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Most estimating mistakes are process gaps, not math errors: quoting without seeing the site, missing items in the scope, leaving out travel, setup and cleanup time, copying an old quote without checking what changed, never writing down exclusions, and not following up. Fix them with a written checklist, job-cost review after every job and a quote that carries its assumptions and an expiry date.
Key takeaways
- Quote from the site, not from a phone description, whenever the job has unknowns.
- Count every hour you pay for, including drive time, loading, setup, cleanup and disposal.
- Write assumptions and exclusions on the quote, and put an expiry date on it.
- Compare each finished job's real hours and materials to the quote, so the next quote improves.
- Follow up on every quote you send. A quote with no follow-up often loses to the next one that arrives.
Underbidding hurts the most, but overbidding and slow bidding also cost jobs, and you never see those losses on a bill. The fifteen mistakes below show up across trades, from a pressure washing quote to a roof to a panel upgrade. Each one has what it costs in plain terms, how to tell it is happening in your company, and a fix you can start this week. No tool fixes these by itself. A spreadsheet, a field-service app or a custom system all work when the steps behind them are right. For the visit itself, use our estimate appointment checklist.
1. Quoting without seeing the site
What it costs: the surprise that shows up on day one, such as a locked gate, a steep yard, a second story or a hidden condition. You absorb the extra time or you ask for more money after the customer said yes. How to spot it: jobs that run over on days when the crew says "that was not what the customer described." Fix: decide which job types can be priced from photos and a short call and which need a visit. Ask for photos and a measurement at booking. When you do quote remotely, say so on the quote and name what you are assuming.
2. Missing items in the scope
What it costs: work you did for free, or an uncomfortable change order. How to spot it: a customer says "I thought that was included," or your crew finds a line item the quote never named. Fix: walk the whole job out loud with the customer, room by room or zone by zone, and read the scope back before you leave. Add a standard list of easily forgotten items for your trade, such as protection, haul-away, permits and touch-ups, and check each one on every quote.
3. Leaving out travel and loading time
What it costs: paid hours that bill to nobody. A job across the county with two supply stops can burn a morning before the first task starts. How to spot it: your crew leaves at seven but the work does not start until nine. Fix: build drive time, loading and supply runs into the price as a line of its own or into your hourly rate. Track the actual drive for a month, then use those averages by area. A custom CRM can store travel time per zone so the estimator does not guess.
4. Forgetting setup, cleanup and disposal
What it costs: the quiet hours at either end of a job: laying protection, hauling debris, dump fees, washing tools and the final walk-through. How to spot it: the crew finishes the main work on schedule and then needs another hour. Fix: give setup and cleanup their own lines in your estimating sheet, and add the disposal costs for your area. If the customer will handle part of it, write that down.
5. Copying an old quote without checking what changed
What it costs: old assumptions on a new job. Material costs, access and scope differ from the last house. How to spot it: a template that still names the previous customer's items, or a number that sits on a nice round figure you used last time. Fix: keep templates for speed but build in a short "what is different here" box that the estimator must fill out. Read the first and last lines of every quote before it goes out.
6. Ignoring access, stairs and parking
What it costs: slower work, extra trips and sometimes a parking ticket. Carrying materials up three flights is a different job than carrying them through a garage. How to spot it: crew complaints, or a job that takes the same hours as the ground-floor job next door. Fix: add access questions to the checklist: floors, elevators, distance from truck to work, parking limits, HOA or building rules. Ask the customer to arrange access where it affects you.
7. Not writing down exclusions and assumptions
What it costs: arguments. Without a written line saying what is not included, every unclear item gets argued on the last day. How to spot it: arguments at the end of jobs, or refunds you give just to end them. Fix: put an "Assumptions and exclusions" section on every quote, in plain language. Include what you will charge if you find hidden conditions, and how you will ask for approval first.
8. Letting a quote stay open forever
What it costs: you may be held to yesterday's material and labor costs on a job that starts in six months. How to spot it: a customer who calls back after a long gap and expects the old number. Fix: put an expiry date on every quote and say what happens after it, such as a re-check of the price. Be reasonable on small jobs. For large jobs with materials that move, write in how you handle material changes, and have a lawyer look at the wording.
9. Ignoring the cost of doing business
What it costs: margin that disappears because the price covered the crew and the materials but nothing else. Insurance, vehicles, software, card fees, warranty work and the time your office spends scheduling and invoicing all come out of what the customer pays. How to spot it: busy weeks with no money left at the end of the month. Fix: work out the monthly cost of running the company, divide it across your billable hours and build it into your rate. If you add a card surcharge, check your state's rules and the card brands' rules first, since they vary.
10. Pricing small jobs like big ones
What it costs: a one-hour fix still needs a truck, a driver, a call, a quote and an invoice. At a per-hour price it loses money. How to spot it: your most frustrating jobs are short ones. Fix: set a minimum service charge that covers the visit, and explain it on the phone before you book. Offer a package of small items on one visit so the customer gets better value and you waste less travel.
11. Skipping permits and inspection time
What it costs: delays, waiting on an inspector, a second visit and sometimes a stop-work order. How to spot it: jobs that finish but sit open for a week. Fix: learn which of your job types need permits in each town you serve, and who pulls them. Put the fee, the wait and the visit into the quote or state that the customer pays it. Requirements differ between towns, so check each one with the local office.
12. Pricing from the competition instead of from costs
What it costs: losing money to match a number you cannot see the reasons for. A competitor may leave out items, skip insurance or be working for a different margin. How to spot it: you say "I heard they charge less" more than you say "my cost on this is." Fix: price from your own costs and target margin, then compare to the market. Lose some jobs on purpose, and say what your price includes that the cheaper quote may not. A good, better, best quote gives price-focused customers a lower option without cutting your standard.
13. Sending the quote late
What it costs: the job, sometimes. A customer who has asked three companies for a number may lean toward the one that answered clearly and first. How to spot it: your quote turnaround is longer than you think. Check the time between the visit and the send. Fix: promise a day and time before you leave, and block an hour daily for quotes. Standard wording speeds the writing, so start from our estimate email templates.
14. Sending the quote and waiting
What it costs: every job that stalled because the customer got busy. Many quotes die from silence, not from a no. How to spot it: a list of quotes with no status. Fix: put two or three follow-up touches on the calendar on the day you send the quote, and cancel them as soon as the customer answers. Texts need the customer's consent first, as the TCPA guide explains.
15. Never comparing the quote to the finished job
What it costs: you repeat the same error on every similar job. Without a record of real hours and materials, the estimator relies on memory. How to spot it: nobody can say whether last quarter's jobs made money. Fix: have the crew log hours and materials per job, then compare to the quote when the job closes. Note the cause of any gap in the record. After ten similar jobs, adjust your rates. If AI helps with drafting, read AI for estimating and quotes first and check every number it produces.
Where to start
Do these three first, because they fix the most common losses:
- Mistake 7, write exclusions and assumptions on every quote. It takes five minutes to set up and prevents the worst arguments.
- Mistake 15, compare the quote to the finished job. This is how every other number gets better.
- Mistake 14, follow up on every quote. Put the dates on the calendar the day you send it.
Then add the checklist for scope and access, and review travel time next month when you have the data.
Frequently asked questions
How often should I review my estimating?
Review each finished job against its quote, and review the pattern monthly. A monthly look at the quote-to-win ratio and the jobs that ran over is enough to see where the process leaks.
Should I charge for estimates?
That is a business choice. Some companies charge a visit fee and credit it to the job, and some do not. Say your approach when the customer books.
How do I handle a customer who wants a firm number on the phone?
Give a range only if your rules allow it and you are sure of the job type, and say clearly that the written quote after a visit is the number that counts.
Do I need estimating software?
Not necessarily. Many small companies do fine with a good template and a spreadsheet. Software helps when you need to track follow-ups, reuse line items and compare quotes to actual job costs across a team.
General information for service-business owners, not legal, tax or financial advice. Rules vary by state; check with a qualified professional for your situation.