Estimating and takeoff, explained the way estimators work.
Question-first guides with worked numbers, not theory. Each guide links to the glossary terms it uses.
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How to level construction bids
To level construction bids, build a bid tab that lays out every sub's pricing by scope line item, then normalize each bid to identical scope by pricing in excluded work, comparing alternates on the same assumptions, and adjusting for qualifications. Award on the lowest adjusted total for the scope the owner will actually sign, not on the lowest cover number, because the low cover number and the lowest real cost are often different bidders.
Read the guideConstruction AP automation: how invoice processing actually works
Construction AP automation captures subcontractor and supplier invoices, extracts the header and line data, suggests cost codes, matches each invoice against the commitment it belongs to, routes it for approval, and syncs the approved entry to your accounting system. It differs from generic AP because every invoice has to reconcile against a subcontract or purchase order, hold retainage per pay application, and clear a lien waiver before money moves. Done well, it removes the manual data entry and matching hours while keeping a human on the coding and approval decisions.
Read the guideThe construction bid process, step by step
The construction bid process runs from finding the opportunity through document and site review, a bid/no-bid decision, sub invitations and quote collection, takeoff and estimate, bid leveling, general conditions and markup, submission, and finally buyout. Most time and risk concentrate in the takeoff and the leveling of sub quotes, where a single missed scope item or apples-to-oranges comparison can erase the margin. AI now compresses the takeoff step, but the estimator still signs off on the number.
Read the guideConstruction cost codes: how job costing actually gets structured
Construction cost codes are the standardized labels that route every dollar on a job to a specific scope of work and a specific kind of cost, so the estimate, the budget, and the actuals all speak the same language. Most US commercial contractors build them on the CSI MasterFormat divisions, then extend each code with a cost type such as labor or material. The point is a closed loop: what you estimated becomes the budget, the field charges actuals against it, and those actuals feed your next bid.
Read the guideConstruction estimating for beginners
Construction estimating is the work of turning a set of drawings into a defensible price. A beginner learns the mechanics in months: read the documents, perform a quantity takeoff, apply unit costs, then add overhead, profit, and contingency to reach a bid. The judgment about risk and means and methods grows over years and stays with the estimator, even as AI tools speed up the measuring.
Read the guideCost per square foot for commercial construction: how to use the number without being burned by it
Cost per square foot (psf) is a project's cost divided by its floor area, and it is a sanity check at the concept stage, not a bid basis. The number is only meaningful once you state its scope (hard costs, soft costs, and land are not the same) and its area definition (gross versus rentable). Because building type, region, height, and finish move it by multiples, the only psf you can trust is the one you derive from your own completed jobs.
Read the guideGuaranteed maximum price (GMP) vs lump sum vs cost-plus contracts
A guaranteed maximum price contract (GMP) sits between lump sum and cost-plus: the contractor guarantees a ceiling, bills open-book against it, and any underrun is split per a savings clause. Lump sum gives the owner a fixed price and puts cost overrun risk on the contractor, while cost-plus reimburses actual cost plus a fee and leaves the owner carrying overrun risk. Unit price covers work where quantities are unknown at bid. Pick the model by how well the scope is defined and who should hold the contingency.
Read the guideHow to do a construction takeoff from drawings, step by step
To do a construction takeoff, assemble the current drawing set and confirm revisions and addenda, set up your takeoff by CSI division or cost code, verify scale, then count items (each), measure lengths and areas (lf, sf), and compute volumes (cy). Apply waste factors, cross-check against schedules and details, and hand the quantities to pricing. The result is a measured quantity list that becomes the foundation of the estimate.
Read the guideHow to estimate construction costs
To estimate construction costs, you review the full scope, perform a quantity takeoff from the drawings, price labor, material, and equipment against current unit costs, then add overheads, markup, and contingency to reach a bid price. The accuracy of the result depends almost entirely on the quality of the takeoff and the pricing data behind it.
Read the guideHow to estimate labor costs in construction
To estimate labor costs, multiply the quantity from your takeoff by a labor unit (hours per unit of work) to get total labor hours, then price those hours at a fully burdened rate that adds payroll taxes, insurance, and benefits to the bare wage. Adjust the labor unit for productivity factors like weather, height, congestion, and overtime fatigue, because labor risk, unlike material risk, stays on your books from bid day to closeout.
Read the guideLien waiver management: the four waiver types and when to use each
There are four lien waivers, built from two pairs: conditional or unconditional, and progress or final. The rule of thumb is simple. Use a conditional waiver before money moves, because it only takes effect once payment actually clears, and reserve unconditional waivers for after the funds have cleared, because they release the lien right the moment they are signed. Managing them well means exchanging the right type at the right step of every pay cycle, down to the second tier, and tracking each one against the pay application it backs.
Read the guideMarkup vs margin in construction estimating
Markup is profit expressed as a percentage of cost (you add it on top of cost), while margin is profit expressed as a percentage of the selling price. They use different denominators, so they never match: a 20 percent markup produces only a 16.7 percent margin. To convert, use margin = markup / (1 + markup) and markup = margin / (1 - margin), and to hit a target margin, divide cost by (1 minus the margin) rather than multiplying.
Read the guideHow to do a material takeoff (MTO)
To do a material takeoff, measure the work off the drawings, then convert each measured quantity into the units suppliers actually sell by dividing by the coverage of one unit, adding a waste or lap allowance, and rounding up to whole sheets, sticks, or tons. A material takeoff (MTO) lists what to buy; a quantity takeoff (QTO) measures the work, so the MTO is built from the QTO and feeds straight into purchase orders and buyout.
Read the guideThe construction pay application process, step by step
A construction pay application is the formal monthly request a contractor submits to bill for work completed, based on a schedule of values that divides the contract into priced line items. Each period you set a percent complete on every line, add any stored materials, subtract retainage, and net out what was already paid to reach the amount due. On most US commercial jobs this runs on the AIA G702 and G703 forms, moves through architect certification, and pays only after the matching lien waivers are exchanged.
Read the guideSubcontractor prequalification: what GCs check
Subcontractor prequalification is the structured review a general contractor runs before issuing bid packages, deciding which trades are allowed to submit a number. GCs check financial capacity and bonding, safety record (EMR and OSHA history), relevant experience and references, current backlog and crew capacity, plus licensing and insurance. A strong, current package gets a sub onto the bid list; a weak or stale one keeps the number from ever being opened.
Read the guideRFI vs RFP vs RFQ vs ITB: what each means
An RFI is a question (no award) used during bidding or construction. An RFQ asks for a price on a defined scope, awarded mostly on price. An RFP asks for a scored proposal, common on design-build, judged on more than price. An ITB or IFB is a sealed hard bid on complete documents, awarded to the lowest responsive bidder.
Read the guideThe 4 types of construction estimates
Construction uses four types of estimates, ordered by how much design information exists: rough order of magnitude (ROM), square foot, assembly, and detailed unit cost estimates. Accuracy tightens as design matures, from swings commonly framed as plus or minus 25 to 50 percent at ROM down to plus or minus 5 to 10 percent on a detailed estimate built from a full quantity takeoff.
Read the guideWaste factors in construction estimating
A waste factor is a percentage added to a measured (neat) takeoff quantity to cover material lost to cuts, breakage, overlap, laps, and error, so the buy quantity reflects what the field actually consumes. Apply it by multiplying the net quantity by one plus the waste percentage, then rounding up to the supplier's order increment. Commonly used US starting points run about 5 percent for concrete, 10 percent for drywall and tile, and 10 to 15 percent for lumber, each calibrated against a firm's own history.
Read the guideHow to bid concrete work as a subcontractor
Bidding concrete work comes down to three things: pricing the forms and the rebar rather than the cubic yards, drawing a hard line between your package and the earthwork package, and writing down who supplies and who sets the embeds. The cubic yard takeoff is the number every GC checks and the smallest part of your cost. Concrete bids are lost on the sitework boundary and on over-pour, not on the price per yard.
Read the guideHow to bid demolition work as a subcontractor
A demolition bid is won or lost on boundaries, not on volume: hazardous material abatement excluded in writing, salvage separated from disposal, and tipping fees owned by someone named in the proposal. The quantities are mixed units, square feet of finishes, cubic yards of debris, counts of items, and the honest ones come from what is concealed behind and above the removal, not from the demo plan. Demolition is usually drawn as a thin keynoted plan, so the scope you did not price is the scope you will be held to.
Read the guideHow to bid drywall work as a subcontractor
Bidding drywall comes down to three things: taking off by wall type from the partition legend rather than by wall from the plan, counting board on both faces at the correct height, and pinning the level of finish before you price the labour. The board is cheap and predictable. The money is in the framing height, the rated assemblies and the finish level, and all three are usually understated on the drawings.
Read the guideHow to bid electrical work as a subcontractor
Bidding electrical on a commercial job comes down to three things: fixing the boundary between Division 26 and the low-voltage packages that are drawn on your sheets but often belong to someone else, taking quantities off the one-line diagram and the panel schedules rather than the floor plans, and writing down every connection to equipment furnished by others. The device count is the easy part. Electrical bids are lost on scope boundaries and homerun footage, not on the price per receptacle. A house bid starts from the floor plan and code minimums.
Read the guideHow to bid flooring work as a subcontractor
Bidding flooring is mostly a scope-boundary exercise, not a square-foot exercise. Floor preparation and slab moisture are the two items that decide whether the job makes money, and neither one is drawn anywhere in the set, so the sub who writes the prep condition and the moisture assumption into the proposal is the one who gets paid for them later. Quantities come off the finish schedule and the finish plans room by room, and the obvious area takeoff misses pattern waste, roll geometry and attic stock.
Read the guideHow to bid framing work as a subcontractor
Bidding framing comes down to three things: getting the lumber quantity right in board feet with the plates, opening studs and waste your first pass misses, taking the connectors and hold-downs off the schedules rather than the plans, and deciding in writing whether blocking and backing for other trades is in your number. The board footage is the part you can defend. The scope boundary is the part that costs you money.
Read the guideHow to bid glazing work as a subcontractor
Bidding glazing comes down to three things: pulling sizes off the window and storefront schedules instead of scaling the elevations, pricing glass the way your fabricator will actually bill it, and drawing a hard line at the perimeter seal and the barrier tie-in. Square feet of glass and linear feet of frame are the easy part. Glazing bids are usually lost at the boundary of the opening, not on the price per square foot.
Read the guideHow to bid HVAC work as a subcontractor
Bidding HVAC comes down to three things: taking ductwork off in pounds of sheet metal by gauge rather than in linear feet, drawing a hard line around controls, balancing and insulation before you price anything, and writing every boundary down so the GC cannot level it onto you later. The equipment is quoted by vendors and everyone gets a similar number. Mechanical bids are won and lost on the sheet metal quantity and the scope edges.
Read the guideHow to bid insulation work as a subcontractor
Bidding insulation comes down to three things: deciding which of the four insulation packages you are actually pricing, taking off square feet of assembly by insulation type and R-value rather than by wall area, and writing down who owns air barrier continuity at the transitions. Roof insulation, mechanical pipe and duct insulation, and acoustical batt in partitions are the three boundaries that cost insulation subs money, because each one is routinely assumed by two trades at once.
Read the guideHow to bid landscaping work as a subcontractor
Bidding landscape work comes down to three boundaries and one duration. The boundaries are where the earthwork sub's grading stops and your finish grading starts, where the topsoil comes from, and where the irrigation water comes from including the meter and the backflow assembly. The duration is the maintenance and establishment period after substantial completion, which is schedule risk carried in a price, not installation cost, and it is the line most landscape subs price too thin.
Read the guideHow to bid masonry work as a subcontractor
Bidding masonry comes down to three things: quantifying square footage separately for every wall type rather than every elevation, deciding in writing who supplies and places the reinforcing, grout, lintels and cavity flashing, and stating your openings deduction rule so the GC can compare your square footage to everyone else's. The unit conversions are arithmetic. The bid is won or lost on the scope boundary at the edges of Division 04.
Read the guideHow to bid painting work as a subcontractor
Painting is bid by the square foot of surface, split by substrate and by the coating system the finish schedule assigns to it, with each coat in the system counted as its own application. The number is rarely where painting bids go wrong. They go wrong on the two boundaries nobody writes down: the surface preparation standard you are being held to, and the condition the substrate has to be in before your price is valid.
Read the guideHow to bid plumbing work as a subcontractor
Bidding plumbing comes down to three things: fixing exactly where your pipe stops at the building line, counting more than the fixture schedule shows, and pricing the underslab rough-in against the concrete pour sequence rather than against footage. The pipe is the easy part. Plumbing bids are usually lost at the boundaries, the five foot line, the fixture supply question, and who owns the trench.
Read the guideHow to bid roofing work as a subcontractor
Bidding roofing comes down to three things: converting plan area into real roof area, drawing a hard line around insulation, deck, drains, curbs and sheet metal, and pricing the assembly the warranty actually requires rather than the one on the plan. The membrane is the cheap part of the argument. Most roofing bids are lost on the boundary and on the warranty, not on the price per square.
Read the guideHow to bid sitework and earthwork as a subcontractor
Bidding earthwork comes down to three things: getting the cut and fill volumes right in the state the dirt is actually in, drawing a hard line around who owns the haul and the tipping fees, and pricing rock, unsuitable material and dewatering as unit prices instead of burying them in a lump sum. The volume calculation is the part everyone does. The boundary and the unit prices are where earthwork subs lose money.
Read the guideHow to bid structural steel work as a subcontractor
Bidding structural steel comes down to three things: getting the tonnage right including connection material, drawing a hard line around what is structural steel and what is miscellaneous metals, and writing the exclusions down so the GC cannot level them onto you later. The number itself is the easy part. Most steel bids are won or lost on the scope boundary, not the price per ton.
Read the guideEstimating painting cost: how to build the number from the surface up
Estimating painting cost means pricing coated surface area, not floor area. Measure each substrate, multiply by the number of coats in the finish schedule, then convert that area into labour hours using your own production rates. Labour and preparation dominate the total, so material is the smaller half. Add prep, access and height as separate lines, then apply markup. The floor plan is only a sanity check.
Read the guideEstimating demolition costs: what is being removed, and where it goes
Estimating demolition costs starts by classifying the work as selective, interior or structural, because those price differently, then quantifying what is actually being removed assembly by assembly. Convert those quantities into debris volume and weight to size haul-off, price labour and equipment against how hard the work is to reach, and carry abatement as its own line. Cost per square foot is a concept-stage check, never a bid basis.
Read the guideEstimating vinyl siding
Estimating vinyl siding starts on the elevations: measure wall and gable areas, subtract openings under a stated deduction convention, add waste for the actual layout, then divide by 100 because 1 siding square equals 100 square feet. Convert the adjusted squares to boxes using the exact coverage for the selected product, and carry starter strip, J-channel, corner posts, undersill, utility trim, soffit, and fascia as separate quantities.
Read the guideEstimating excavation costs
Estimating excavation costs starts by separating mass, structural, and trench excavation, then measuring each in bank cubic yards from the drawings. Convert only the quantities that become loose truck volume or compacted fill, and price digging, on-site handling, import, export, backfill, protection, and grading as visible lines. The geotechnical report and the destination of the soil often move the estimate more than the raw volume does.
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