Open Hours: Monday-Friday: 8:00-16:00,
Saturday: 10:00-14:00, Sunday: Closed
SALE NOW ON: We can now offer a 10% discount on all buildings (10% off basic price all extras normal price)
A 20×12 shed offers generous space for serious storage, workshop use or larger garden projects. With 240 square feet of internal floor area, this extra large shed is ideal for customers who need more than standard garden storage.
Built to order using quality timber, a 20×12 shed provides strength, flexibility and long-term durability. Whether you’re creating a dedicated workshop, storing commercial equipment, or organising large machinery, this size delivers practical, versatile space.
Delivered and assembled for free within Hampshire.
As a long-established, family-run business, we’ve become known for our personal, locally-based service, delivered by a friendly team that takes pride in every build.
Every Elfords timber building is crafted by our own skilled joiners using time-tested methods and premium materials for strength, precision and lasting performance.
We believe that exceptional quality doesn’t have to cost the earth. Our buildings outlast cheaper alternatives, offering genuine value, and long-term peace of mind.
Choose from our range of quality timber sheds, available in a variety of sizes and roof styles.
Pick from one of our four types of cladding, and personalise your shed with optional extras such as extra windows, double or stable doors or a timber floor upgrade.
Manufactured in our Portsmouth workshop and expertly assembled by our team on site so you can enjoy a shed built to your specifications and made to last.
A 20×12 shed typically measures approximately 20 feet wide by 12 feet deep, providing around 240 square feet of internal floor space. Internal dimensions may vary slightly depending on timber thickness, roof style, and build specification.
This substantial footprint makes it suitable for workshop use, commercial storage, or customers who require significant outdoor building space.
A 20×12 shed offers extensive internal capacity and is commonly used for:
The 12ft depth allows room for workbenches and shelving, while the 20ft width provides comfortable movement inside.
Yes — a 20×12 shed is often chosen by tradespeople, hobbyists and small businesses who require a dedicated workspace separate from the main property.
With reinforced flooring and strong framing, this size can support heavier equipment and regular use. It’s a practical solution for those who need reliable space without committing to a permanent brick-built structure.
When choosing a 20×12 shed, structural strength is especially important. Key considerations include:
A well-built large timber shed can provide dependable storage or workspace for many years.
In many cases, a 20×12 shed may fall within permitted development guidelines, but this depends on height, placement, and intended use.
Because of its larger size, it’s important to check:
If you are unsure, it is advisable to check with your local planning authority before installation.
A 20×12 shed is a good choice if you’re looking for:
If you require a versatile building with generous internal space, a 20×12 shed offers flexibility and long-term practicality.
At Elfords, we help customers choose the right shed size for their garden, workshop or business needs, offering expert advice and made-to-order timber buildings.
If you’d like guidance on whether a 20×12 shed is the best option for your space, our team is happy to help.
All sheds come with 11mm OSB and polyester felt.
Elfords has been crafting made-to-order timber sheds, workshops and summer houses in Portsmouth since 1982. No flat packs or mass production — just solid, reliable buildings built in-house and delivered with the personal service of a trusted, family-run team.
Need a new shed? We’re ready whenever you are.
Encourage visitors to visit the showroom or contact Elfords using the different methods detailed below.
