Field-tested perspective on construction estimating, AI takeoffs, labor units, and code changes — written by people who have run the bids.
IECC 2021 Table C402.4, 30% and 40% WWR thresholds, frame class vs whole-product U-factor, low-E silver coating tiers, NFRC certification, and bird-safe Section 3113 scope.
Cavity vs continuous per ASHRAE 90.1-2022 Tables 5.5-1 through 5.5-8, polyiso LTTR aging, vapor retarder placement by climate zone, and thermal-bridging math.
NFPA 13-2022 Section 10.2.7, the 3x beam rule, 18-inch deflector clearance, hazard classification area changes, and how K-factor selection rewrites pipe sizing.
T&M pays cost plus markup on every hour. Lump sum pays only what you priced. The AIA G701 method you quote decides who owns the productivity risk.
Schedule says one RTU, Section 23 74 13 says another. A walk-through of ASHRAE 90.1-2019 efficiency tiers, VAV sizing per 62.1, and the R-454B transition.
AIA A201 is silent on escalation — default risk is on the contractor. Structuring clauses around BLS PPI series codes with thresholds and caps is how to price it.
FICA, SUTA, workers comp NCCI codes, fringe, GL, bonding, Davis-Bacon — the full burden on a construction wage lands 32-75% above base. Estimators missing pieces lose bids.
RSMeans is fast and defensible at Class 3 accuracy on small jobs. Assembly estimating with MCAA and NECA labor units wins above $2M — here's where the accuracy delta sits.
AIA G702/G703 mechanics, CSI division weighting, mobilization caps, A201 Article 9.3.2 stored-materials rules, lien waivers, and how GCs auto-audit SOVs today.
AIA A305, ConsensusDocs 221, D&B PAYDEX, single and aggregate bonding capacity, EMR, OSHA 300A, and CCIP/OCIP distinctions — the four numbers that drive approval.
CFMA's 2024 benchmarks put commercial GC net at 2.3% and electrical subs at 3.8%. Survivor bias, MCAA productivity losses, and why the second-lowest number is usually right.
A weighted seven-question rubric grounded in FMI bid-hit-ratio data, owner pay history, AR exposure, backlog fit, personnel availability, retention, and 90-day cash flow.
29 CFR 1926.1153 Table 1 is understood but not priced right. The 10-18% productivity hit, cartridge burn, and medical surveillance belong in labor — not general conditions.
The 2020 revision moved subsections and tightened division boundaries. Most crosswalks to Sage, Viewpoint, and Procore haven't caught up — and history is lying to you.
Wage determinations, apprentice ratios, and fringe delivery build the compliant crew rate. Open-shop defaults silently wipe 6-14% of margin on federal bids.
You priced the DD model at LOD 300, then the CD set came back at LOD 350 and the number moved 6-11%. Here is where the geometry and data actually change.
Loaded cost per LF on site utilities spans 4-5× across depth classes once OSHA Subpart P soil types, dewatering, rock exposure, and pavement restoration are priced honestly.
Shear tabs, gussets, stiffeners, and moment end plates add 8-12% to member tonnage on typical commercial steel and 13-16% on seismic moment frames.
Stick runs $72-90/SF installed, unitized $110-145/SF. Crane hours, AAMA 501 field-test risk, and 9 weeks of weather-tight schedule are where the real math lives.
A single bar-size bump on the schedule moves tonnage by 56%, shifts development and lap lengths, and triggers A706 vs. A615 spec mismatches that routinely cost $40k.
The cubic yard count is the easy part. The waste factor, pour sequence, and form contact area are where concrete bids actually get won or lost.
BCY, CCY, LCY — the three acronyms that decide whether your dirt bid makes money. Most contractors pick two and ignore the third.
Level 4 or Level 5? 25 gauge or 20 gauge? The AWCI standard is clear. Your takeoff template is not. The gap is where drywall jobs bleed.
Plan-view takeoffs flatten the building. Every riser you forget to climb shows up as red ink when the fixtures get rough-set.
The head count looks right. The pipe LF looks right. Then the hydraulic calc comes back and your 1-inch branch has to be 1-1/4. There goes your margin.
The quantification layer of estimating is the last major workflow in construction still done by hand. That changes this year.
Between the member schedule and the real fabrication ticket, a tonnage gap hides in connections, misc metals, and shear studs. Every steel estimator lives with it.
The elevation shows stick-built. Section 084413 says unitized. The spec addendum changed the IGU makeup on week three. One miss here costs a Porsche.
The spec says two coats. The MPI sheet says 350 sqft per gallon. Your crew is hitting 210. Here is where painting bids quietly hemorrhage margin.
The 2023 edition is the biggest practical overhaul for commercial takeoffs since 2017. Here is what moves the bid number.
A 5% waste factor on 8x8x16 block sounds safe. Until you run the bond course, lintel, and dowel math and find out you are 14% short.
It is almost never the material price. It is the labor unit, and specifically the three adjustments estimators forget to apply.
A roof plan shows plan-view area. The roof sub installs slope-corrected area. Forget the slope factor and you are pricing a building you never measured.
Duct is priced by the pound. Get the gauge wrong and you are not pricing the same building the contractor will install.
We ran the same 50 commercial projects through both processes. Here is what the numbers say — and what they don't.
NECA's 2025 MLU update moved more units than the 2022 update. Here is where, and what it means for your assembly library.
See how PILRS turns a 22-hour takeoff into a 2-hour review, on your next bid.
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