TJI floor joists typically cost $2-$6 per linear foot for materials, while a professionally framed floor often totals $8-$16 per square foot. A 1,000-square-foot floor may therefore run about $8,000-$16,000 before unusual access, demolition, engineering, or finish work. Joist depth, span, spacing, labor rates, and the condition of the existing structure drive the quote.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| TJI joist material | $2/linear ft | $4/linear ft | $6/linear ft | Varies by depth, series, and supplier |
| Installed floor framing | $8/sq ft | $12/sq ft | $16/sq ft | Typical new framing, ordinary access |
| 1,000-sq-ft project | $8,000 | $12,000 | $16,000 | Joists, labor, and standard accessories |
| Existing-floor repair | $1,500 | $4,000 | $10,000+ | Depends on access and damage extent |
What TJI joists cost for a typical framed floor
For a new floor with standard engineered wood I-joists, plan on roughly $8-$16 per square foot installed. A 500-square-foot area may cost $4,000-$8,000; 1,500 square feet may cost $12,000-$24,000. The average example is a straightforward 1,000-square-foot floor, with ordinary access and no major structural redesign.
Material pricing is often quoted by linear foot, but joists are purchased in specified lengths and depths. At 16 inches on center, a 1,000-square-foot rectangular floor may need around 750 linear feet before waste, blocking, and rim board. For an early budget, $12 per square foot is a useful midpoint, not a fixed national price.
Assumptions: standard residential floor, common joist depth, typical U.S. labor, normal access, and no finish flooring included.
How joists, labor, and rim board shape the quote
Quotes can differ in what they include. Confirm whether the price covers delivery, hangers, blocking, rim board, subfloor, demolition, and disposal. The table shows typical allowances for a 1,000-square-foot new framing job; local bids may combine these line items.
| Cost component | Typical range | Pricing basis | What changes it |
|---|---|---|---|
| TJI joists | $1,500-$4,500 | $2-$6/linear ft | Depth, series, length, spacing |
| Rim board, blocking, hangers | $800-$2,500 | Per floor or connection | Perimeter and connection details |
| Installation labor | $3,000-$7,000 | $50-$100/hour per worker | Crew size and site access |
| Delivery and waste | $300-$1,200 | Per order | Distance, unload needs, cutoffs |
Labor can be estimated with . A two-person crew working 20-40 hours at a combined $100-$180 per crew-hour would represent $2,000-$7,200 in labor, before contractor overhead or other trades. Ask for quantities and included materials rather than comparing totals alone.
Span, depth, and spacing change TJI pricing
Longer spans generally require deeper or stronger joists, closer spacing, or added beams. Moving from 16 inches to 12 inches on center uses about one-third more joists, increasing material and installation time. A 9-1/2-inch joist may suit a shorter span, while 14- or 16-inch products can be specified where greater span or stiffness is needed.
Actual selection must follow manufacturer span tables and the project’s load requirements; joist depth alone does not establish capacity. Heavy tile, a concentrated load, or a long open room can require engineering or a supporting beam. A span above roughly 18-20 feet deserves careful design review, since the framing solution may cost more than standard joist pricing suggests.
Regional labor and supply conditions also matter. Dense urban markets may run 10%-25% above typical pricing, while rural locations can face higher delivery charges or limited supplier choice. Quotes may also rise when material must be special-ordered.
Existing-floor repairs cost more when access is tight
Replacing one or two accessible joists may cost $1,500-$4,000, including opening the floor or ceiling, temporary support, installation, and basic patching. Repairs affecting several joists or requiring finished-floor removal can reach $4,000-$10,000 or more. Water damage, plumbing conflicts, and sagging walls can expand the work beyond the joists themselves.
Demolition and disposal may add $500-$2,500, depending on the amount removed and local hauling fees. A structural engineer may charge about $500-$1,500 for a site visit and repair details. Identify whether the quote includes temporary shoring, finish restoration, and permits before treating a repair estimate as complete.
Three floor-framing quotes with different scopes
A 400-square-foot addition with 11-7/8-inch joists at 16 inches on center might require about 300 linear feet. At $3-$5 per foot, joists cost $900-$1,500; accessories, delivery, and 24-32 labor hours can bring framing to roughly $4,000-$7,000.
A 1,000-square-foot open-plan floor using 14-inch joists and a longer span could require $3,000-$5,500 in joists, plus $4,000-$7,000 labor and $1,500-$3,000 for rim board and connectors. A reasonable total is $9,000-$15,500, excluding subfloor and finish flooring.
A 600-square-foot repair involving four damaged joists may take 20-35 labor hours, with materials around $500-$1,500. If ceiling removal, shoring, and patching are needed, the total can reach $3,500-$8,000. These examples show why square footage alone does not make repair and new construction bids comparable.
Installation hours depend on delivery and framing access
A clear, open 1,000-square-foot floor may take a small crew about two to four workdays for joists, rim board, and blocking. Tight stair access, upper-floor delivery, unusual cuts, or coordination with plumbing and electrical work can extend the schedule. Contractors may charge a minimum mobilization fee of $300-$800 for small jobs.
Delivery may be priced separately, commonly $150-$600 locally and more for long-distance or specialized unloading. Confirm who unloads and stages joists, because waiting time or a second delivery can add labor and transport fees.
Repairing damaged joists versus reframing the floor
When damage is limited, a designed sister joist or localized replacement may cost less than replacing an entire floor system. Sistering can run about $300-$800 per joist when access is open, but concealed rot or inadequate bearing may require a broader repair. It is not appropriate to cover structural damage without identifying its cause.
Full replacement is more likely when many joists are damaged, the floor is badly out of level, or the layout is changing. Get a written repair scope from a qualified contractor or engineer before comparing a small repair price with a full reframing quote.
Where a TJI framing budget can be reduced safely
Keep the layout and span within the engineered design where possible, and avoid specifying deeper joists or tighter spacing without a structural reason. Ask the designer or supplier to compare approved joist series and lengths; material savings may be possible without changing the required capacity. Ordering accurate quantities also limits costly leftovers and extra delivery runs.
Clear access and remove nonstructural obstacles before the crew arrives only when the contractor approves the work. Compare at least three itemized bids using the same joist depth, spacing, subfloor scope, and disposal assumptions. Do not cut costs by reducing bearing, connectors, or structural capacity; those details affect safety and code compliance.