What does sheet metal estimating include for an HVAC ductwork bid?
Sheet metal estimating covers rectangular, round, spiral and flex duct by linear feet, fittings by weight or piece, plus hangers, dampers, access doors and insulation. Each line shows its gauge, pressure class, waste factor and labor hours, priced from published U.S. wage and price data.
Our Professional Sheet Metal Estimating
Sheet metal work is priced from the drawing up: gauge, pressure class, fitting count and hanger count each drive a separate cost line. Our sheet metal estimating shows you the measurement rule behind every figure, so a reviewer can retrace a duct run from the plan to the total. We quote the fee per project after reviewing the plans, and we deliver an Excel workbook and PDF summary with marked-up drawing pages.
Sheet metal takeoff services sit at the center of that work. Every length is taken in linear feet along the duct centerline, and every fitting is counted by type and size rather than absorbed into a footage allowance.
Sheet Metal material takeoffs
We measure rectangular duct by width and height, round and spiral duct by diameter, and flex duct by installed length. Each run carries its gauge and pressure class, and each fitting, volume damper, fire damper and access door is counted as a piece. Duct insulation is taken by surface area in square feet, and hangers by count at the spacing the specification states. The deliverable is a line-item sheet in Excel with the drawing page and detail reference beside each quantity.
Sheet Metal labor cost estimates
Labor is built from the same quantities, priced in hours per item and converted to dollars with a crew rate taken from published wage data. Shop fabrication and field installation are separated, because duct built in the shop and duct assembled overhead carry different hours. Our labor cost estimates support that split with hours per fitting and per linear foot, and the estimator reviews each rate before it reaches the summary. Read this alongside our professional hvac estimating services when ductwork and equipment share one bid package.
Bid-ready sheet metal cost estimates
The final package rolls material, labor and equipment into a cost breakdown you can carry straight into a bid form. We state the AACE estimate class, list the addenda reviewed, and flag scope gaps such as missing pressure classes or unspecified hanger spacing. The PDF summary carries the marked-up pages so a reviewer can check any number against the drawing. Send your plans to start the review.
What Is Included in Our Sheet Metal Estimates?
A duct estimate is only as good as its item list, so we build the takeoff line by line and keep the arithmetic visible. Our sheet metal estimating follows the same rule for every component: the unit, the measurement rule and the source of the rate. Each line carries the SMACNA pressure class and gauge from the drawings, so a 2-inch-w.g. rectangular run and a 1-inch-w.g. return are priced as separate items rather than averaged. Where a schedule is missing, we record the assumption on the line and flag it for your review instead of filling the gap silently. The same discipline runs through our broader construction estimating services, where every division is priced on a stated rule.
| Component | Unit of measure | Measurement rule |
|---|---|---|
| Rectangular duct | lb (linear ft recorded) | Length along centerline × pounds per foot for gauge and size |
| Round and spiral duct | lb (linear ft recorded) | Length along centerline × pounds per foot by diameter |
| Fittings (elbows, tees, transitions) | each | Counted by type and size, not converted to footage |
| Duct insulation | sq ft | Surface area of the duct plus fitting allowance |
| Hangers and supports | each | Duct length ÷ specified hanger spacing, plus fitting supports |
| Volume and fire dampers | each | Counted by size and rating from the schedule |
| Access doors | each | Counted by size and panel type |
| Flex duct | linear ft | Installed length including slack at connections |
Materials, labor, equipment and cost breakdowns
Each line splits into material, labor and equipment so you can see where the money sits.
- Material: sheet steel by gauge and weight, insulation, sealant, hangers, dampers and doors
- Labor: shop hours and field hours priced separately, at a crew rate from published wage data
- Equipment: lifts, welding and cutting equipment, and shop machinery where the scope requires it
- Cost summary: extended totals, sales tax basis and a stated AACE estimate class
Copper and steel price movements feed the material lines, and the estimator reviews the final rates before release. Sheet metal labor estimating uses published wage data for sheet metal workers, with crew composition and productivity stated per line rather than buried in a lump sum. Galvanized, stainless and aluminum are priced on separate material lines because their weights per square foot and shop hours differ.
Who Needs Our Sheet Metal Estimating?
Sheet metal scope reaches several parties on one job, and each reads the numbers differently. Our sheet metal estimating output is built so the same sheet answers all of them, with the gauge, pressure class and waste factor visible on every line. Ductwork rarely sits in one place in the documents: rectangular trunk runs may be scheduled on the mechanical sheets while spiral, flex and fittings appear only in details or a schedule note. A takeoff that stops at the plan view misses those items, so we reconcile the schedules against the drawings and list what the addendum changed.
Mechanical and sheet metal subcontractors
A mechanical subcontractor bids ductwork against a plan-and-spec package and needs a fitting takeoff that matches how the shop will actually build it. We separate shop and field hours, apply the seam allowance the specification calls for, and flag pressure classes the drawings leave open. That gives the bidder a defensible number before the addendum lands, and the sheet metal estimating detail lets the shop check our fitting counts against its own cut list.
General contractors and home builders
A general contractor uses the estimate to check a subcontractor's bid and to confirm the hvac scope is complete across CSI Division 23. The line-item format shows whether volume dampers, fire dampers, insulation and access doors were carried by anyone. Missing items surface before award rather than during construction, when a fire damper omitted from the schedule becomes a change order.
Developers, architects and suppliers
Developers use the estimate for budget checks at concept and design stages, and the stated AACE estimate class tells them how much contingency to hold. Architects use the marked-up pages to see which details drove the cost, such as a stainless steel exhaust run or an acoustic liner. Suppliers use the pounds-per-foot totals to plan coil and sheet orders, and the same figures support a design-build budget before drawings are final.
Types of Sheet Metal Projects We Estimate
The gauge, pressure class and fitting density change with the building type, so the ductwork material takeoff is assembled differently for each. Our sheet metal estimating follows the same rule on every project: each line carries its unit, the measurement rule applied, and the arithmetic that produced the quantity. The pressure class from the mechanical drawings sets the gauge and the seam and reinforcement requirements, and that decision flows into every downstream line.
Residential projects
Residential ductwork is mostly light-gauge rectangular and flex duct at low pressure class, with few dampers and simple transitions. The count is high but the fitting density is low, so length and register counts drive the total. Waste factor is applied to the sheet goods and stated on the line. Flex runs are measured in linear feet along the installed path, and boots and register boxes are counted by size rather than measured.
Commercial buildings
Commercial work brings medium and high pressure classes, heavier gauge, spiral duct, fire dampers and access doors at rated assemblies. Fitting counts rise sharply, and hanger spacing follows the specification rather than a default. The estimate separates shop-fabricated straight runs from field-assembled fittings, and rectangular duct is taken off by perimeter and length so pounds per foot can be applied. For the bid itself, our bid estimating services carry the same line structure into the pricing sheet.
Industrial and infrastructure projects
Industrial duct may be stainless or aluminum rather than galvanized steel, with welded seams, heavier gauge and supports designed for the process load. The takeoff tracks alloy, weld length and support steel as separate items. For the broader mechanical package, see our professional construction estimating services.
Our Sheet Metal Estimating Process
Sheet metal pricing fails at the takeoff, not at the markup. A duct run measured in linear feet without the fitting weights behind it, or a gauge called out against the wrong pressure class, produces a number that cannot survive the first addendum. We work the drawings in a fixed order so each figure can be traced back to a sheet, a detail or a specification paragraph, and every line in the quantity takeoff carries the sheet reference it came from.
We price ductwork alongside the equipment it serves, so the duct static, terminal selection and insulation scope stay consistent. Where a project mixes trades in one mechanical package, our hvac estimating services cover the equipment and controls that sit around the sheet metal scope. Labor is built the same way as material: hours by item, extended at a crew rate, so the labor cost estimates reconcile line by line with the duct quantities.
Submit drawings and specifications
Send the architectural, mechanical and structural sheets together with the Division 23 specification sections and every addendum issued to date. We log the drawing dates and revision numbers on receipt, because a sheet metal takeoff built on a superseded plan is the most common source of a lost bid. Tell us the duct pressure class, the seal class and any owner standards that override the base specification.
Plan review and digital takeoff
The estimator reviews each sheet for rectangular, round duct and spiral runs, then measures centerline lengths and records every fitting as a separate item with its own weight. Galvanized steel gauges are read against the SMACNA pressure class table rather than assumed from a note. We count volume dampers, fire dampers, access doors and hangers individually, and we flag any detail that conflicts with the schedule before pricing begins.
Cost calculation, quality checks and delivery
Material quantities are extended at current unit costs, then sheet metal labor estimating hours are applied by item and crew rate. A second estimator checks the gauge assignments, the fitting counts and the seam and waste allowances against the drawing set. You receive an Excel workbook, a PDF summary and marked-up drawing pages showing where each quantity came from. The fee is quoted per project after we review the plans, and delivery dates are agreed when the scope is confirmed.
Sample Sheet Metal Estimate and Deliverables
The worked example below is illustrative and uses assumed quantities, assumed unit costs and a 10% waste allowance on rectangular duct only. It is not a quote and does not reflect current market prices. The purpose is to show how a line item is built: quantity, unit, unit cost range, extended range, then a total that a reviewer can re-add by hand.
For an hvac sheet metal bid estimate, the fitting weights and the field installation hours usually decide the outcome, not the straight duct. A run of spiral duct prices differently from rectangular because shop fabrication time per pound is lower and the hanger spacing changes. Stainless steel in a kitchen hood or laboratory exhaust carries a material premium and a separate weld and passivation allowance that never appears on a galvanized line, which is why sheet metal estimating separates those lines before any total is struck.
| Item | Qty | Unit | Unit cost range | Extended range |
|---|---|---|---|---|
| Rectangular galvanized duct, 24x12, 24 ga | 1,000 | lb | $2.10 – $2.60 | $2,100 – $2,600 |
| Rectangular duct waste allowance, 10% | 100 | lb | $2.10 – $2.60 | $210 – $260 |
| Spiral duct, 12 in dia, 24 ga | 400 | lf | $14.00 – $18.00 | $5,600 – $7,200 |
| Fittings, rectangular, 24 ga | 1,200 | lb | $4.50 – $6.00 | $5,400 – $7,200 |
| Volume dampers, 12x12 | 12 | ea | $85 – $120 | $1,020 – $1,440 |
| Fire dampers, 24x12, 1.5 hr | 6 | ea | $210 – $290 | $1,260 – $1,740 |
| Hangers and supports | 1,000 | lb | $0.55 – $0.75 | $550 – $750 |
| Total, illustrative | $16,140 – $21,190 |
Excel quantity takeoff sheet
One row per item, with the drawing sheet reference, the measurement rule used and the unit of measure stated in the row. Rectangular duct is measured by centerline linear feet and converted to pounds per foot by gauge; fittings are listed individually. Formulas stay live so you can change a waste factor or a unit cost and see the total move.
Marked-up drawings
Each duct run, fitting, damper and hanger is highlighted on the plan with a tag that matches the takeoff row number. Quantities that were excluded, such as duct insulation by others or flex duct at terminal connections, are clouded and labeled so the scope boundary is visible to your reviewer.
Itemized cost estimate
Material, labor hours, crew rate and equipment are shown on separate columns rather than blended into a single price. Indirect costs and markup are added as their own lines, so you can test the estimate against your own bid strategy. The PDF summary repeats the assumptions page that governs every number in the workbook.
Software and Pricing Data We Use
A sheet metal estimating sheet is only as good as the price behind each row. We separate the quantity from the price so both can be audited: the takeoff states what the drawing shows, and the pricing column states which wage or material index was applied and on what date.
The chart below tracks the Producer Price Index series for the materials in this scope, rebased to 100 so the movements are comparable across steel, copper and plastic products. Read it as a direction of travel, not as a forecast for a single project.
Takeoff and estimating software
Quantities are pulled on-screen from the PDF drawing set, with the scale calibrated per sheet and every measurement saved to a markup layer. Those quantities flow into a spreadsheet estimating model where each line carries its unit, measurement rule and waste factor. Cost databases supply the base unit costs, and aluminum, flex duct and stainless items are priced from separate assemblies rather than forced into a galvanized rate.
Regional material and labor pricing method
Sheet metal estimating starts from national average unit costs, adjusted with published U.S. Bureau of Labor Statistics wage data and Producer Price Index movements, then a location factor for the project city and a condition factor for occupied-space or high-rise work. The wage table below shows the trades that drive mechanical packages, including sheet metal workers. Prevailing wage projects are priced against the applicable determination, and the estimator reviews every adjusted rate before the workbook is released.
Material price movement, Oct 2023 to Sep 2026
| Occupation | 25th percentile | Median | 75th percentile |
|---|---|---|---|
| Sheet metal workers | $22.99 | $29.71 | $39.24 |
| HVAC mechanics and installers | $23.25 | $29.33 | $37.05 |
| Construction laborers | $18.57 | $22.66 | $28.72 |
Base wages before payroll taxes, insurance and benefits. Source: BLS Occupational Employment and Wage Statistics, national, all industries.
Why Contractors Choose Our Estimating Services
Every number in our workbook can be traced to three things: the drawing it came from, the measurement rule applied, and the public data source behind the price. That traceability is what lets a reviewer challenge a line and get an answer instead of a shrug. Our professional construction cost estimating services apply the same discipline to every scope we price, including the sheet metal package.
We estimate the sheet metal scope as a package, not as isolated duct lengths. A galvanized ductwork takeoff that ignores the equipment it connects to will miss transitions, offsets and the flex duct at terminal boxes. Our hvac and duct takeoff services keep those connections inside the same measured scope, and the same line-by-line backup carries into our professional bid estimating services when the package goes out to bid.
Trade-specific expertise
Duct is priced by gauge and pressure class against SMACNA tables, with fitting weights taken from the same standard rather than estimated by rule of thumb. Duct insulation is measured by surface area and priced separately from the metal, and fire and smoke damper locations are checked against the rated wall and floor plans. Line items follow CSI Division 23 in MasterFormat numbering so your reviewer can match them to the specification.
Quality control and clear assumptions
A second estimator checks gauge assignments, fitting counts, hanger spacing and waste factors before the workbook is released. An assumptions page records what was included, what was excluded and which drawing revision was used. If a specification is silent on seal class or reinforcement, we state the assumption we priced rather than hiding it in a unit rate.
Turnaround, communication and revisions
Delivery dates are agreed when the scope and drawing set are confirmed, and the schedule is stated in writing with the estimate. Questions during the takeoff go to one named estimator rather than a shared inbox. Revisions are handled against the addendum or revised sheet that triggered them, so you can see exactly which quantities changed and by how much. To start, send your plans with the specification sections and current addenda.
Sheet Metal Estimating Pricing
We quote a fixed fee per project after an estimator has read the plans and specifications. The fee follows the work, not a page count: a 40-sheet set with 60 duct layouts and a full Division 23 schedule takes more reading than a 120-sheet architectural set with two mechanical sheets. Every sheet metal estimating services usa client gets the same rule — we price the scope we can verify, and we flag scope we cannot. If an addendum lands before the bid date, send it and we re-price the affected duct runs rather than the whole set. Start with send your plans and we will confirm what the drawings support.
How quotes are calculated
The quote is built from the scope we measure: linear feet of rectangular, round and spiral duct by size and gauge, fitting counts, and the accessories that carry their own labor — volume damper, fire damper, access door, turning vanes and test ports. We multiply measured quantities by unit costs and labor hours, then apply the crew rate for the trade. The calculator below returns a loaded rate from base wage, burden, overtime share, crew size and hours; use it to test the wage side of a bid before our line items arrive. The estimate itself is classified to an AACE estimate class so you know how much design detail stands behind each number.
What affects price and delivery time
Scope drives the fee: sheet count, the number of trades in the set, alternates, addenda and the density of duct pressure class callouts all move the reading effort. A design-build set with performance specs and no duct schedule takes longer than a plan-and-spec set with every size and gauge noted. Delivery time is confirmed with the quote — we do not publish a turnaround figure because it depends on the same variables. Tell us the bid date when you send the drawings, and we will say whether the date is workable before you commit.
Loaded labor rate calculator
- Loaded rate
- $40/hr
- Blended with overtime
- $42/hr
- Labor hours
- 320
- Crew labor cost
- $13,476
Burden covers payroll taxes, workers’ compensation, insurance and benefits; it varies by state, trade and company. Overtime is priced at time and a half.
Sheet Metal Estimating Across the US
Wage levels set the largest regional spread in a sheet metal bid. A crew rate built on the national median for sheet metal workers will underprice work in a high-wage metro and overprice it in a low-wage one, so we adjust labor to the project's location rather than the office's. Public work adds a second layer: prevailing wage determinations raise the base rate and change the burden, and we ask for the wage decision up front on any federally funded job. The wage table below shows the national medians we start from.
Related work we price the same way: construction estimating services.
| Trade | BLS OEWS 2025 national median hourly wage | Where it appears in a ductwork estimate |
|---|---|---|
| Sheet metal workers | $29.71 | Duct fabrication and installation, hangers, accessories |
| HVAC mechanics and installers | $29.33 | Equipment setting, refrigerant and controls tie-in |
| Plumbers, pipefitters and steamfitters | $30.67 | Hydronic piping, steam and condensate in mechanical rooms |
| Electricians | $30.38 | Power to air handlers, VAV boxes and controls |
Frequently Asked Questions
How much does a sheet metal estimate cost?
The fee is quoted per project after we review the plans, so it depends on drawing count, duct scope, and how many pressure classes and systems the sheets cover. A single-zone rectangular duct package prices differently from a full Division 23 package with spiral, double-wall, and fire damper schedules. Send the drawings and spec sections and we return a written quote before any takeoff begins.
How long does a sheet metal takeoff take?
The delivery date is set by sheet count, the number of duct systems, and how complete the fitting schedules are, and we confirm it in the quote rather than before. Drawings with legible CFM, pressure class, and gauge notes move faster than sheets where those values must be derived from a schedule. Addenda issued after we start reset the date, so send the final set.
Do you estimate labor and material costs?
Yes. Every sheet metal estimating package carries both sides: pounds and linear feet of galvanized, stainless, and aluminum duct with fittings and accessories, and labor hours by item converted at a crew rate. We show the unit, the measurement rule, and the arithmetic so you can check any line. Wage data from the U.S. Bureau of Labor Statistics sets the labor basis and is reviewed by an estimator.
What drawings do you need?
Send the mechanical plans and schedules, the spec sections covering Division 23, the equipment schedule, and any addenda, in PDF. Reflected ceiling plans help where duct routes are tight, and a control-area or smoke-damper plan resolves damper counts. If gauge or pressure class is only in the spec, send that section; we will not guess a gauge that changes the weight.
Can you use my estimate template?
Send the template with the plans and we confirm whether the estimate can be delivered in it. Most workbooks map cleanly when the columns are item, description, unit, quantity, material cost, labor hours, and total. Heavily formula-linked templates or ones with locked cost codes may need a companion sheet. We tell you which before the quote is issued.
Do you sign NDAs?
Clients can request an NDA before sending drawings, and the terms are agreed before plan review starts. Send the document with your initial inquiry so the review and the agreement happen in the same step. We do not publish a standard NDA policy; the terms are whatever both parties sign for that project.
Do you produce a ductwork material takeoff in pounds as well as linear feet?
Yes. Rectangular duct is taken off by linear feet per size and converted to pounds per foot using gauge and sheet thickness, while spiral and round run by diameter and length. Fittings are counted individually because a 24x12 radius elbow and a square throat elbow at the same size carry different weights. Both views appear on the takeoff so the shop and the bid use the same numbers.
How do you handle duct insulation and liners in the takeoff?
Insulation is taken off by area in square feet, not by duct length, because the wrap follows the perimeter of each size and adds to the fitting surface. Internal liner is measured on the same rule and carries its own labor item. We list the thickness and facing from the spec so the bid matches what the mechanical scope requires.
Do you count hangers, dampers, and access doors?
Yes, as separate line items. Hangers are computed from hanger spacing rules applied to each duct run, so a long rectangular run yields a count rather than an allowance. Volume dampers, fire and smoke dampers, access doors, and test ports come off the schedules and plan symbols, and any symbol without a schedule entry is flagged as a question.
Can you estimate a design-build sheet metal package without a full spec?
We can, but the takeoff then rests on assumptions you must approve. Where gauge and pressure class are not stated, we list the assumed values on a basis-of-estimate page so the number is traceable to a stated rule. Design-build packages usually need a second pass once the engineered drawings arrive.
What SMACNA pressure class do you use for duct gauge?
We use the pressure class shown on the drawings or in the spec, typically 1-inch, 2-inch, 4-inch, or 10-inch water gauge, and apply the corresponding SMACNA gauge table for the duct size. Where the class is missing, we ask rather than default, because a step in gauge changes both weight and labor. Confirm the edition your spec cites with the designer.
Do you separate shop fabrication from field installation labor?
We can split the labor hours into shop fabrication and field installation when your bid needs that breakdown. Fabrication hours track the fitting count and seam length; field hours track hanger count, joint length, and access difficulty. Keeping them apart lets you compare your own shop rate against the estimate instead of one blended number.
Can you price a sheet metal job in a state outside yours?
Yes. We work nationally and adjust the labor basis with published wage data for the project location rather than applying one national rate. Material pricing follows published producer price movement for steel mill products, copper, and plastic construction products, then an estimator reviews the result. State the project city and ZIP on the request.
How do you handle addenda and revised drawings?
Send each addendum with a date and we log which sheets it changes before re-running the affected takeoff. Revised duct sizes or a new pressure class can ripple into gauge, weight, hanger count, and insulation area, so the whole affected run is recalculated. The estimate notes the drawing revision it was built from.