A construction estimating service takes your plans and returns a priced estimate: quantities counted from the drawings, labor and material costs, and markups, ready for you to build a bid on. Most services charge in one of four ways: a fixed fee per project, a rate per square foot, an hourly rate, or a monthly retainer. The price depends mainly on project size, the number of trades, how clean the drawings are, and how fast you need the result. For one concrete example, BidMe's fixed-fee estimates start at $200 for residential and $400 for commercial projects.
What a construction estimating service does
You send drawings. The service measures them (the takeoff), prices the quantities, and sends back files you can bid from. It is the work an in-house estimator does, done by someone who is not on your payroll.
A good service does three jobs, not one. It counts and measures every item the drawings show. It prices those quantities with labor and material costs that fit your location. And it flags everything the drawings do not settle, so you know what you are assuming before you commit to a number.
If you want the measuring step explained first, read what is a takeoff in construction. For the full sequence from plans to bid price, see how to estimate a construction project.
Who uses estimating services
- General contractors who bid more work than one estimator can handle, or who do not have an estimator at all.
- Subcontractors in trades such as electrical, drywall, roofing and concrete who need trade-specific quantities quickly.
- Builders and remodelers who price from plans and need numbers they can defend to an owner.
- Owner-operators with a bid due this week and a crew to run.
Many companies use a service for overflow. The in-house estimator takes the bids that need local knowledge, and the service takes the rest. We cover the trade-offs of that setup in outsourcing construction estimating.
Common pricing models
Services price their work in a handful of ways. Here is how each one usually works.
| Model | How it works | Fits best when | Watch out for |
|---|---|---|---|
| Fixed fee per project | One price for a defined scope, quoted after the plans are reviewed | You have a bid due and want a known cost | The quote should say which trades, sheets and revisions are covered |
| Per square foot | A rate multiplied by building area | Repeat building types with simple scopes | Area ignores complexity; a small, detailed job can take longer than a large, simple one |
| Hourly | You pay for time spent | Small or undefined scopes, or edits to an old estimate | It is open-ended unless you ask for an hours estimate or a cap |
| Monthly retainer | A flat monthly fee for ongoing capacity | You bid steadily every month | Ask how many bids it covers, the turnaround, and what happens in a busy month |
These are structures, not price lists. Actual rates vary by company, region, trade and scope, so be careful with any single number you read online. The reliable way to learn what your work costs is to send the same plans to two or three services and compare written quotes.
One concrete example: BidMe's prices
BidMe uses a fixed quote per project, given after the plans are reviewed and paid securely online. Residential estimates start at $200 per project and commercial estimates start at $400 per project. The final quote depends on the plans.
For contractors who bid all the time, there is a Dedicated Estimator plan at $1,999 per month.
What drives the price
Whatever the pricing model, the same few factors move the number.
- Project size. More sheets and more area mean more to measure.
- Number of trades. A whole-building estimate across many divisions takes longer than a single-trade takeoff.
- Drawing quality. Clean, scaled PDFs with schedules and specifications go faster than blurry scans, missing scales, or sheets that contradict each other.
- Level of detail. Counting every fixture, outlet and fitting costs more than carrying an allowance. It also produces a more reliable bid.
- Complexity. Curved walls, many finish types, and additions that tie into existing structure all add time.
- Turnaround. Rush work displaces other work, so it usually costs more.
- Revisions. Addenda and revised sheets mean rework. Ask how they are handled.
Why the cheapest estimate can be the most expensive
The fee is rarely where the money is lost. The loss happens inside the estimate. On one custom estate, site lighting had been carried as a lump sum of about $71,500. Counting every fixture symbol on the lighting sheet turned that line into about $194,000 of counted items, a gap of more than $120,000.
Lump sums hide under-counts. A low fee that comes with allowances in place of counts can cost far more than it saves.
What should be included
Before you compare prices, make sure you are comparing the same deliverables. A complete estimate from a service should include:
- A takeoff by trade. Quantities organized by CSI division that you can trace back to the sheets.
- Pricing. Labor, materials, equipment and subcontract items, with local sales tax applied.
- Editable files. An Excel workbook with the formulas left open, so you can change a quantity or a rate and see the total move.
- Visible markups. Overhead, profit, insurance and contingency shown as their own lines, not buried in unit prices.
- Plan markups. Color-coded drawings that show what was measured, so you can check the count against the sheet.
- Clarifications and RFIs. A written list of every assumption the drawings did not settle.
- A walkthrough. A call to go through the quantities and assumptions with you, so you understand the estimate before you sign a bid.
- A summary. A short document you can attach to a bid.
If a quote delivers only a locked PDF with a single total, you are buying a number, not an estimate. You cannot check it, adjust it, or defend it.
How to compare quotes fairly
Put every quote side by side and fill in the same columns for each.
| Check | What to look for |
|---|---|
| Scope | Which trades and sheets are covered; whether specifications and addenda are included |
| Deliverables | Editable Excel and marked-up plans, or a locked PDF |
| Pricing basis | Unit-based counts and rates, or lump sums and allowances |
| Markups | Shown as separate lines you can change |
| Revisions | Included in the fixed price, or quoted separately |
| Delivery date | A date in writing, not "as soon as possible" |
| Walkthrough | Included, and with whom |
| Confidentiality | Your drawings used only for your estimate |
Once the columns are filled in, differences that looked small on price often turn out to be large on scope.
Questions to ask before you hire
- What exactly is covered: which trades, which sheets, which documents?
- Is the price fixed, and when do I see it, before or after work starts?
- What file formats do I get, and can I edit them?
- How are labor rates set, and where do material prices come from?
- How do you handle things the drawings do not show?
- What happens when an addendum or revised sheet arrives?
- When will I have the estimate, and what if the date slips?
- Do you walk me through the result?
- Who sees my drawings, and what happens to them afterward?
A service that answers these plainly, in writing, is usually one you can work with.
Where BidMe fits
BidMe is a construction estimating and material takeoff service for general contractors, subcontractors, builders and remodelers across the United States. You send the plans, get a fixed quote with a delivery date, and receive the estimate, typically 24 to 48 hours after you approve the quote. The steps are laid out on the how it works page. Prices start at $200 for residential and $400 for commercial projects, and you can see all plans on the pricing page. To see what the work covers, read about estimation and takeoff services.
Questions contractors ask
Can an estimating service work from PDF plans alone?
Yes. PDF is the most common format. BidMe also accepts DWG files, plan-room links, and Dropbox or Google Drive links, along with specifications and addenda.
What happens if the plans change after I get a quote?
Ask this before you hire. Some services include revisions in the fixed price and others quote them separately. Send addenda and revised sheets with the plans whenever you can, so the quote reflects them.
Is a fixed fee better than hourly billing?
For a bid with a deadline, a fixed fee is easier to budget because you know the cost up front. Hourly billing can suit small edits or unclear scopes, but ask for an estimate of hours.
Will the service tell me what the drawings do not show?
It should. A solid estimate lists each assumption and open question as a clarification or RFI, so you can resolve it before you bid instead of after you win.
