Concrete & foundations
Footings, slabs, walls, and elevated decks quantified by cubic yard, with rebar, formwork, and finishing measured from the structural set.
Construction EstimatingBuilding estimates
Building estimates
that hold up through closeout.
Your Buildbid agent reads the architectural and structural drawings and specs, then returns a division-by-division estimate — priced at your rates, in minutes.
Division-by-division takeoffSub scopes checked for gapsGeneral conditions priced
What the agent takes off. Every division.
Quantities come off your drawings and specs. Costs come from your book and your subs. Nothing is filled in from a per-square-foot average.
Structural steel & framing
Steel tonnage, metal stud and wood framing, sheathing, and connections taken off by member and level, ready for your rates or a sub quote.
Envelope & roofing
Wall assemblies, insulation, air barriers, cladding, and roofing systems measured by area and edge, with flashing and penetrations counted.
Doors, frames & hardware
Openings matched to the door schedule, with frames, hardware sets, and glazing priced per opening instead of per allowance.
Interior finishes
Drywall, ceilings, flooring, paint, and millwork measured by room from the finish schedule, so the finish budget reflects the drawings.
Sub scope coverage
Every spec section mapped to a self-perform line or a sub, so holes and overlaps between bid packages show up before bid day.
General conditions
Supervision, temporary facilities, equipment, cleanup, and insurance built from the schedule duration, not a flat percentage.
Alternates & allowances
Alternates, unit prices, and allowances pulled from the bid form and priced separately, so the base bid stays clean.
What you get back
Quantity takeoff
Every assembly with units, locations, and the drawing it came from, organized by CSI division.
Bid leveling sheet
Sub quotes side by side against the scope, so you carry the right number, not just the lowest one.
Duration-based general conditions
Time-driven costs tied to the schedule, so a longer job gets priced as one.
Your rates, your markup
Labor, material, fee, and contingency you set — applied the same way on every bid.
And the summary: a bid you can defend line by line, out the door before the addendum deadline.
Where construction bids leak money.
Four assumptions that decide whether a building bid makes margin. Your agent makes each one explicit, priced, and visible before you submit.
Scope gaps between subs
Blocking, firestopping, and cleanup that every sub excludes end up in your fee.
Percentage general conditions
A flat GC percentage ignores schedule length — and the job that runs long pays for it.
Addenda and spec changes
A late addendum that never made it into every sub's quote becomes a change you can't bill.
Allowances left open
Allowances priced too low on bid day become the owner conversation you don't want at closeout.
How it works
1
We build your agent
Tell us how you price building work — your assemblies, labor rates, sub relationships, fee, and markups. We train a custom AI agent on your way of bidding.
2
Drop in your plans
Upload the drawings, specs, and addenda. Your agent reads them and builds a detailed takeoff by division.
3
Get the estimate fast
Review quantities, sub coverage, and a complete line-item estimate in a fraction of the usual time — then tweak, approve, and send the bid.
How to estimate construction bids
Whether you're a general contractor or self-performing builder, a reliable construction estimate follows the same order. Here is how to bid construction jobs.
- 01
Review the full bid package
Read the drawings, specs, bid form, and addenda before measuring anything. Note alternates, unit prices, allowances, and the schedule.
- 02
Take off quantities by CSI division
Measure concrete, framing, envelope, openings, and finishes division by division, keeping each quantity tied to the sheet it came from.
- 03
Decide self-perform versus subcontract
Assign every spec section to your own crews or a subcontractor so nothing is missing between bid packages.
- 04
Level sub quotes
Compare sub bids side by side against the same scope. The lowest number is often low because something is excluded.
- 05
Price general conditions from the schedule
Build supervision, temporary facilities, equipment, and cleanup from the job duration instead of a flat percentage.
- 06
Add markup, contingency, and bonds
Apply your overhead, fee, contingency, insurance, and bond costs the same way on every bid so your numbers stay comparable.
How do contractors estimate construction costs?
Through a quantity takeoff priced with labor, material, and equipment rates, plus subcontractor quotes, general conditions, and markup.
What causes construction bids to go over budget?
Scope gaps between subcontractors, general conditions that ignore schedule length, and allowances that don't match the drawings.
Buildbid.ai builds a custom AI agent that does these steps on your plans, at your rates, so every construction bid goes out faster and more consistent.
Read the full construction estimating guide →Ready to put an AI agent
on your construction estimates?
Send us a set of drawings and how you build up a bid today. We'll show you the takeoff and the number a custom Buildbid agent comes back with.