Roof Trusses: Types & How to Choose 2026

Common roof truss types

The fink (or ‘W’) truss is the standard for most houses — economical and strong, but its internal webs fill the loft. Attic (room-in-roof) trusses leave a clear central space for a future loft room. Mono-pitch trusses give a single slope for extensions and outbuildings, raised-tie trusses lift the ceiling line, and scissor trusses create a vaulted ceiling. The roof shape and how you want to use the space decide which suits.

Attic trusses vs standard trusses

Standard fink trusses are cheapest but block the loft with diagonal webs, so a later conversion means restructuring. Attic trusses cost more up front but build in a usable room shape from day one, with the floor already designed to take a habitable load. If there is any chance you will convert the loft, attic trusses are usually the cheaper route overall.

Trusses vs a traditional cut roof

Factory trusses are quick to erect, precise and cost-effective for standard rectangular roofs. A traditional cut roof, built rafter by rafter on site, suits complex shapes, one-off designs and rooms with open vaulted ceilings, but takes longer and costs more in labour. Most new builds use trusses; renovations and bespoke roofs often use a cut roof.

How to choose and compare quotes

1. Confirm the roof shape and spans

The span, pitch and overall shape determine which truss type and size you need.

2. Decide if you want loft space

If a future room is likely, specify attic trusses now to avoid a costly conversion later.

3. Order to the engineer's design

Trusses are made to an engineer's calculations, so get the design signed off before ordering.

4. Get three like-for-like quotes

Compare suppliers on the same truss design and delivery so you judge value, not just price.

FAQs

Related guides

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