Plastic Garden Shed Base
Swift Leveller is a UK-based specialist in adjustable foundation systems designed to make the installation of garden buildings quicker, easier and more secure. With years of industry experience and a focus on quality engineering, we offer durable, weather-resistant kits that provide strong, level support without the need for a concrete base or digging. Our products are ideal for a wide range of outdoor structures, including timber sheds, summerhouses, greenhouses and of course, the plastic garden shed base. Whether you’re setting up a new garden building or replacing an old foundation, our kits give you a stable platform on all types of ground. If you’re planning a new install, this helpful guide to building a shed base covers everything from site preparation to final assembly. Each kit is easy to install, fully adjustable and built to perform in real garden conditions, making them a smart, maintenance-free and long-lasting alternative to traditional base methods.
Screw the head u channel of the Swift levelling device to the frame at equal intervals. Complete this for the whole frame.
Flip the timber frame over so that the bases point to the floor. Slide the templates to the ground and pin them in position.
Move the frame leaving the templates in place, and drill the large centre holes in the ground.
Insert the base plates into the ground. Position the heads and frame over the large centre holes and drop into place.
Adjust each head to the required height and tighten each nut to secure the frame. Use a spirit level to check, and adjust if necessary.
Foundation for Plastic Shed
Our adjustable base systems are designed to provide a secure, solid foundation for plastic shed installations of all sizes. Built from durable, weather-resistant materials and engineered for strength, each leveller in the kit allows for precise height adjustment, helping you create a stable base on sloped or uneven ground without the need for concrete or heavy groundwork. Whether you’re installing a compact storage shed or a larger plastic garden building, we offer four tailored options to suit your needs: the Mini for smaller structures, the Flexi for everyday use, the Max for heavier loads and the XL for larger or commercial-scale builds. Easy to install and built to last, our kits give you peace of mind from the ground up. We also offer free delivery on all kits, typically within 3–5 working days.
Each plastic garden shed base pack is carefully assembled to give you everything you need for a strong, stable and straightforward installation. Designed with ease and reliability in mind, every kit includes:
• Fully adjustable levellers to create a level base on uneven or sloped ground
• Heavy-duty fixings to ensure secure and lasting support
• Clear, easy-to-follow assembly instructions to guide you through setup step-by-step
• Pack size options of 4, 6, 8, 10 or 12 to suit various shed dimensions
• Optional add-ons available for extra stability or bespoke configurations
With all components made to perform in real garden conditions, our kits are built to simplify your project from start to finish.
Our adjustable systems offer a smarter, more flexible alternative to traditional foundations like concrete slabs or paving. Designed for ease of use and long-term performance, they eliminate the need for digging, drying time or permanent groundwork—saving you time, mess and labour. The fully adjustable levellers allow you to easily create a level base on uneven or sloped ground, giving your foundation for plastic shed the support it needs from day one. Unlike rigid bases, our system is reusable and can be adapted or relocated if your needs change. It’s a clean, fast and reliable solution that delivers lasting strength without the hassle. If you’re unsure whether your shed requires additional support, this guide explains why a foundation is important and explores the different options available.
Plastic Shed Base Kit
When you choose Swift Leveller, you’re investing in proven expertise and carefully engineered quality. With years of experience in outdoor structure foundations, we’ve developed a range of products that combine strength, adjustability and long-term reliability—all made to perform in real garden conditions. Every plastic shed base kit is built using durable, weather-resistant materials and designed to simplify installation without compromising stability. As a sister company of Isaac Granger’s, we bring a heritage of precision and performance to every product we make. Whether you’re an experienced tradesperson or tackling a DIY project, our commitment to quality means you can build with confidence.
Do you have questions about choosing the right plastic shed base kit or whether you need planning permission for your project? Our team is here to help you select the perfect option for your structure and ground type. If you’re unsure, please contact us and we’ll guide you through everything you need to get started successfully.