Concrete Bases in Raynes Park that stay level, strong and ready to use. From shed and summerhouse slabs to hot tub and garage bases, we build with reinforcement and proper drainage for SW20 homes.
Response within 24 hours
If you’re planning a shed, summerhouse or hot tub, a properly built base is what keeps everything stable for years. We install concrete bases across SW20, including properties near Raynes Park station and Cannon Hill Common. Each slab is set out accurately, finished level, and designed for the load it needs to carry. You’ll get a clean edge, tidy site, and a base that’s ready for installation day.
Raynes Park is a popular commuter suburb with family gardens that often need practical, long-lasting improvements. We regularly work with 1930s semis, Victorian terraces and Edwardian houses where access can be tight and levels can vary. Whether you’re in Wimbledon, New Malden or Motspur Park, we tailor the base depth and reinforcement to suit the structure and the ground. That means fewer cracks, less rocking, and better performance through wet winters.
We start with a site visit to confirm measurements, levels and where water will run. Then we excavate, install a compacted sub-base, add formwork and steel reinforcement where required, and pour quality concrete for a smooth, level finish. We also build in drainage solutions so water doesn’t sit against timber frames or pool under hot tubs. Homeowners choose us for clear communication, punctual scheduling and workmanship backed by a 10-year warranty.
Across the London Borough of Merton, ground conditions can vary from firm subsoil to softer, wetter patches that need deeper sub-bases. Around Raynes Park and West Barnes, many homes have narrow side passages and shared access, so we plan deliveries, barrowing routes and spoil removal carefully. We also consider local drainage patterns and garden gradients, especially near open spaces like Prince George's Playing Fields. Our approach keeps the slab stable and compliant without unnecessary disruption.
Rated 4.9/5 from over 280 verified reviews
Costs depend on size, thickness, access and whether reinforcement is needed. As a guide, small shed bases often start around £350–£800, while larger summerhouse or greenhouse bases are commonly £800–£1,800. Hot tub bases and garage bases usually range from £1,200–£3,500+ due to thicker slabs, steel mesh and stricter levelling. We’ll provide a written quotation after measuring and checking ground conditions.
Most shed or greenhouse bases are completed in 1 day, including excavation, sub-base and pour, provided access is straightforward. Larger slabs for summerhouses, hot tubs or garages typically take 2–3 days, especially if deeper dig-outs, reinforcement and drainage are required. Curing time matters too: light foot traffic is usually fine after 24–48 hours, but heavy loads and installations are best after 7+ days depending on weather.
In many cases, a concrete base for a shed, summerhouse, greenhouse or hot tub is permitted development, as it’s classed as an incidental garden structure. However, rules can change if you’re near boundaries, altering drainage, working on a front garden, or if the outbuilding is large or used as living space. We’ll flag any likely issues, advise on surface water run-off, and help you check London Borough of Merton guidance if needed.
Yes. Our concrete base installations come with a 10-year warranty covering workmanship issues such as settlement caused by inadequate sub-base preparation, poor compaction, or incorrect reinforcement and finishing. It also covers problems that lead to an uneven or unstable slab under normal use. The warranty doesn’t cover damage from structural changes you make later, extreme impacts, or issues caused by third-party installations that breach the slab.
We can build bases to suit sheds, summerhouses, greenhouses, hot tubs and garages, with options including reinforced concrete with steel mesh, thicker edges for heavier loads, and smooth or lightly brushed finishes for grip. We can also add shuttered edges, step-downs for thresholds, and falls to a soakaway or drainage channel. We’ll help you choose the right thickness, finish and drainage approach based on the structure and your garden layout.
Get your free, no-obligation quote today.