The Swift Foundation Plinth & Raft Kit is designed to be fast, simple, and DIY-friendly. Most customers find they can assemble the complete foundation and floor base in a couple of hours to just one day, depending on ground conditions and building size. Compared to 4-7 days with wet concrete slabs.

Every kit arrives clearly labelled with pre-cut timbers, pre-cast plinths, and pre-hung joist hangers — meaning no measuring, no waiting for concrete to cure, and no specialist tools needed. If your ground isalready prepared and level, you can start building your garden room, home office, or summerhouse the very same day.

👉 Perfect for homeowners across the UK who want a quick, mess-free, and professional-grade foundation solution.

Great question! While all Swift Foundation systems are engineered for strength and simplicity, here’s the key difference:

• Swift Plinth – Our original modular foundation plinth system, ideal for small to medium garden buildings. Each plinth supports up to 1 tonne, with up to 100 mm of height adjustment for uneven ground.
• Swift Plinth Plus – A heavy-duty version for larger or heavier buildings, supporting up to 2.5 tonnes per plinth and offering 150 mm of adjustment.
• Swift Foundation Raft (All-in-One) – A complete foundation and floor base system. It includes the plinths, bearers, joists, pre-hung joist hangers, fixings, and everything you need in one delivery

So, if you want the fastest and most complete “ready-to-build” option, the All-in-One Raft Kit is your best choice. The Plinth and Plinth Plus systems are perfect if you already have your own floor bearers or prefer a modular approach.

Yes! The All-in-One Raft Kit features pre-hung joist hangers, which means the metal joist brackets are already attached to the timber bearers before delivery.

In simple terms, this saves you a lot of time on site — just drop the joists into the pre-fitted hangers and you’re ready to go. No measuring, marking, or fixing brackets yourself.

For the Swift Plinth and Swift Plinth Plus systems, you still receive the height-adjustable steel brackets that hold the bearers, but joist hangers are not pre-installed since you’re supplying your own timber frame.

Absolutely! Swift Foundations specialises in custom and made-to-measure solutions.

f your building size doesn’t match one of our standard kits, we can create a bespoke Swift Foundation Raft or custom Plinth system to fit your exact footprint. Just provide your dimensions and project details, and our design team will supply a tailored quote — perfect for unique garden offices, annexes, and modular buildings across the UK.

Yes, it can! All Swift Foundation systems are designed to handle natural variations in ground level.

• The All-in-One Raft Kit offers around 50 mm of height adjustment per plinth bracket.

• The Swift Plinth system handles differences of up to 100 mm.

• The Swift Plinth Plus can manage up to 150 mm – ideal for sloping or uneven garden plots.

This means you don’t need to dig out or pour a concrete base – simply position, adjust, and level the plinths. For very steep or unstable ground, we recommend light ground preparation or consultation with a local installer.

• Quick, clean installation – No digging or concrete required.

• Precision-engineered in the UK – Built to last in all weather.

• Bespoke options available – Made to fit your building exactly.

• Perfect for garden rooms, home offices, annexes, and more.

Whether you’re in London, Manchester, Birmingham, Bristol, Glasgow, or anywhere across the UK, our

kits arrive ready to assemble with clear instructions and nationwide delivery.