What is the rule of thumb for construction costs?
The most common rule of thumb in construction is that labor should run 25 to 35 percent of total project cost, materials 40 to 50 percent, and the remainder covers subcontractors, equipment, and overhead. These percentages shift depending on the type of work. A framing crew building new construction will have higher labor ratios than a general contractor managing subs on a commercial buildout.
Another widely used rule is the 10 percent contingency buffer. Add 10 percent to your estimate for unexpected costs. Remodeling and renovation work often needs 15 to 20 percent because opening walls reveals problems you couldn’t see during the walkthrough. New construction is more predictable but still benefits from a cushion for material price swings and weather delays.
For markup and profit, many contractors follow a gross margin target of 20 to 30 percent. That means after paying for labor, materials, and subs on a project, you should have 20 to 30 percent left over to cover overhead and profit. Net profit after overhead typically lands between 5 and 10 percent for well-run construction businesses. Anything below 5 percent means you’re working hard for almost nothing.
The rule of thumb for materials markup is 10 to 15 percent above your cost. Some contractors make the mistake of passing materials through at cost, treating it as a favor to the client. You’re still handling procurement, delivery coordination, and storage. That effort deserves compensation.
These rules only work if you know your actual numbers. A contractor who thinks labor is running 30 percent but is actually at 42 percent will underbid every job. That’s where proper job costing becomes essential. Without tracking costs by project, you’re guessing at ratios instead of measuring them.
The contractors who struggle most are the ones bidding based on gut feel and industry averages without knowing their own cost structure. Your labor costs depend on your crew’s efficiency. Your material costs depend on your supplier relationships. Your overhead depends on your equipment, vehicles, and insurance. Track your costs by job, compare actual to estimated on every project, and build your own rules of thumb based on real data. The industry averages are a starting point. Your historical performance is the truth.
A bookkeeping service that understands construction can set up the tracking systems to measure these ratios accurately. Without that foundation, you’re flying blind on pricing and wondering why some jobs feel profitable but the bank account tells a different story.
Full-Charge Bookkeeping for Mid-Mo's Businesses
The Next Step:
Get Your Quote
Tell us what you're dealing with. We'll listen, ask a few questions, and give you a straightforward price that meets your expectations.
More Questions
What is the IRS rule for receipts for business expenses?
The IRS requires receipts for expenses of $75 or more, except lodging which always needs a receipt. But you still need to document every business expense regardless of amount.
Read answerHow to do bookkeeping for a contractor?
Contractor bookkeeping centers on job costing. Every expense, labor hour, and payment needs to connect to a specific project so you can see which jobs make money and which ones lose.
Read answerCan I write off daycare as a business expense?
No. Daycare is a personal expense even if it enables you to work. However, the Child and Dependent Care Credit provides tax relief for qualifying childcare costs on your personal return.
Read answerHow do I organize records for a veterinary practice?
Separate revenue by service type and product sales, track inventory for medications and supplies, and reconcile daily transactions from your practice management software. Structure your chart of accounts to match how the clinic actually operates.
Read answerIs a bookkeeper different than an accountant?
Yes. Bookkeepers handle the ongoing work of recording transactions, reconciling accounts, and keeping your books current. Accountants handle tax preparation, financial analysis, and strategic advice. Most small businesses need both.
Read answerWhat proof do I need for business expenses?
Keep receipts showing the amount, date, vendor, and what you bought. For meals and travel, also document the business purpose. Bank statements alone won't satisfy the IRS if you're audited.
Read answer
