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Roof Construction

Attic Truss vs Stubbed Truss

Understanding An Attic Truss In Comparison To Stubbed Truss in Loft Conversions

When planning a roof lift or traditional loft conversion, it's crucial to understand the differences between an attic truss, and stubbed truss (also called a stub or stepped truss). These terms refer to different types of roof structures, each with its own implications for the space available and the potential for conversion.

Attic vs Stub Truss

Attic Truss For A Loft Conversions


An attic truss, also known as an eaves truss, combines the features of an attic and a truss to create a functional space below the pitched roof of a house. This type of truss is designed to provide both structural support for the roof and additional storage or living space in the attic.

The height and structure of an attic truss can vary depending on the specific design of the house. Some attic trusses may have enough room for a loft conversion without major structural changes, while others may require alterations to create sufficient headroom.


Traditional cut roof trusses are typically made from timber and consist of a series of triangles that provide stability. However, attic trusses have a web-like structure that can pose challenges for loft conversions. Converting an attic truss often involves adding steel beams to support the new floor and create additional headroom.

Overall, an attic truss offers the advantage of combining the functionality of an attic with the structural support of a truss, making it a versatile option for homeowners looking to maximise their roof space.

Stubbed Truss For A Loft Conversions


A stubbed truss is a modified version of a standard truss. The lower section of the truss is 'stubbed' off to create more room internally without raising the overall roof ridge height.


This can be particularly beneficial where planning restrictions prevent changes to the external appearance of the house. A stubbed truss can provide more usable space in the loft without altering the roofline.

The type of roof structure you have will greatly impact your loft conversion project. An attic may require minimal structural changes, while a truss or stubbed truss may require more extensive work as the external brickwork will need to be built up to meet the roof line.


However, a stubbed truss can offer the advantage of increased internal space without affecting the external appearance of your property. This can be a major benefit if you are restricted by planning regulations.

By lifting the internal height, a stubbed truss may be the only option for buildings with a minimal depth where a dormer is not viable or desired.

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Attic vs Stubbed Truss - A Visual View On How It Might Effect Your Loft Conversion

Below, is it visual of an attic, truss overlaid onto the same stubbed truss. As you can see the left of the truss, whilst maintaining the same ridge height, greater overall space in the finished loft. The additional space is represented by the red outlined area.


Comparison Table

To help further, here is a quick comparison table between the two truss type side by side. This might help you choosewhich design best suits your loft conversion or raise roof lift conversion.

Attic Truss
Stubbed Truss
Cost Implications
This is the cheaper of the two options as no external brickwork is required other than the gables being lifted to the new roof height. However a dormer may be required to create the same usable foot print, which adds cost.
In a straight comparison, this is a more expensive option due to the uplift in brickwork and/or render. If this removes the need for dormers, then may be more cost neutral or cheaper.
Eaves Storage
This truss style usually allows for eaves storage beyond the ashlar wall.
Typically, less usable due to additional strengthening required for this type of layout.
Project Completion Time
This is generally quicker as no additional brickwork is required
Extended installation time due to uplift in brickwork.
Room Width
Typical not as wide as the stubbed truss as strengthening encroaches further into the room.
The room width is usually wider, given a great overall foot print as well as walkable footprint.
Head Height
Has the same central head height as a stub truss, but has less height as you move to the external wall.
More head height overall, and may negate the need for a dormer to create the same usable footprint.

Attic vs Stub Truss Loft Conversion FAQ

Below is the most frequently asked questions about a stub or attic truss loft conversions and roof lifts.

  • Not enough height in my loft, what can I do?
    First of all don't panic, you might have a lot of options then you think. Here are some of the options you might be able to use Lower Ceilings Drop Landing For more information visit
  • Can my loft be converted?
  • Is a loft conversion cheaper than an extension?
    Yes, in many ways it can be cheaper but this will depending on your loft size, if it can be converted and what you want to use your new space for.
  • Do I need planning permission for a loft conversion?
    In most cases you don't need planning permission.
  • Do I need planning permission for a roof lift loft conversion?
    Yes, anytime you raise the overall roof height, also know as the ridge height, you'll need planning permisison.
  • What is an Lawful Development Certificate?
    A Lawful Development Certificate (LDC)
  • What does Permitted Development mean?
    Permitted Development (PD) rights
  • Can I customise my loft conversion?
    Yes, absolutely, every loft conversion or roof lift is custom designed and tailor to your exact needs from the day starting your projevct with Milestone Homes & Lofts.
  • What is a hip to gable loft conversion?
    A hip to gable loft conversion
  • What are the different types of loft conversions?
    There is a wide range of loft conversion types, and many can be merge into one design, such as roof lift with a dormer.
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