What is a preliminary construction cost estimate?
A preliminary construction cost estimate prices a project from incomplete drawings, using order of magnitude or Class 3 methods. KNR's preliminary estimating services quantify drawn scope, apply unit costs from published wage and price data, and list every assumption so the budget can be checked line by line.
Our Professional Preliminary Estimating Services
A preliminary construction cost estimate is built from drawings that are still moving. We price what is drawn, flag what is not, and put every assumption in writing so the number can be defended at the next design meeting. Each offer below is a separate deliverable, and each one starts with a conceptual estimate tied to the current drawing set and a stated basis of estimate. Our preliminary estimating services stop at the level of detail the documents can support, and the bid estimates support the transition once the set is complete.
Element-level quantity takeoffs
We measure the drawn scope by Uniformat element rather than by trade, so foundations, superstructure and envelope can be compared before the details are fixed. Units follow the material: cubic yards of concrete, square feet of form contact area, tons of structural steel, squares of roofing, linear feet of pipe and duct. You receive a line-item quantity workbook with the measurement rule shown beside each line, plus the marked-up drawing pages the quantities came from.
Crew-hour labor pricing
Crew hours are assigned to each measured quantity using a stated productivity rate, and the hours are priced with published wage data and reviewed by an estimator. We separate straight time from overtime, show the crew composition behind each rate, and keep general conditions in Division 01 line items instead of burying them in a lump sum. The output is a labor cost estimate by element, with the rate source noted on every line.
Trade-structured bid pricing
When the design is far enough along to solicit pricing, we assemble the quantities into a bid package structure the trades recognize, with alternates and allowances listed separately. Markups for overhead and profit are shown as line items, not folded into unit costs, so you can see what each layer adds. This is the same discipline we apply across our construction estimating services, scaled to incomplete documents, and it is why owners send us their plans before the set is final.
What Is Included in Our Preliminary Estimates?
Our preliminary estimating services are organized so a reader can trace any total back to a drawing, a measurement rule and a price source. At schematic design the quantities are coarse and the allowances are large; as the set moves toward design development, the same line items tighten and the design contingency shrinks. Every deliverable carries an assumptions log listing what was excluded and what must be confirmed, and the same log feeds the construction budget estimate you carry into the next design phase.
Building elements, site work and general conditions
The estimate is structured on Uniformat elements so nothing falls between trades: A10 foundations, B10 superstructure, B20 exterior enclosure, B30 roofing, C10 interior construction, D10 conveying, D20 plumbing, D30 HVAC, D40 electrical, plus site work and Division 01 general conditions. Each element carries a line item with a unit, a quantity and a unit cost. Items that cannot be measured yet are carried as explicit allowances with a stated basis.
Square footage, element quantities and parametric ratios
Gross floor area is taken from the floor plans and reconciled against the building envelope area, so the two figures agree before ratios are applied. Measured quantities follow the drawn scope: cubic yards of concrete, square feet of wall and slab area, tons of steel, linear feet of pipe and duct, fixture counts from the plumbing plan. Where drawings are too thin to measure, we price by assembly cost per square foot of floor area and label the line as parametric. A waste factor is applied to finish and sheet materials at a typical range and shown as its own line, never absorbed silently.
Materials, labor, equipment and cost breakdowns
Each line item separates the cost components so a change in one does not hide inside another:
- Material: quantity times unit price, with the price source named and any sales tax handled as a separate line.
- Labor: crew hours times the published wage rate, with burden and overtime shown separately.
- Equipment: rental or ownership cost by duration, including cranes, pumps and scaffolding where the scope requires them.
- Markup: overhead, profit, bonds and insurance as visible percentages, not blended into unit costs.
- Contingency: design contingency and construction contingency held apart, with escalation to the midpoint of construction shown as its own line.
Every subtotal is arithmetic you can re-run, and the workbook formulas stay live so you can test a change in square footage or a revised structural system. That is the discipline our preliminary estimating services apply to every early set, whether the drawings are at order of magnitude or schematic design.
Who Needs Our Preliminary Estimating Services?
Early numbers get used for decisions that are hard to reverse: site selection, loan sizing, a go or no-go on a renovation, a target cost handed to the design team. A preliminary construction cost estimate example with its arithmetic exposed lets each reader check the figure against their own scope instead of accepting a single total. We keep the assumptions log in front of the number for exactly that reason, and we label the AACE estimate class so nobody mistakes a Class 3 figure for a bid.
Subcontractors pricing early packages
A trade contractor asked to give a budget number before the documents are complete needs quantities it can defend later when the scope is renegotiated. We measure the drawn scope, state the waste factor and the productivity assumption, and mark every gap as an allowance. The result is a package you can carry into design development without rebuilding it from scratch.
General contractors and home builders
A builder uses the estimate to set a budget estimate for a construction project and to test alternates before committing to a contract sum. Because the line items are separated by Uniformat element, a change from wood frame to steel or from one mechanical system to another can be priced against the same gross floor area. Contingency is stated as a percentage of the measured work, with the reason for the percentage written down.
Developers, architects and suppliers
A developer needs a cost per square foot early enough to test a pro forma; an architect needs a target cost to design against; a supplier needs to know where its product sits in the assembly. Each reader gets the same workbook with the basis of estimate attached, so a disagreement about a number becomes a conversation about a measurement rule. Our construction cost per square foot reference explains how those ratios are built, and our conceptual estimate definition sets out how the early classes differ.
Types of Preliminary Projects We Estimate
The scope that drives a conceptual construction estimate changes with building type, and so does the order of magnitude range we apply. A residential frame is dominated by labor hours and finish allowances; a commercial shell is dominated by structural and envelope quantities; an industrial project is dominated by process equipment and the escalation attached to it. Our preliminary estimating services name the AACE estimate class the estimate was prepared to, so the reader knows how much accuracy to expect.
Residential projects
Single-family and multifamily work is measured from floor plans and elevations: slab and footing volumes, wall and roof areas, window and door counts, and fixture schedules. The building envelope is priced by assembly, and finishes are carried as allowances until a finishes schedule exists. Steel mill products and copper wire and cable have moved sharply in the past year, so those lines carry a dated price and an escalation note rather than a round figure.
Commercial buildings
Office, retail and hospitality projects turn on the structural system, the envelope and the mechanical, electrical and plumbing scope, which together set most of the cost per square foot. We measure gross floor area, exterior wall area and roof area, then price the MEP scope parametrically until equipment schedules appear. Tenant improvement allowances are listed separately from base building work.
Industrial and infrastructure projects
Warehouses, plants and site-heavy projects are driven by earthwork volumes, structural steel tonnage, process piping and long procurement lead times. Escalation matters more here, so the estimate carries a dated price basis and a stated escalation rate to the midpoint of construction. When the set is ready, upload the drawing package for a fee quote, and our preliminary estimating services will quote the fee after review; for hard bids, pair the package with professional hard bid and bid day support.
Our Preliminary Estimating Process
A preliminary estimate is built in the same order every time: read the drawings, measure what is drawn, price what is measured, then check the arithmetic against the design intent. At schematic design the drawings are usually incomplete, so we document every gap as an assumption rather than filling it silently. The result is an estimate you can defend line by line, not a single number pulled from a rate table. Our construction cost estimates carry the same discipline at every design stage.
We classify each estimate against the AACE estimate classes so you know what accuracy band the documents support. A schematic set with floor plans and a structural system but no finish schedule typically lands in Class 3 territory, where a design allowance covers the undesigned scope. That classification is stated on the cover of the deliverable, alongside the drawing revision we priced.
Submit drawings and specifications
Send the current architectural, structural and MEP sheets as PDFs, plus any specifications, a finishes schedule, a site plan and the geotechnical report if one exists. We log the drawing date, revision and sheet count in the assumptions log so the estimate is tied to a specific issue. If a sheet is missing or marked preliminary, we note the gap and ask one consolidated question list before measuring.
Plan review and digital takeoff
The estimator reviews the set for scope coverage first, then performs an on-screen takeoff of measurable quantities: gross floor area by floor, exterior wall area by assembly, slab and foundation volumes, roof area and fixture counts. Where a system is not yet drawn, we carry it as a parametric line rather than omitting it. Every quantity records its measurement rule, such as area measured to the outside face of the building envelope.
Cost calculation, quality checks and delivery
Quantities are multiplied by unit costs, then extended and subtotaled by CSI MasterFormat division and cross-checked by Uniformat assembly. A second estimator reviews the takeoff against the drawings for missed scope, and the totals are compared to a cost per square foot benchmark for the building type. You receive the Excel workbook and PDF summary with marked-up pages. To start, upload your drawing set.
Sample Preliminary Estimate and Deliverables
The example below is illustrative and uses rounded unit costs for a 12,000 sq ft single-story office shell; it is not a quote for your project and does not reflect current market pricing. The arithmetic is shown so you can follow the method: quantity times unit cost, extended, then design contingency applied to the undesigned scope only.
Early stage construction cost estimating depends on stating assumptions plainly. Here the assumptions are a slab-on-grade foundation, steel frame with metal stud infill, a standing seam roof, and mechanical electrical plumbing priced at a parametric rate per square foot because no drawings exist. Parametric estimating of that kind is labeled in the workbook so you can replace it once design develops.
| Item | Qty | Unit | Unit cost range | Extended range |
|---|---|---|---|---|
| Slab-on-grade, 5 in. | 12,000 | SF | $7.50 – $9.00 | $90,000 – $108,000 |
| Structural steel frame | 55 | tons | $3,200 – $3,800 | $176,000 – $209,000 |
| Exterior wall assembly | 4,800 | SF | $38 – $46 | $182,400 – $220,800 |
| Standing seam roof | 12,600 | SF | $14 – $17 | $176,400 – $214,200 |
| MEP, parametric | 12,000 | SF | $32 – $40 | $384,000 – $480,000 |
| General conditions, 8% | — | LS | 8% of subtotal | $80,704 – $98,560 |
| Design contingency, 10% | — | LS | 10% of subtotal | $100,880 – $123,200 |
| Total | — | — | — | $1,190,384 – $1,453,760 |
Excel quantity takeoff sheet
The workbook holds one tab per trade with columns for item, quantity, unit, measurement rule, source sheet and waste factor where material is ordered. Formulas stay live, so changing a quantity updates the extended cost and the division subtotal. A summary tab rolls the line items up by CSI MasterFormat division and by Uniformat assembly.
Marked-up drawings
Every measured area, length and count is color-coded on a copy of your PDF sheets, with the takeoff color key on the first page. When a reviewer asks where a slab volume came from, the marked-up plan shows the boundary and the thickness assumption. Undesigned scope is hatched and tagged to the parametric line in the workbook.
Itemized cost estimate
The PDF summary lists each line item with quantity, unit, unit cost, extended cost and the basis of estimate. Design contingency sits as its own line, sized to the share of scope still undesigned, and is never buried in a unit rate. A cover page states the AACE estimate class, the drawing revision priced and the assumptions log.
Software and Pricing Data We Use
A budget estimate for construction project work is only as good as the cost inputs behind it, so we separate measured quantities from priced rates in every workbook. Material rates are tied to published producer price movement, and labor rates are tied to published wage data adjusted for the project's location. When a rate changes between revisions, the change is visible in the line item rather than absorbed into a new total.
The chart below shows the Producer Price Index series for the materials in this scope, rebased to 100 so the relative movement of lumber, ready-mix concrete, steel mill products and copper wire and cable can be compared on one axis.
Takeoff and estimating software
We work in three tool categories: PDF and on-screen takeoff for measuring drawings, spreadsheet estimating for the line-item build-up and formulas, and commercial cost databases for unit cost baselines. Each measured quantity carries the sheet it came from and the measurement rule applied. The workbook is delivered with live formulas so your team can audit any cell.
Regional material and labor pricing method
National average unit costs are adjusted with published U.S. wage and price data, then reviewed by an estimator against the local market, prevailing wage requirements and project conditions. The wage table below shows the BLS median hourly rates for the trades in this scope; the chart shows material price movement. Construction contingency and the cost of the finishes schedule are carried as separate lines so neither is hidden in a trade rate.
Material price movement, Oct 2023 to Sep 2026
| Occupation | 25th percentile | Median | 75th percentile |
|---|---|---|---|
| Construction laborers | $18.57 | $22.66 | $28.72 |
| Carpenters | $23.32 | $29.12 | $36.94 |
| Electricians | $23.76 | $30.38 | $40.36 |
| Plumbers, pipefitters and steamfitters | $24.13 | $30.67 | $40.92 |
| Cement masons and concrete finishers | $22.60 | $27.41 | $32.15 |
| First-line supervisors, construction trades | $30.48 | $38.42 | $48.78 |
| Cost estimators | $29.40 | $37.86 | $48.97 |
Base wages before payroll taxes, insurance and benefits. Source: BLS Occupational Employment and Wage Statistics, national, all industries.
Why Contractors Choose Our Estimating Services
An order of magnitude estimate construction teams can use has to survive scrutiny from an owner, a lender or a design team. We build every preliminary estimate so each number traces back to a drawing, a measurement rule and a published cost source. That traceability is what separates a working budget from a guess with a decimal point.
The basis of estimate document travels with the workbook and states the drawing revision, the AACE estimate class, the exclusions and the assumptions. When the design moves, you can see which line items changed and why. Our professional budget estimating services follow the same rule: every line item carries its unit, its measurement rule and its source.
Trade-specific expertise
Each division is priced by an estimator who knows how that trade is bought and built, from cast-in-place concrete formwork to fire alarm devices. General conditions in Division 01 are built from the project's actual duration, supervision and temporary facilities rather than a flat percentage. That matters when the cost per square foot of two schemes needs a fair comparison.
Quality control and clear assumptions
A second estimator checks the takeoff against the drawings before delivery, looking for missed scope, double-counted areas and unit errors. The assumptions log lists every gap in the documents and the allowance carried for it. If a reviewer disagrees with an assumption, the line item can be repriced without rebuilding the estimate.
Turnaround, communication and revisions
Delivery dates are agreed in writing when we accept the project, based on sheet count, scope and the level of design completeness. One estimator owns your file and answers questions directly through the review. Revisions against a new drawing issue are quoted as additional scope so you know what changed before work starts. Send us your current drawing set to confirm scope and fee.
Preliminary Estimating Services Pricing
The fee for preliminary estimating services is quoted per project after we review the plans. There is no rate card, because a 40-sheet schematic set for a warehouse and a 6-sheet concept package for a tenant fit-out do not carry the same effort. We read the drawings, count the sheets and trades, and confirm whether alternates or addenda are in scope before we send a fixed fee.
The estimate itself is built from unit cost and assembly cost lines, priced against published U.S. wage and price data, then reviewed by an estimator. At schematic design that often lands at a Class 3 estimate construction level, where assemblies are priced by gross floor area and building envelope type rather than by individual components. The contingency calculator below returns a low and high contingency and a budget range from two inputs: your base estimate and the AACE estimate class you select.
How quotes are calculated
We price the review effort first: sheet count, number of CSI MasterFormat divisions touched, whether a finishes schedule or equipment list exists, and how many alternates and addenda need separate treatment. Then we scope the deliverable — a line-item summary with Division 01 general conditions carried separately, plus an assumptions log that records every gap we filled. A conceptual set with no MEP layout takes less time to price than a design development set with risers and a one-line diagram. Send your plans to start the review; the fee follows the scope, not a package tier.
What affects price and delivery time
Drawing completeness drives both. A set with a structural grid, envelope sections and a room schedule supports a tighter estimate than a massing model with a narrative program. Trade count matters as well: a full Divisions 02–33 spread carries more line items than a shell-only scope. Alternates, addenda issued mid-review and multiple building types on one site each add work, because each needs its own quantity takeoff and a clear basis of estimate. We do not publish a delivery time until the set has been reviewed, and we will not quote one before then.
Contingency range by estimate class
- Low contingency
- $150,000 (10%)
- High contingency
- $300,000 (20%)
- Budget range
- $1,650,000 – $1,800,000
Typical planning ranges that follow the AACE estimate-class idea: less design, more contingency. Set the final figure from a risk review of your own project.
Preliminary Estimating Services Across the US
Preliminary estimating services run on national unit costs that we adjust to the project location. Wage levels move the labor share of every line item, and public work adds prevailing wage requirements that can change the labor rate on the same scope. Material delivery distance affects structural steel, ready-mix and specialty envelope products, where freight is a real line in the estimate.
Climate and code differences change assemblies, not just rates. Snow load, seismic design category, wind-borne debris regions and energy code editions shift the structural and envelope systems a schematic design can use, and the local building department confirms which code edition applies. We serve all states from one team, so a project in one region is priced on the same rules as any other, with the location adjustment stated in the basis of estimate. Each bid package we support carries CSI MasterFormat line items so a reviewer can trace any number back to its drawing.
Frequently Asked Questions
How much does a preliminary estimate cost?
The fee is quoted per project after we review the plans. For a preliminary estimate the drivers are the number of sheets and disciplines shown, the gross floor area and building type, how many assemblies must be built up from unit costs, and whether you need a parametric model plus a line-item takeoff. Send the drawing set and we return a scope-based quote.
How long does a preliminary takeoff take?
Delivery is set by the drawing set: sheet count, how many systems are still undefined, and how many unit-cost build-ups the assemblies require. We confirm the delivery date with the quote, so the date you plan around is the one stated in writing before work starts. Preliminary sets with a single-line footprint move faster than sets with a full envelope and MEP narrative.
Do you estimate labor and material costs?
Yes. Each line carries a material quantity with its unit and waste allowance, and a labor component priced in labor-hours at a published wage rate for the trade, then extended by crew and productivity. Equipment, general conditions under Division 01, markup, contingency and escalation sit on separate lines so you can see what each one adds to the total.
What drawings do you need?
For a preliminary estimate, send whatever exists: schematic floor plans, a site plan, elevations, a building section, and any outline specification or program document. A gross floor area figure and a building type are enough to start a parametric model. Mark the sheets that are superseded so the basis of estimate records the right revision.
Can you use my estimate template?
Send the template along with the plans and we confirm whether the estimate can be delivered in it. We check the template's line structure, unit columns and summary rollups against the Uniformat or CSI MasterFormat breakdown the estimate uses. If a column or rollup cannot be populated cleanly, we say so before the quote.
Do you sign NDAs?
Clients can request an NDA before sending drawings, and the terms are agreed before plan review begins. Send the proposed agreement with your first message so the review and the estimate are not held up. We do not publish a standard NDA policy, so the terms are handled per project.
What is the difference between a preliminary estimate and a conceptual estimate?
The terms overlap. A conceptual estimate is built from program and unit costs before drawings exist; a preliminary estimate is built from schematic or design development drawings that are still incomplete. Our preliminary estimating services sit in the middle: enough drawing to measure gross floor area and major assemblies, not enough to price every finish.
Which AACE estimate class does a preliminary estimate fall into?
Schematic design sets usually land in Class 3, with expected accuracy in the range AACE associates with that class and contingency carried openly on its own line. Order of magnitude work at program stage is Class 4 or 5. We state the class and the basis of estimate on the cover so the reader knows how much definition the number rests on.
How do you handle incomplete drawings?
Every gap is written into an assumptions log with the value used and the reason. Missing information becomes a stated allowance rather than a silent number: an allowance for the finishes schedule, a design contingency for unresolved structure, and a construction contingency for scope not yet detailed. The log ships with the workbook so the number can be defended.
Do you break the estimate down by Uniformat or CSI MasterFormat?
Both, depending on the reader. Early-stage estimates roll up by Uniformat elements such as foundations, superstructure, exterior enclosure and interior finishes, which matches how designers think at schematic design. The detail lines carry CSI MasterFormat division codes so the same estimate converts into a bid package structure later without re-keying.
How is escalation handled in a preliminary estimate?
Escalation is a separate line, never folded into unit costs. We apply it from the estimate basis date to the expected midpoint of construction, using published producer price index movement for the material groups that dominate the project, such as lumber, ready-mix, steel mill products and copper wire and cable. The index series and the period used are printed on the line.
Can a preliminary estimate be used for a construction loan or budget approval?
It can, provided the basis of estimate travels with it. Lenders and owners want to see the gross floor area, the unit costs, the contingency, the escalation and the assumptions in one document. Our workbook and PDF summary carry all five, with marked-up drawing pages showing where each quantity was measured.
Do you estimate renovations and additions, not just new buildings?
Yes, and they need more care. Renovation quantities depend on selective demolition scope, existing conditions and phasing around occupied space, so the estimate carries a demolition line, an existing-conditions allowance and a phasing line for temporary protection and out-of-sequence work. Send existing drawings and any survey or hazmat report you hold.
What happens after the preliminary estimate is delivered?
The workbook becomes the baseline for the next design stage. When design development drawings arrive, we re-measure the changed assemblies and show the variance against the preliminary line by line, so the owner sees which decisions moved the budget. That comparison is where value engineering conversations usually start.