An estimate that survives engineering.
A defensible cab estimate connects scope to quantities, quantities to cost, and operations to station hours. It also states what is unknown. The goal is not false precision. The goal is a quote that can be audited when drawings change.
Name the project, cars, drawing revision, specification sections, survey status, inclusions, exclusions, alternates, and quoted schedule basis.
Measure and count every cab component. Record unit, quantity, material specification, finish, yield assumption, source, and supporting drawing location.
Use an approved rate library only where it fits. Attach current vendor quotes for project-specific or uncertain items, including freight and quote validity.
Assign hours to the operations that will perform the work. Use your shop's approved hourly rate and identify overtime or premium conditions separately.
Price packaging, inbound freight, delivery, unloading, storage, travel, access restrictions, installation, supervision, and likely return work.
Check quantities, commercial terms, lead times, assumptions, contingency, and margin under your company's approval rules before release.
Organize the BOM the way the cab will be detailed, bought, fabricated, assembled, and checked. Categories vary by design, but this structure exposes omissions.
| Component group | Takeoff questions |
|---|---|
| Wall system | How many panels, substrates, clips, reveals, returns, fasteners, and finish sheets? What grain direction and yield apply? |
| Fronts and entrances | What is included by the cab supplier, and what interfaces with work by the elevator contractor or others? |
| Ceiling and lighting | What frame, panels, diffusers, fixtures, drivers, wiring, access, and listing requirements are specified? |
| Floor, base, rails, hardware | Who supplies each item? Include supports, backing, brackets, joints, transitions, cutouts, and attachment hardware. |
| Protection and packing | What film, crating, blocking, labels, moisture protection, and handling provisions will preserve finished work? |
Do not hide labour in one blended number. Break it into engineering and detailing, programming or layout, cutting, forming, welding, grinding, finishing, panel assembly, ceiling or lighting assembly, quality inspection, packing, delivery, and installation. Use the stations that match your shop.
For each station, record planned hours, crew assumptions, setup time, repeated-unit learning where your approved method permits it, and your shop's approved hourly rate. Separate premium time, travel, supervision, and restricted jobsite hours. The same hour structure later supports capacity planning; the project stages guide explains that production gate.
Catalogue or rate-library pricing fits repeatable standard items when the source, effective date, unit, and purchasing conditions are controlled. Vendor quotes belong on custom fabrication, specialty finishes, glass, stone, unique hardware, outsourced processes, and any item with uncertain delivered cost or lead time.
Store the quote with the estimate. Capture expiration, minimum order, tooling, setup, freight, taxes where applicable, exclusions, submittal requirements, and lead time. If the quote expires before likely release, state the exposure. Never replace a missing quote with unexplained contingency.
Freight is more than one carrier line. Include inbound supplier freight, dedicated or consolidated shop-to-site delivery, fuel or access charges where quoted, crating, unloading, hoisting, storage, redelivery, and protection. Confirm dock size, street restrictions, delivery windows, floor path, service-elevator availability, security, and work-hour rules.
Contingency belongs against named uncertainty. Incomplete survey dimensions, unsettled finishes, volatile supply, compressed review periods, or difficult access may justify an allowance under your shop's policy. Identify what it covers. Keep exclusions explicit. Do not invent a universal percentage.
Freeze the quoted baseline: scope, revision, BOM, station hours, vendor support, logistics, assumptions, and price. When survey findings or drawing comments change material, quantity, finish, geometry, labour, freight, access, or schedule, compare the revised condition line by line.
That delta becomes the final estimate or change order. Include additions, credits, lead-time effect, and the revision that caused them. Obtain required approval before purchase or fabrication. The submittal approval guide explains how Final for Record establishes the controlled production scope.
Return to the resource hub, or see how the platform connects BOM, revisions, purchasing, and station capacity.
The estimate should include a component-level material takeoff, waste or yield assumptions, bought-out items, labour hours by shop station, engineering and project effort where applicable, finishing, packaging, freight, installation, site-access impacts, contingency, exclusions, alternates, taxes or permits when applicable, and the commercial assumptions that define the quoted scope.
Estimate labour by operation or station rather than one blended guess. Typical buckets include engineering, detailing, cutting, fabrication, welding, finishing, panel assembly, electrical or lighting assembly, quality inspection, packing, delivery, and installation. Multiply approved hours by your shop's approved hourly rate, then check whether overtime, travel, or restricted site hours apply.
Use current vendor quotes for custom, volatile, fabricated, or project-specific items whose delivered cost cannot be supported by an approved catalogue or rate library. Examples may include specialty metals, glass, stone, custom lighting, unique hardware, outsourced finishes, and dedicated freight. Keep the quote, validity period, lead time, and exclusions with the estimate.
Separate inbound vendor freight, shop-to-site delivery, unloading, hoisting, storage, and return trips. Confirm dock restrictions, elevator availability, street access, delivery windows, protection requirements, floor travel, security procedures, and union or building rules. Access constraints affect both carrier cost and installer hours and should never be buried in material markup.
There is no universal percentage. Contingency should reflect identified uncertainty: incomplete drawings, unverified dimensions, unsettled finishes, volatile supply, difficult access, or an accelerated schedule. State what the allowance covers and obtain approval under the shop's estimating policy. Contingency is not a substitute for a missing vendor quote or an undefined scope.
Re-price when approved scope changes affect quantity, material, finish, geometry, labour, freight, access, or schedule. Compare the revised takeoff and station hours against the quoted baseline, document the delta, and issue a final estimate or change order before purchasing or fabrication. A drawing revision alone is not commercial approval.
Review the estimating and project controls, or request a walkthrough.
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