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Modern homes built from the 1960s onwards often feature trussed roofs—a structural system that replaced traditional cut roof methods. While trussed roofs offered a quicker and more cost-effective way to build houses, they’ve long been viewed as a barrier when it comes to converting loft space. However, with the right expertise, a trussed roof loft conversion is entirely possible, opening up a world of potential for extra space and added value.
Truss roofs were introduced in response to the growing demand for faster, more uniform construction methods. Pre-engineered and factory-made, these trusses could be craned into place quickly, requiring minimal on-site labour.
The advantages of truss roofs included:
Reduced construction times
Lower labour costs
Standardised designs
Less material waste and improved accuracy
As a result, truss roofs became the go-to choice for volume housebuilders from the late 1960s onwards.
Truss roofs are easy to identify by their distinctive W-shaped framework of timber struts. These criss-crossing beams span the entire loft space and provide structural support by distributing weight across the external walls of the property.
Unlike traditional roofs—which often have open areas between the rafters and purlins, truss lofts are densely packed with timber, leaving little to no usable space without significant modification.
The key difference in a truss roof lies in how the load is distributed. The entire triangulated framework is designed to work together, meaning:
Individual beams cannot be altered or removed without affecting the structure
Modifications must be carefully engineered and approved by Building Control
New supports—typically steel RSJs (Rolled Steel Joists)—are required to safely redistribute the load
This makes compliance with UK Building Regulations particularly important, especially around structural integrity, fire safety, insulation, and safe access.
Traditional cut roofs, built on-site with individual rafters and joists, allow for more design flexibility and often simpler loft conversions. However, they have become less common due to:
Higher construction costs
Longer build times
Shortages in skilled on-site labour
The speed and cost-efficiency of prefabricated roof trusses
As a result, most homes built from the mid-20th century onwards now feature trussed roof structures.
Yes, absolutely. While more technically demanding, a loft conversion in a truss roof property is entirely achievable with the right specialist team. At Absolute Lofts, we’ve completed countless truss roof loft conversions across London and the Home Counties, helping homeowners turn previously unusable lofts into stunning living spaces.
At Absolute Lofts, we specialise in complex loft conversions, including those involving truss roof structures. These conversions require a high level of structural knowledge and precision engineering, which is exactly where our team excels. With over 30 years of experience and a reputation for quality workmanship, we understand the intricacies of working within these confined, timber, heavy loft spaces. From installing steel RSJs to custom, designing new floor layouts and structural reinforcements, we take care of the entire process, safely, efficiently, and in full compliance with Building Regulations. Our tailored approach ensures that no space is wasted and that every conversion delivers lasting comfort, value, and practicality.
Don’t let a truss roof hold you back from creating your ideal loft space. Whether you’re dreaming of a new bedroom, home office, or en-suite master suite, a well-designed truss roof loft conversion can offer the same space and value as any traditional loft.
If your home was built after the 1960s and you’re unsure whether your loft is suitable for conversion, get in touch with Absolute Lofts for a free, no-obligation consultation. We’ll assess your loft, explain your options, and provide expert advice tailored to your property and your vision.
Yes, you can. While truss roofs are more complex to convert than traditional cut roofs, it’s entirely possible with the right structural work and design. Modern engineering solutions allow for safe and effective conversions.
A trusse roof is a type of roof structure made from prefabricated timber frames, usually formed in triangular shapes. These trusses span across the roof space and support both the ceiling and roof load, making them integral to the structure.
Truss roofs often have multiple diagonal supports running through the loft space, which restrict usable space and cannot be removed without alternative structural support. Converting this type of roof typically involves reinforcing the roof structure before removing or altering any trusses.
To convert a trussed roof, new steel beams or laminated timber beams are usually installed to support the weight of the new floor and roof. Once these are in place, the internal webbing of the trusses can be safely removed or repositioned.
Most loft conversions, including those in truss roofs, fall under permitted development rights. However, if your plans exceed certain limits, or if your property is in a conservation area, you may need planning permission. It’s always best to check with your local authority.
Not normally, no. While a truss roof loft conversion may involve additional structural work, it’s not always more expensive than converting a traditional loft. Costs depend on the size of the space, the type of conversion, and the complexity of the design. With the right planning and experienced specialists, a truss roof conversion can be a cost-effective way to add significant value and usable space to your home.
Dormer and hip-to-gable loft conversions are particularly suitable for truss roofs as they provide additional headroom and usable space. A mansard conversion is also an option, though it’s more extensive.
A truss roof loft conversion usually takes between 6 to 10 weeks, depending on the complexity of the build and the size of the property. Your chosen specialist will be able to give a more accurate timeline.
In most cases, no. Many homeowners are able to stay in the property throughout the build, as the majority of the work is carried out from scaffolding and via the roof before the staircase is installed.
Yes, with proper design and structural adjustments, a converted truss loft can offer just as much comfort, style and practicality as a traditional loft conversion.