Preconstruction intelligence · for general contractors
The whole job,
from one intake.
One connected record — estimate, schedule, buyout, and actuals — calibrated to how your firm builds, always in sync.
- IntakeBeacon Hill · 2,840 SF · 60% CDs
- Estimate$602 / SF · 32 divisions
- Schedule34 weeks · CPM
- Procurement12 long-lead items
- Actualsvariance −2.1% · learning
The reality
Bid day doesn’t wait for complete information. That’s the job.
Every GC knows this project. The drawings are at 60%, the finish schedule says TBD, selections are scattered across an email thread — and the owner still wants a number by Friday. Here is the same project, twice.
How it usually starts
Plans at 60% CDs — finish schedule says “TBD”
Tile selections… somewhere in a 40-email thread
Window lead times live in Tony’s head
Last estimate: v7_FINAL_final.xlsx
Owner wants the number by Friday
The same project in Constack
Scope structured from the drawings you have
Sheets classified, work area traced, scope drivers captured.
Unknowns surfaced as allowances
Unpicked tile becomes a visible line item — not a buried guess.
Schedule and buyout drafted with the estimate
Order-by dates exist before the number is even sent.
Open questions on one list
Three flagged follow-ups instead of three field surprises.
The workflow — one intake, four deliverables, zero re-entry
B-02 · The workflow
One intake. Four deliverables. Zero re-entry.
Precon record · PRJ-0142
● In sync
01 · Intake
3 open questions flagged
02 · CSI estimate
03 · CPM schedule
34 weeks on-site · critical path in amber
04 · Procurement
B-02 · 01
Give it the project the way you actually have it.
- Drawing set classified page by page
- Existing-conditions photos analyzed for hidden scope
- Open questions flagged before they become costly surprises
B-02 · 02
A CSI estimate that defends its own numbers.
- MasterFormat divisions, not vague categories
- Allowances flagged where the drawings are silent
- Contingency tied to design stage — 20 / 15 / 10%
B-02 · 03
The schedule starts with the estimate, not after it.
- Gantt and look-ahead views your supers will use
- Milestones held at zero duration, always
- Critical path flagged so you see what moves the date
B-02 · 04
Order-by dates worked backward from the schedule.
- Lead-time library tuned to your suppliers
- Submittals: shop drawings vs. data sheets, per item
- Subcontractor COI compliance tracked alongside
The intelligence
Calibrated to your firm — not a national average.
Two GCs can build the same kitchen and carry costs 40% apart — and both be right. Generic AI gives you the average of the internet. Constack gives you your numbers, in your market, by your rules.
Company Brain
Upload SOPs, sub bids, meeting minutes, and old contracts. Constack extracts the rules your senior estimators carry in their heads — and applies them to every estimate, schedule, and buyout it produces.
Regional calibration
Costs and labor rates indexed to your metro, down to the suburb. A Beacon Hill townhouse doesn’t price like the national average, and Constack doesn’t pretend it does.
A loop that tightens
Recorded actuals feed back into the model. The gap between estimate and reality narrows with every closed project.
What the model is calibrated on, and what early-access partners say
Calibration corpus · Not a demo dataset
649
Proprietary schedule activities
from 13 built projects
87
Historical trade costs
real subcontractor invoices
234
CSI division benchmarks
158
Metro cost indices
down to the suburb
213
Schedule patterns
aggregated durations
Most tools we have evaluated treat preconstruction as a generic data-entry exercise. Constack does not. It generates results that reflect how an experienced general contractor actually thinks about a project.
Calibrated to regional conditions, quality tier, and the specific operational practices of the firm using it, its ability to learn from each completed project is what will set it apart over time.
Invite-only while we onboard our first firms
Start with the project
on your desk right now.
Constack is currently invite-only. Tell us about your firm and the project on your desk — we’ll set you up, and you’ll have an estimate, a schedule, and a procurement plan to react to.