

Posi-Joists and Posi-Rafters in London
With a fleet of vehicles visiting London every week, we can offer delivery in as little as 5 working days from order confirmation. Every enquiry receives a FREE design & quotation, with no obligation to purchase after if you're not happy. With well over 100 five-star Google reviews, we're the highest rated timber engineering company in the UK for good reason.
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Excellent website allowed me to order exactly what I needed, and at the best price of all the quotes I had. Communicated prior to delivery as well, and amended delivery time to suit me better. Very satisfied customer!
— Nick swannell
The Benefits of Posi-Joists
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No need for cranes 🪽
Posi-Joists and Posi-Rafters are lightweight and easy to handle, often negating the need for a crane or other expensive hire equipment—ideal around tight London streets.
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Easy to transport 🚚
Posi-Joists and Posi-Rafters are easier to deliver to London than other methods and will fit on smaller vehicles; even in the back of a van if the span isn't too huge.
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Versatile 💪
Whether you need a floor, flat roof or sloped roof, Posi-Joists and Posi-Rafters can be designed and made for virtually all floor and roof applications.
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Ideal for renovations 🏡
If you're taking on a renovation of a property, these metal web joists work perfectly as a replacement floor thanks to their long spanning capabilities and easy routing of services.
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Quick to install 💨
Posi-Joists and Posi-Rafters are quick to install and even quicker to route services through—ideal both for those in the trade and for those paying someone who is!
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More site space 🔨
Rather than having to store vast amounts of timber on site, Posi-Joists/rafters can be delivered just in time for installation.
How far will Posi-Joists span?
Select your joist type, type a span and our calculator will tell you how far you can clear span.
Available Configurations
Depth (mm) | Joist Width (mm) | Centres (mm) | Max Span (mm) |
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Order online in just a few minutes
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Posi-Joist: 202mm Depth
Regular price From £25.81Regular priceUnit price / per -
Posi-Joist: 225mm Depth
Regular price From £27.58Regular priceUnit price / per -
Posi-Joist: 253mm Depth
Regular price From £28.41Regular priceUnit price / per -
Posi-Joist: 304mm Depth
Regular price From £33.88Regular priceUnit price / per -
Posi-Joist: 373mm Depth
Regular price From £41.18Regular priceUnit price / per -
Posi-Joist: 421mm Depth
Regular price From £55.74Regular priceUnit price / per

Or get a bespoke quote from one of our experienced designers
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Cost of Posi-Joists in London
Each job is bespoke, so the price varies quite a bit. For en easy way to price your job, you can build a quote online (and order!) or request a quote here.
Benefits of Posi-Joists over traditional joists
Posi-Joists (or metal web joists, engineered joists, etc) are lighter, can span further, and crucially, can have services routed through them without need for modification, greatly speeding up installation times.
What are Posi-Joists suitable for?
These engineered joists can be used for floors, flat roofs, pitched roofs and more.