Construction Estimator Memory

construction-estimator-memory · 35 facts · by uniqent · 0 installs

35 research-verified facts covering CSI MasterFormat, bid-hit ratios, labor burden, RSMeans pricing, Davis-Bacon compliance, change order markup, and subcontractor leveling for commercial construction estimators.

construction

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bidding

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CSI MasterFormat organizes all construction scope into 50 numbered divisions; Division 03 is Concrete, Division 09 is Finishes, Division 26 is Electrical — every quantity and cost must be coded to a six-digit section

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A healthy bid-hit ratio for competitive public work is 1-in-4 to 1-in-6 (17–25%); a win rate above 40% on hard-bid work usually means the estimator is leaving money on the table

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RSMeans publishes annual unit cost data by trade and City Cost Index multipliers for 340+ US cities; always apply the local CCI before using national averages in a bid

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Commercial gross margin targets: 30–45% on residential work, 15–25% on commercial work; margins below 10% on commercial jobs are a warning sign for underbidding

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Davis-Bacon Act requires payment of prevailing wages on federally funded construction contracts over $2,000; rates are published by the US Department of Labor by county and trade classification

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Payment and performance bonds are typically required for public contracts above $100,000 (federal threshold per the Miller Act); bond premiums run 0.5–1.5% of the contract value

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Procore is the dominant construction management platform for GCs, with integrated takeoff (formerly Esticom), budget, RFI, submittal, and change order modules

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Autodesk Takeoff integrates with BIM 360 and supports 2D and 3D quantity extraction; it exports clean quantity sets to Autodesk Build or Excel for cost loading

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Bluebeam Revu excels at markup and measurement on PDF plans but cannot attach costs to quantities; it is a takeoff complement, not a full estimating platform

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Bid leveling involves normalizing subcontractor quotes to identical scope before selecting a winner; a sub bid more than 15% below the cluster average is a red flag and warrants scope confirmation before award

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Scope letters issued to subcontractors before bidding must define included and excluded CSI MasterFormat sections, interface requirements with adjacent trades, and contract flow-down obligations

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General conditions (Division 01 costs) typically represent 8–15% of the total project cost for commercial GC work; common line items include superintendent salary, project management, trailer, temp utilities, safety, and clean-up

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Labor burden on top of base wages typically runs 30–40% and includes FICA (7.65%), FUTA/SUTA (~3%), workers compensation insurance (by trade, 5–40% of wages), and general liability allocation

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Change order pricing for GC self-perform work typically includes direct cost plus a markup of 10–15% overhead and 5–10% profit; some owner contracts cap the change order markup at 10–15% total

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Constructive changes occur when an owner or architect directs additional work without issuing a formal change order; notice must be given in writing immediately and pricing submitted within the contract's notice period (typically 21 days)

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Differing site conditions (DSC) claims arise when subsurface conditions materially differ from those described in contract documents; written notice is required immediately upon discovery to preserve the claim

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The Eichleay formula is used on federal contracts to calculate home office overhead damages resulting from owner-caused delays; it requires proving actual delay and idle overhead capacity

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Request for Information (RFI) responses from architects that clarify or add scope can create constructive changes; estimators should review all RFIs before closing a bid for latent scope impacts

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Bid bonds are typically 5–10% of the bid amount and guarantee the bidder will enter the contract if awarded; bid bond underwriting requires financial statements and experience records

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Construction material cost inflation averaged 3–5% annually in 2024–2025; bids for projects with a start date more than 6 months out should include an explicit escalation allowance

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MBE (Minority Business Enterprise) and WBE (Women Business Enterprise) participation goals on public projects commonly range from 10–25% of the bid value; subcontract scope letters should flag MBE/WBE availability

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Lump-sum contract requires the GC to absorb all cost overruns; GMP (Guaranteed Maximum Price) allows the owner to audit job costs and share in savings below the GMP; unit-price contracts pay per measured quantity

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Submittal logs track shop drawings, product data, and samples required by specifications; each submittal must be reviewed against the spec section before procurement to avoid costly substitution rejections

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The typical commercial construction estimator manages 3–5 bids per month representing approximately $10M in aggregate bid value at peak productivity; overloading estimators above this threshold increases error rates

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Prevailing wage determination requests for Davis-Bacon work must be submitted to the Department of Labor before bid; unlisted classifications require a conformance request (SF-1444) to set the wage rate for non-standard trades

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Schedule of values (SOV) submitted at contract start must reconcile to the contract amount and be organized by CSI MasterFormat to enable accurate payment application review and lien waiver processing

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Quantity survey accuracy is measured as the percentage variance between estimated quantities and final measured quantities at project close; top estimators target less than 5% variance on self-perform divisions

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Public bidding laws in most states prohibit bid shopping (sharing a sub's number with competitors) after bid submission; violations can result in debarment from future public work

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Open-shop (non-union) projects use market wages; union projects must pay collectively bargained rates plus fringe benefits (pension, health, apprenticeship fund); wage difference between open and union can be 25–60% depending on trade and market

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Design-build delivery requires the estimator to develop a basis of design document alongside the bid; the GC carries both design risk and construction risk under a single contract

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Overhead recovery rate = annual overhead divided by annual direct costs; this percentage is the minimum markup needed on every project just to cover the company's fixed costs before any profit is earned

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A typical commercial project budget contingency at schematic design is 20–25%; at design development it narrows to 10–15%; at construction documents it should be 5–10%

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Notice to Proceed (NTP) is the owner's written authorization to begin construction; the contract duration clock starts on the NTP date; proceeding before NTP without written authorization can void the contractor's delay claims

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Retainage is typically 10% of each progress payment withheld until project completion; some contracts reduce retainage to 5% at 50% project completion to help cash flow on long projects

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Bid day management: collect all sub quotes up to 30 minutes before deadline, plug in the lowest conforming quotes, apply GC markup, review for mathematical errors, and submit before deadline — phone confirmations from subs are binding even without written backup

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