Roof Truss Cost Calculator

Roof trusses typically cost $120 to $400+ per truss for the trusses themselves (supply), and most residential truss packages run $5,000 to $20,000 including delivery and installation. A small home or garage might be $5,000–$10,000, while a large home or one with complex attic trusses can exceed $20,000–$35,000+. The cost is driven by the number of trusses (based on roof length, since they sit ~24 inches apart), the span each truss covers (a small ≤24 ft span is cheapest, 24–36 ft is typical, and 36–50+ ft costs the most), the truss type (standard/fink is the baseline; scissor/vaulted and attic/room-in-attic cost more), and the material and load rating (standard lumber vs. heavy-load/snow-rated vs. treated or steel). A ~$1,000 project minimum applies. Add crane and installation labor, delivery, bracing and hardware, and engineering on top. Enter your truss count and span above for a localized estimate.

They're two ways to frame a roof. Trusses are prefabricated, engineered triangular frameworks — top chords, a bottom chord, and interior webs joined by metal connector plates — built in a factory to your building's design, delivered, and lifted into place (usually by crane). Rafters are individual sloped beams cut and assembled on-site by carpenters (stick framing). Trusses win on speed (they're set in days, not weeks), cost (efficient factory production and less skilled on-site labor), and span — they can clear long distances without interior load-bearing walls, freeing up the floor plan below. Their downside is that the webs fill the attic, limiting storage unless you use attic trusses. Rafters win on open attic space, vaulted ceilings, and on-site flexibility for custom or complex roofs, but they cost more in labor and time. Trusses are the dominant modern choice for most homes; rafters suit custom architecture or when you want an open, usable attic. This calculator prices trusses.

As a rule of thumb, you need about one truss every 2 feet of roof length, since residential trusses are most commonly spaced 24 inches (2 ft) on center. So take the roof length in feet, divide by 2, and add one for the starting truss — a 40 ft long roof needs about 21 trusses (40 ÷ 2 + 1), and a 60 ft roof about 31. Some designs use tighter 16-inch spacing for heavier snow loads or specific requirements, which increases the count. Note that the roof length drives the count, while the building width drives the span (truss size), not the number. Gable end trusses at each end are part of the total. This quick estimate works for a simple gable roof; complex roofs with hips, valleys, dormers, or multiple sections need a truss layout from the manufacturer for an exact count. Use the estimate to enter a number above, then confirm with a designed layout when you order.

They're two specialty truss types that do what a standard truss can't — create usable space or a vaulted ceiling. A standard (fink) truss has webs filling the triangle, which makes it strong and cheap but leaves only a web-filled attic and a flat ceiling below. An attic truss (room-in-attic) is designed with a clear, open space in the center — the bottom chord forms a room floor and the webs are configured around the opening — creating a bonus room or generous storage within the roof itself, a cost-effective way to gain square footage without a full addition. A scissor truss slopes the bottom chord upward instead of running it flat, producing a vaulted/cathedral ceiling below with the efficiency of trusses (no site-built rafters needed). Both cost more than standard trusses because the design must carry the load around the open or vaulted space, requiring larger members and more engineering — this calculator adds about 20% for scissor/specialty and 30% for attic trusses. Choose them to gain attic rooms or dramatic ceilings.

Yes to both, but they're handled differently. The trusses themselves come engineered: the manufacturer's engineers design each one to carry the required dead, live, snow, and wind loads for your building per code, specifying the lumber sizes, web layout, and connector plates, and they provide stamped, sealed truss drawings as part of the package — you don't design them yourself. Separately, the building the trusses go into needs a building permit, and the roof truss layout plus the engineered truss drawings are part of the permitted plans that the building official reviews. The installation is then inspected for correct placement, connections, and — critically — bracing. Proper temporary and permanent bracing is essential: inadequate bracing during installation is a known cause of truss collapse, which is why professional installation and the right hardware matter. This calculator includes engineering/stamp and bracing/hardware add-ons, though the engineering stamp is often bundled with the truss order.

The span is the width each truss covers from wall to wall, and it's a major cost driver because a longer span has to carry the roof load over a greater distance without interior support. To do that safely, longer-span trusses need larger and stronger chord members, more webs, and more engineering — so material and design cost climb with the span. A short span (up to 24 ft), typical of garages and small homes, is the cheapest per truss (~$120 in this model); a medium span (24–36 ft) suits most homes (~$200); and a large span (36–50+ ft) for wide or open-plan homes is the most (~$320). The span also interacts with the truss type and load rating — a long-span attic truss carrying a heavy snow load is far more expensive per piece than a short-span standard truss. Because the span sets the per-truss base rate, getting your building width right is as important as counting the trusses.

The trusses are only part of the total — several services turn a stack of delivered trusses into a finished roof structure. Delivery/freight gets the (large, awkward) trusses to your site (~$800). A crane plus installation labor lifts and sets them, which is how trusses are almost always installed on a home (~$2,500) and a big reason trusses go up so fast. Bracing and connectors/hardware secure the trusses to the walls and to each other — permanent and temporary bracing is a safety essential, not optional (~$700). Engineered design/stamp provides the sealed drawings (~$600, often already included with the order). Gable end trusses close off each end of the roof (~$500). And custom design modifications cover non-standard configurations for hips, dormers, or unusual layouts (~$400). When comparing quotes, check whether delivery, crane/install, and bracing are included in the per-truss price or billed separately — it changes the bottom line significantly.

Setting the trusses is fast — usually 1 to 3 days for a typical home (sometimes a single day for a small, simple roof), because prefabrication means there's no cutting or assembly on site; the crew just cranes each truss into place, spaces it, secures it to the walls, and braces it. Larger or complex roofs with hips, valleys, and many trusses take longer. But the full timeline is longer than the install: after you provide building plans, the manufacturer designs and engineers the truss layout (a few days to a couple of weeks), then manufactures the trusses to order — and that manufacturing lead time, often several weeks depending on the shop's backlog, is usually the longest part. So order trusses well in advance. Installation is also weather-dependent, since trusses aren't set in high winds for safety. In short: plan for weeks of design and manufacturing lead time, then enjoy a quick 1–3 day installation.