The cost of getting foundations right is a tiny fraction of the total build cost, but the cost of getting them wrong can be catastrophic. This is why choosing an experienced, specialist foundation contractor in Norfolk matters.
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Get a free, no-obligation site visit and detailed quote for your foundation project. We will assess your ground conditions, recommend the right foundation type, and give you an honest price.