When you hire a builder, you pay for more than the work of the trades. You pay for someone to plan the job, hire and schedule subcontractors, order materials, deal with inspectors, manage the money and take responsibility when something goes wrong. Acting as your own general contractor, often called being an owner-builder, means doing that job yourself.
The appeal is the builder's overhead and profit, which can be a large sum. The catch is time, risk and financing. Census data shows owner-built homes take noticeably longer to finish than homes built by a hired contractor.[1] This guide sets out what the job involves, what you might save, what it can cost you, and how to decide whether it is right for you.
Key takeaways
- Builder overhead and profit averaged about 26% of construction cost in the NAHB 2024 survey; that is the pool of potential savings.
- Owner-built homes completed in 2025 took an average of 14.3 months from permit to completion, against 11.7 months for contractor-built homes.
- Extra months add interest and carrying costs, and mistakes, delays and higher subcontractor prices can eat into the savings.
- Check your state’s owner-builder rules and your lender’s requirements before you plan around it.
What a general contractor actually does
It is easy to underestimate the job. A general contractor on a new house typically:
- Turns the plans into a budget and schedule, trade by trade.
- Gets bids from and hires subcontractors, and checks their licenses and insurance.
- Orders materials and makes sure they arrive when needed, and protects them on site.
- Pulls permits and books inspections at each stage, and deals with failed inspections.
- Sequences the trades so each one can start when the last one finishes.
- Checks quality every day, and gets mistakes fixed before they are covered up.
- Manages the money: invoices, lien waivers and draw requests to the lender.
- Handles site safety, insurance, clean-up and temporary utilities.
- Solves the problems that come up every week.
As owner-builder you take all of this on, usually around a full-time job. Even if you hire a construction manager or consultant to help, the responsibility stays with you.
What you might save
The pool of potential savings is the builder's overhead and profit. In the NAHB 2024 survey, overhead and general expenses averaged $38,248 and profit $72,971 per house, against an average construction cost of $428,215.[2]
| NAHB 2024 average | Amount | As % of construction cost |
|---|---|---|
| Overhead and general expenses | $38,248 | 8.9% |
| Profit | $72,971 | 17.0% |
| Overhead and profit together | $111,219 | 26.0% |
You will not save all of that. Some of a builder's overhead covers things you still have to pay for, such as insurance, site supervision, equipment, a portable toilet and dumpsters. Subcontractors may also charge an owner-builder more than a builder who gives them steady work, and you will not get a builder's volume discounts on materials. A realistic saving is the markup minus those extra costs, and it varies a lot from project to project.
Use the calculator to see the difference on your house: run it once with builder overhead and profit at 26%, then at 0% with a higher contingency. The gap is your potential saving before the risks below.
Worked example (illustration only)
A 2,000 sq ft house at the NAHB average of $162 per sq ft costs about $324,000 to build. A 26% markup on that is about $84,240. Now take away what you still pay as owner-builder: insurance, site costs, perhaps a consultant, and slightly higher prices from subcontractors. Then add the cost of the extra time. If the build runs 2.6 months longer, the average gap in the Census data, and you are paying interest of about $2,000 a month on the loan by then (for example, $300,000 drawn at 8%), that is roughly $5,200 more in interest, before rent or a second mortgage. The saving is real, but it is smaller than the headline number.
The time cost: owner-built homes take longer
Census Survey of Construction data analysed by NAHB shows how long homes completed in 2025 took from permit to completion:[1]
| Who built it | Average months, permit to completion |
|---|---|
| Builder, for sale | 7.4 |
| Hired contractor, on the owner’s land | 11.7 |
| Owner, acting as builder | 14.3 |
Owner-built homes took about 2.6 months longer than contractor-built homes on average. Some of that is choice: owners may work on the house themselves, on evenings and weekends. But extra months cost money. Interest on the construction loan, rent or a mortgage on your current home, property tax and insurance all keep running. Our guide to how long it takes to build a house shows how to estimate that cost.
The risks to weigh
- Mistakes are yours to pay for. If the framer builds to the wrong dimension or the plumber misses an inspection, there is no builder to absorb the cost.
- Scheduling gaps. If one trade is late, the next may move to another job and not come back for weeks.
- Subcontractor quality. Builders know which subs are reliable. You will be hiring many of them for the first time.
- Liability and insurance. You need builder's risk and liability coverage, and you must check every sub's insurance. An uninsured worker injured on your site can be a serious problem.
- Liens. If you do not collect lien waivers, an unpaid supplier may file a lien on your house.
- Warranty. There is no single builder warranty; each trade warrants only its own work.
- Resale disclosure. Some buyers and lenders look more carefully at owner-built homes.
Licensing, permits and financing
Rules for owner-builders are set by states and local governments and vary widely. Many places let owners pull permits for their own single-family home, but may require you to live in it, limit how soon you can sell, or require licensed trades for electrical, plumbing and mechanical work. Ask your local building department what applies to you before you plan the project around it.
Financing is often the hardest part. Many construction lenders want an approved, licensed builder on the loan. Those that lend to owner-builders may ask for more experience, a larger down payment, more detailed budgets or a construction consultant. Talk to lenders early; see construction loans explained.
A middle path: construction manager
Some owners hire a construction manager or consultant for a fee to help with budgeting, scheduling and quality checks while the owner holds the subcontracts. It costs less than a full builder's markup and lowers the risk of costly mistakes. Compare it against a cost-plus contract with a builder, described in cost-plus vs fixed-price contracts.
Is being your own contractor right for you?
It tends to work best when most of these are true:
- You have construction or project management experience, or can learn quickly with good advice.
- You can be on site often, during working hours, for a year or more.
- You have trusted subcontractors, or a way to find and check them.
- The design is straightforward and complete before you start.
- Your lender will finance an owner-builder, and you have extra cash reserves.
- You can live comfortably with uncertainty and longer timelines.
If several of these are false, a builder's markup may be money well spent. Either way, the planning is the same: a complete budget, a realistic schedule and a contingency. Our land-to-move-in checklist and the cheapest ways to build a house are good places to start.
If you go ahead: practical tips
- Get at least three bids for each major trade, on the same scope, in writing.
- Check every subcontractor's license and insurance and keep copies.
- Use written contracts with each trade, including scope, price, schedule and payment terms.
- Pay against completed, inspected work, and collect lien waivers with each payment.
- Keep a daily log and photos, especially of anything that will be covered up.
- Book inspections early and be on site for them.
- Hold a larger contingency than you would with a builder, for both money and time.
- Line up a backup for each critical trade in case your first choice cannot make the date.
- Keep the lender informed early about any change to the budget or the schedule.
Owner-built homes are not unusual. In the Census highlights for 2025, 96% of owner-built homes completed that year had wood framing and 2% had concrete framing.[3] The methods are the same as any other house; what changes is who carries the responsibility, and who keeps the markup.
Plug your house size, land price and quotes into the free calculator. It uses the same NAHB 2024 averages as this guide.
Frequently asked questions
How much can you save by being your own general contractor?
The most you could save is the builder’s overhead and profit, about 26% of construction cost on average in the NAHB 2024 survey. Real savings are lower once you pay for insurance, site costs, higher sub prices and extra time.
How long does it take an owner-builder to build a house?
Owner-built homes completed in 2025 took an average of 14.3 months from permit to completion, compared with 11.7 months for homes built by a hired contractor.
Do I need a license to build my own house?
It depends on your state and local government. Many allow owners to build their own home under an owner-builder exemption, often with conditions. Ask your local building department.
Can I get a construction loan as an owner-builder?
Some lenders offer owner-builder construction loans, but many require a licensed builder. Expect stricter requirements on experience, budget detail and down payment.
Sources
- NAHB Eye on Housing: Single-Family Home Construction Time Declines in 2025 Verified (third-party copy)
- NAHB: Cost of Constructing a Home 2024 Verified
- US Census Bureau: Highlights of 2025 Characteristics of New Housing Verified
Figures last checked October 18, 2026. National averages are a planning guide, not a quote. See our editorial policy and data sources.
