Roof Truss Cost Calculator

How this calculator counts and prices trusses

A truss is a factory-built triangular frame, engineered off-site and set with a crew or crane, that carries the roof load down to the exterior walls. This calculator turns your home's footprint into a truss count, then prices that count against a per-truss cost band that varies by truss type and a span multiplier.

Truss type moves the material band more than anything else: this calculator's gable/common trusses start at $80 each, while attic trusses — engineered to leave usable storage space — start at $150, and scissor trusses for a vaulted ceiling start at $120. Switching truss type without changing anything else can shift the total by thousands of dollars on an otherwise identical home.

Why span and story count add cost separately

Span — the distance a single truss stretches, wall to wall — and story count affect the estimate through two different mechanisms. Span drives the material multiplier because a wider truss needs heavier, more expensive lumber and more engineering per unit; this calculator scales that multiplier from 0.80 at 20 ft or less up to 1.50 above 40 ft. Story count doesn't touch the per-truss price at all — it only triggers a flat $500–$1,200 crane-rental line once you select two or more stories, because the limiting factor there is lifting height, not truss size.

That distinction matters when you're pricing an addition versus new construction. A single-story addition with a wide span pays the span premium but not the crane charge; a compact two-story home pays the crane charge even if every truss is a standard 20–30 ft span. Ask your contractor which of the two you're actually paying for — they show up as separate items on a well-itemized quote for exactly this reason.

Where truss cost sits inside a construction budget

Truss setting is framing labor, part of the broader construction and extraction trade the Bureau of Labor Statistics tracks at 6.4 million jobs nationally with a May 2025 mean annual wage of $65,360 — above the $58,140 mean for roofers specifically, since framing crews and roofers are not the same trade even though both work on the same roof system.

Framing — the construction stage that includes roof trusses — is also the one place NAHB's 2024 Cost of Constructing a Home survey gives a sourced anchor: it's 16.6% of total construction cost, the third-largest of the eight stages NAHB breaks out, behind interior finishes (24.1%) and major system rough-ins (19.2%). That figure covers all framing, not trusses alone, so treat it as context for where truss spending sits in the whole build rather than a truss-specific percentage.

By comparison, a full asphalt-shingle roof replacement — tear-off and reroof on existing framing, no new trusses involved — averages $31,871 in job cost nationally per the 2025 Cost vs. Value report from the Journal of Light Construction. That number is a useful contrast, not a substitute: it prices shingles over an existing deck and frame, while this calculator prices the frame itself, which is why new-construction truss packages and reroof jobs land in such different ranges even on similar-sized roofs.

What this estimate excludes

This page prices the truss package and its installation. Several adjacent costs are not in the number:

• ·Decking. Trusses are the skeleton; the sheathing nailed across them is priced on the roof decking calculator.
• ·Engineering stamps and permit review. Truss packages ship with engineered layout drawings, but any additional local plan review or permit fee is set by your jurisdiction and not modeled here.
• ·Removing an existing roof structure. This is a new-truss price. Demolition of stick-framed rafters or a failed existing truss system is a separate line.
• ·Interior ceiling or drywall work. Attic and scissor trusses that change ceiling shape often require additional interior finish work beyond the truss cost itself.

There's no independent government data set to check truss pricing against, either. The Census Bureau's Characteristics of New Housing (CHARS) survey tracks size, bedrooms, bathrooms and exterior wall material for new single-family homes; it does not track roof framing type or truss configuration, so there's no federal benchmark for how common trusses are versus site-built rafters in current construction.

How to read a contractor's truss quote against this estimate

1. Is the truss count and type stated explicitly? A quote that only lists a lump-sum "roof framing package" hides whether you're being charged for 42 gable trusses or a smaller number of more expensive attic trusses.
2. Is crane rental itemized separately from the truss price? If your home is two stories and there's no crane line, ask how the trusses are being set — it should be documented, not assumed away.
3. Does the span match your actual home width? A wider-than-necessary span multiplier applied to a narrow home is an easy overcharge to catch by simply measuring the exterior wall-to-wall distance yourself.

Lead times, and why trusses are ordered before they are needed

Trusses are not a stock item. Each one is engineered and fabricated for a specific building, which means the cost this page returns is attached to a lead time that frequently matters more to a schedule than the price does.

The sequence is the thing to understand. Trusses are designed from the final framing plan, so any change to span, pitch, bearing points or a bonus room above the garage sends the drawings back for re-engineering. Changes after fabrication has begun are not adjustments; they are new trusses. This is why builders lock roof geometry earlier than almost anything else in a set of plans.

The cost consequence for a homeowner is asymmetric. Deciding to raise a pitch or add a dormer during framing is cheap on paper and expensive in practice, because the truss package is already built and the site is waiting on it. Deciding the same thing during design costs a redraw.

It also explains why truss quotes are usually firm while stick-framing quotes are usually ranges. The truss supplier is quoting a manufactured product against a drawing; the framer is quoting labour against conditions nobody has seen yet.

Trusses against stick framing, as a cost decision

The alternative to a truss package is framing the roof on site from individual rafters and ceiling joists. The two produce the same roof and very different projects.

• ·Trusses buy speed and certainty. They arrive engineered, they go up in a day or two on a typical house, and the price is fixed against a drawing before anyone is on site.
• ·Stick framing buys space and flexibility. A trussed attic is filled with webs and is not usable as living space without a specially engineered truss; a stick-framed roof can give you a room.
• ·The labour balance is the swing factor. Trusses shift cost from site labour into a manufactured product. Where skilled framing labour is scarce or expensive, that trade is strongly favourable; where it is plentiful, the gap narrows.

The decision is usually made on what you want above the ceiling rather than on price. If the attic is storage and mechanical space, trusses win on almost every axis. If it is a future bedroom, the honest comparison is stick framing against attic trusses, not against standard ones — and that is a different and much closer number.