Mechanical estimating services produce a priced quantity takeoff for HVAC, piping, and plumbing systems so you can bid the full mechanical package without counting shared scope twice. You send the bid set — mechanical drawings, specifications, schedules, and addenda. We return a line-item estimate organized by CSI MasterFormat division, with quantities extended and material and labor pricing adjusted to your ZIP code. As a mechanical estimating company, we work from the same documents your chief estimator would use, including the equipment schedules and the control sequence of operation.
- Deliverable
- Excel estimate + marked-up PDF plans
- Organized by
- CSI MasterFormat section
- Turnaround
- 24–48 hours for most projects
- Pricing
- ZIP-code-adjusted material and labor pricing
- Software
- Bluebeam Revu, PlanSwift, RSMeans data
We take off the whole mechanical scope together because the systems share real estate and supports. Pipe racks, sleeves, hangers, and controls interfaces belong to more than one sub. When HVAC, piping, and plumbing are taken off separately, those items either get counted twice or dropped between trades. Our takeoff assigns each shared item once and notes the responsible division. If you need only one trade, we also provide HVAC estimating services, piping estimating services, and plumbing estimating services as standalone scopes.
The deliverable is an Excel workbook and PDF with quantities by system, size, and material. We mark up the plan set with color-coded highlights for duct, pipe, and equipment so you can trace every number back to the drawing. Turnaround is 24–48 hours for most projects, with rush available. For projects that include electrical and controls, see our MEP estimating services page. If you are preparing a bid, get an estimate and we will confirm what we need from the bid set.
What our outsourced mechanical estimating covers
We take off Divisions 21, 22, 23, and 25 from the mechanical, plumbing, and controls drawings. Quantities are separated by system, size, and material so you can price with your own labor rates or ours. Shared items are assigned once with a note on which trade carries them.
Ductwork Takeoff
Rectangular, spiral, and flex duct measured by gauge and size, including dampers, access doors, and air devices.
LB · SF · LF · EAHydronic Piping
Sch. 40 and Sch. 80 black steel for heating and condenser water, with valves, fittings, and insulation by thickness.
LF · EA · SFPlumbing Rough-In
Type L copper domestic water and DWV cast iron or PVC drainage, plus fixtures and trim-out by schedule.
LF · EAEquipment Setting
Rooftop units, split systems, air handlers, fan coils, chillers, boilers, and pumps with pads and starters.
EA · TON · MBHValves & Specialties
Gate, globe, check, and balance valves counted by size and service, with strainers and flow meters.
EA by sizeInsulation & Hangers
Pipe and duct insulation by thickness and service, plus clevis hangers, trapeze assemblies, and supports.
SF · LF · EAControls Interface
Control valves, sensors, and interface points coordinated with the electrical division to avoid scope gaps.
EA · POINTSTesting & Balancing
TAB allowance and duct leakage testing priced as a line item, not buried in equipment or labor.
LS · LFWhat every mechanical estimating takeoff includes
- Sch. 40 and Sch. 80 black steel pipe for heating and condenser water, LF by diameter
- Type L copper domestic water and Type DWV cast iron or PVC drainage, LF by diameter
- Rectangular duct 24 ga through 16 ga, LB and SF of sheet metal
- Spiral and flex duct runs, LF by diameter
- Volume dampers, fire/smoke dampers, and access doors, EA
- Supply, return, and exhaust air devices, EA
- Gate, globe, check, and balance valves, EA by size
- Rooftop units, split systems, air handlers, and fan coils, EA
- Chillers, boilers, and pumps with pads, vibration isolation, and starters
- Pipe and duct insulation by thickness and service, SF or LF
- Hangers, clevis supports, and trapeze assemblies, EA or LF
- Test, adjust, and balance allowance and duct leakage testing
How our mechanical estimator performs a construction takeoff
- Review drawings and specsWe read the mechanical plans, schedules, and specifications to identify system types, materials, and code requirements. We note the adopted code edition and any local amendments that affect seismic bracing, insulation, or ventilation rates. Discrepancies between plans and specs are logged for your review before takeoff. For example, if the schedule calls for 2-inch pipe but the plan shows 1-1/2 inch, we flag it for your decision. This step ensures the takeoff reflects the correct scope and avoids surprises during bid review.
- Measure duct and pipe runsUsing Bluebeam Revu and PlanSwift, we measure centerline lengths of duct and pipe by size and material. Rectangular duct is measured by length and converted to pounds using gauge and dimension. Spiral and flex duct are measured by run length. Fittings are counted at each change in direction or size. We also note transitions, offsets, and drops to equipment, which are often missed in manual takeoffs. Measurements are recorded by sheet number so you can trace each quantity back to the drawing.
- Count equipment and specialtiesWe count air handlers, chillers, boilers, pumps, rooftop units, and fan coils from the schedules and plans. Each item is tagged with capacity, curb dimensions, and required accessories. Valves, dampers, air devices, and controls points are counted by type and size. We cross-check the equipment schedule against the plan to catch units shown on one but not the other. Accessories like vibration isolators, flexible connections, and drain pans are included as separate line items so you can see exactly what is covered.
- Apply insulation and supportsInsulation is measured by surface area or length, with thickness taken from the spec. Hangers and supports are counted based on spacing required by code and manufacturer instructions. Seismic bracing is added where the adopted code requires it, with a note to confirm with the local building department. We also include insulation at fittings, valves, and equipment, which is often overlooked. Supports are separated by type—clevis, trapeze, riser clamps—so you can price them accurately with your own labor rates.
- Price with ZIP-adjusted ratesMaterial and labor pricing is adjusted to your ZIP code using RSMeans data. We separate material, labor, and equipment costs so you can apply your own markup and labor rates. Waste factors are applied as separate lines, typically 5–10% for pipe and 10–15% for duct. We also note any items that are quoted rather than priced from a database, such as specialty equipment or controls. This transparency lets you adjust the estimate to match your actual buying power and labor agreements.
- Mark up plans and deliverWe highlight duct, pipe, and equipment on the plan set with color-coded markup. The final Excel workbook and PDF are organized by CSI MasterFormat division, with quantities, units, and references to the sheet where each item was measured. Rush delivery is available for bid dates. The marked-up plans serve as a visual audit trail, so you can quickly verify that all scope has been captured. We also include a summary tab with totals by system and a list of assumptions and exclusions.
What we need from you
- Mechanical drawingsPlan sheets showing duct routing, pipe routing, equipment locations, and schedules. PDF is preferred.
- SpecificationsProject manual with Division 21, 22, 23, and 25 sections. We need material types, insulation thicknesses, and controls scope.
- AddendaAny addenda issued before bid date. These often change equipment sizes or routing and must be incorporated.
- Bid dateYour deadline so we can schedule turnaround. Rush is available for short turnarounds.
- ZIP codeProject ZIP code for material and labor pricing adjustments.
- Scope notesAny specific inclusions or exclusions you want reflected, such as controls by others or TAB by others.
Sample mechanical takeoff
This excerpt shows how we present quantities by CSI section with a reference to the drawing sheet. Quantities are illustrative for a mid-size commercial project.
| Section | Line item | Qty | Unit | Ref. |
|---|---|---|---|---|
| 23 31 00 | Rectangular duct, galvanized, 24 ga, 24×12 in | 1,250 | LF | M-201 |
| 23 31 00 | Spiral duct, galvanized, 12 in dia | 840 | LF | M-202 |
| 23 31 00 | Flex duct, insulated, 8 in dia | 2,100 | LF | M-203 |
| 23 33 00 | Volume damper, 12×12 in | 48 | EA | M-204 |
| 23 37 00 | Ceiling diffuser, 24×24 in, aluminum | 96 | EA | M-205 |
| 23 64 00 | Air-cooled chiller, 200 ton | 2 | EA | M-301 |
| 23 73 00 | Air handling unit, 20,000 CFM | 4 | EA | M-302 |
| 23 07 00 | Duct insulation, 1-1/2 in thick, R-6 | 12,500 | SF | M-401 |
| 23 21 13 | Sch. 40 black steel pipe, 4 in dia | 1,800 | LF | M-501 |
| 23 21 13 | Gate valve, 4 in, flanged | 12 | EA | M-502 |
| 23 22 13 | Steam trap, 1/2 in, thermostatic | 24 | EA | M-503 |
| 23 05 93 | Test, adjust, and balance | 1 | LOT | M-601 |
Units of measure we use
Every quantity is reported in the unit the trade buys and installs. We do not convert to a lump sum unless you ask.
| Item | Unit | How it's measured |
|---|---|---|
| Black steel pipe | LF | Centerline length by diameter, with fittings counted separately as EA |
| Copper water pipe | LF | Run length by diameter, Type L or M, excluding fittings |
| Cast iron drainage | LF | Hub-to-hub length by diameter, with couplings as EA |
| Rectangular duct | LB | Sheet metal weight by gauge and size, plus SF of surface area |
| Spiral duct | LF | Run length by diameter, with fittings as EA |
| Flex duct | LF | Fully extended length by diameter, including slack |
| Air devices | EA | Count of diffusers, registers, and grilles by neck size |
| Valves | EA | Count by type and size, with operator type noted |
| Equipment | EA | Count of units with capacity in tons or MBH |
| Insulation | SF | Surface area by thickness and service, including jacketing |
| Hangers | EA | Count by type and size, or LF of trapeze |
| TAB | HR | Estimated hours based on system count and complexity |
Worked example: takeoff of a single-zone VAV air handling unit and duct run
This example shows how we take off one air handling unit and its associated ductwork. Dimensions and quantities are illustrative only. We follow the same steps for every system on your project.
Step 1 – Identify the AHU and its capacity.
From the schedule: AHU-1, 20,000 CFM, 400 MBH heating, 200 MBH cooling. Count: 1 EA. Include accessories: vibration isolators (4 EA), flexible duct connections (2 EA), condensate drain pan with float switch (1 EA).
Step 2 – Measure supply duct from AHU to first branch.
Plan shows 40 LF of 24×12 in rectangular duct, 24 ga. Convert to pounds:
- Surface area per LF = 2 × (24 + 12) / 12 = 6 SF/LF.
- 40 LF × 6 SF/LF = 240 SF.
- Weight: 24 ga galvanized steel weighs 1.156 lb/SF.
- 240 SF × 1.156 = 277 LB.
Add 10% waste for fittings and offcuts: 277 × 1.10 = 305 LB. Waste is a separate line.
Step 3 – Count fittings and dampers.
- 90° elbows: 4 EA (24×12 in).
- Volume damper: 1 EA (24×12 in).
- Takeoff: 1 EA (24×12 in).
- Flex duct connection: 1 EA (24×12 in to 20 in dia).
Step 4 – Measure branch duct and air devices.
- Spiral duct 12 in dia: 60 LF.
- Flex duct 8 in dia: 120 LF.
- Ceiling diffusers 24×24 in: 8 EA.
- Volume dampers 12 in dia: 4 EA.
- Flex duct dampers 8 in dia: 8 EA.
Step 5 – Insulation.
- Duct wrap 1-1/2 in thick, R-6: measure external surface area.
- For 24×12 duct: 40 LF × 6 SF/LF = 240 SF.
- For 12 in spiral: 60 LF × 3.14 SF/LF = 188 SF.
- For 8 in flex: 120 LF × 2.09 SF/LF = 251 SF.
- Total insulation: 240 + 188 + 251 = 679 SF. Add 10% waste: 679 × 1.10 = 747 SF.
Step 6 – Hangers and supports.
- Rectangular duct: 40 LF / 8 ft spacing = 5 supports.
- Spiral duct: 60 LF / 10 ft spacing = 6 supports.
- Flex duct: 120 LF / 5 ft spacing = 24 supports.
- Total: 35 supports (trapeze or clevis).
Step 7 – Apply ZIP-adjusted pricing.
We price material, labor, and equipment separately using RSMeans data for your ZIP code. Waste factors are applied as separate lines. The final estimate shows each item with quantity, unit, and sheet reference.
This example covers one AHU and its duct. For a full mechanical package, we take off all systems together, assign shared items once, and deliver in 24–48 hours.
What drives mechanical construction estimating cost
Relative impact on a typical estimate for this trade, based on estimator judgment. Select a bar for details.
System type
A VAV system with central air handlers and ductwork costs more per square foot than a distributed rooftop unit system. Chilled water piping adds material and labor. The choice affects both equipment cost and the amount of duct and pipe to install. For example, a VAV system requires variable frequency drives, pressure sensors, and a larger duct network, while a rooftop unit system may use simple constant volume units with less ducting. We take off the system as designed, so the estimate reflects the specified type.
A VAV system with central air handlers and ductwork costs more per square foot than a distributed rooftop unit system. Chilled water piping adds material and labor. The choice affects both equipment cost and the amount of duct and pipe to install. For example, a VAV system requires variable frequency drives, pressure sensors, and a larger duct network, while a rooftop unit system may use simple constant volume units with less ducting. We take off the system as designed, so the estimate reflects the specified type.
Sch. 40 black steel pipe costs less than Sch. 80 or copper but requires more labor to cut and thread. PEX is faster to install but limited to certain applications. Duct material — rectangular galvanized vs. spiral vs. flex — changes both unit cost and labor hours per LF. For instance, spiral duct has a higher material cost but lower installation labor than rectangular duct, which requires more hangers and seams. We price the material specified and note where alternatives could reduce cost.
Tight ceiling plenums, seismic bracing, and coordination with structural steel increase labor. High spaces require lifts or scaffolding. Confined spaces slow installation. These factors are reflected in labor hours, not material cost. For example, routing duct through a congested corridor may require offsets and additional fittings, which add both material and labor. We note where access is limited and adjust labor hours accordingly, but final means and methods remain your responsibility.
Seismic bracing, fire/smoke damper requirements, ventilation rates, and insulation levels vary by jurisdiction and adopted code edition. Confirm the adopted code edition with the local building department. These requirements add material and labor that must be estimated. For instance, in high-seismic zones, pipe and duct must be braced at closer intervals, increasing the number of supports. Ventilation rates driven by ASHRAE 62.1 may require larger air handlers and duct sizes. We include these items based on the code edition noted in the specs.
Division 23 vs. Division 25 split determines who provides VFDs, sensors, thermostats, and the head-end. If controls are by others, the mechanical estimate excludes them. If included, we price points and devices based on the sequence of operations. For example, a project with a full DDC system may have hundreds of points, each requiring a sensor, wiring, and programming. We read both sections and assign items to one division to avoid double-counting, noting the specification reference.
Larger equipment costs more and may require structural supports, rigging, and larger electrical feeds. The number of units affects both equipment cost and the amount of piping and ductwork to connect them. For example, a single 500-ton chiller versus three 170-ton chillers changes the piping layout, valve count, and control sequence. We take off equipment from the schedule and include associated accessories like vibration isolators, flexible connections, and drain pans as separate line items.
Labor rates vary by ZIP code and union vs. open shop. Productivity is affected by crew experience, site conditions, and season. We adjust labor hours using RSMeans data for your ZIP code, but your actual rates may differ. For example, a project in a high-cost urban area will have higher labor rates than a rural one. We separate material, labor, and equipment costs so you can apply your own rates and markups. Waste factors and overtime are not included unless specified.
Common scope gaps we catch
These items are frequently missed or duplicated in mechanical bids. We flag them in the takeoff with a note on where they belong.
- Fire/smoke damper sleeves and access panels at rated shaft and corridor penetrations are often shown on architectural sheets but required by mechanical code. We cross-check rated wall schedules and add them to the mechanical scope.
- Seismic bracing and sway struts are required by the adopted code in many jurisdictions. They are rarely detailed on mechanical plans. We add an allowance based on pipe and duct sizes and note to confirm with the local building department.
- Rooftop curb adapters, structural curbs, and rigging are sometimes specified under Division 07 or 05. We list them as separate line items so you can decide whether to carry them or exclude them clearly.
- Condensate drain piping, traps, and secondary pans with float switches are often shown only on plumbing plans. We include them in the mechanical takeoff when they serve HVAC equipment, with a note on the responsible trade.
- Refrigerant line sets, insulation, and line hide for split systems are frequently omitted from schedules. We count them based on equipment locations and routing distances shown on plans.
- Controls scope split between Division 23 and Division 25 is a common source of double-counting. We read both sections and assign VFDs, sensors, and thermostats to one division, noting the specification reference.
- Pipe and duct insulation at penetrations and the 3-ft rule near equipment are often missed. We measure insulation to the specified extent and add a note for field verification.
- Sleeves, firestopping, and blockouts through rated assemblies are typically shown on structural or architectural sheets. We include them in the mechanical takeoff if they are required for mechanical penetrations.
- Valve tagging, flow diagrams, and O&M manual binders are specified in Division 23 but sometimes overlooked. We add them as a separate line item based on the number of valves and equipment.
- Startup, TAB, and commissioning hours carried by the mechanical contractor are often underestimated. We include an allowance based on system count and complexity, with a note that final hours depend on the commissioning agent's requirements.
- Cut and patch of drywall and ceilings after rough-in is typically Division 09 work. We exclude it but note where mechanical access panels are required, so you can coordinate with the drywall contractor.
- Scaffolding, lifts, and confined-space access for high or tight routing affect labor. We note where access is limited and adjust labor hours accordingly, but final means and methods remain your responsibility.
Material selection and its effect on takeoff
The material you specify changes both unit cost and labor hours. We take off the material shown on the drawings and note where alternatives could reduce cost.
| Material | Typical use | Unit cost impact | Labor impact |
|---|---|---|---|
| Sch. 40 black steel pipe | Heating water, condenser water, steam | Lower material cost | Higher labor: cutting, threading, and joining |
| Sch. 80 black steel pipe | High-pressure steam, condensate | Higher material cost than Sch. 40 | Similar labor to Sch. 40 but heavier |
| Type L copper pipe | Domestic water, hydronic heating | Higher material cost | Lower labor: soldering or press fittings |
| Type DWV cast iron | Sanitary drainage | Higher material cost | Moderate labor: hub and spigot or couplings |
| PVC drainage pipe | Sanitary and vent | Lower material cost | Lower labor: solvent welding |
| PEX tubing | Domestic water, hydronic | Moderate material cost | Lowest labor: crimp or expansion fittings |
| Rectangular galvanized duct | Supply, return, exhaust | Moderate material cost | Higher labor: seams, hangers, and insulation |
| Spiral duct | Supply, return, exhaust | Higher material cost | Lower labor: fewer seams and hangers |
| Flexible duct | Terminal connections | Lower material cost | Lowest labor: quick installation but limited length |
Codes and standards that affect mechanical quantities
Mechanical takeoffs are driven by the adopted building code, mechanical code, and energy code. The International Building Code (IBC) and International Mechanical Code (IMC) set requirements for ventilation, exhaust, duct construction, and equipment clearance. The International Energy Code (IECC) governs insulation levels and equipment efficiency, which can change duct and pipe insulation thickness and equipment selection. The International Plumbing Code (IPC) or Uniform Plumbing Code (UPC) determines pipe sizing, fixture units, and venting for plumbing systems. NFPA 13 and NFPA 72 affect fire suppression and alarm coordination, but those are typically separate divisions. ASHRAE 62.1 sets minimum ventilation rates, which directly affect air handler capacity and duct sizes. ASHRAE 90.1 sets energy standards for insulation and controls. Seismic bracing requirements come from the IBC and ASCE 7, and they vary by seismic design category. Fire/smoke damper requirements are in the IMC and NFPA 80/105, and they depend on rated wall assemblies.
Because codes are adopted at the state or local level, you must confirm the adopted editions and any local amendments with the local building department. For example, California uses Title 24, which is more stringent than the IECC in some areas. New York City has its own construction codes and energy code. Texas adopts the IBC and IMC but with local amendments. Florida has the Florida Building Code, which includes high-velocity hurricane zone requirements. North Carolina has its own state codes. These variations affect insulation thickness, seismic bracing, ventilation rates, and equipment efficiency. We read the specifications to identify the code edition and note where requirements are unclear. We then adjust quantities accordingly, but final code compliance is the responsibility of the design professional.
Who uses our mechanical estimating for subcontractors
Mechanical contractors
You need a detailed takeoff to price labor and material accurately. Our quantities by size and system let you apply your own labor rates and markups. The marked-up plans help you verify scope before submitting your bid.
General contractors
You need to compare mechanical sub bids and ensure no scope gaps. Our estimate provides a baseline quantity for each system, so you can check that each sub has included the same scope and identify missing items before award.
MEP subcontractors
If you self-perform multiple trades, you need shared items like hangers and sleeves assigned once. Our takeoff separates by division and notes responsibility, preventing double-counting between your HVAC and plumbing crews.
Developers and owners
You need a budget before design is complete. Our conceptual estimate based on square footage and system type gives you a realistic cost range. As design progresses, we refine quantities from the drawings.
Architects and engineers
You need to check that your design is within budget. Our takeoff highlights high-cost items and code-driven requirements, so you can adjust specifications or routing before bid documents are finalized.