Ask ten builders how long a custom home takes and you’ll get ten answers. Most of them are wrong — not because the builders are lying, but because they’re answering a different question than you’re asking.
They’re telling you how long it takes to build the house. You want to know how long until you’re living in it.
Those are not the same number, and the gap between them is where people get frustrated.
Here’s the real timeline, phase by phase, with what actually causes delays and what you can do about them.
The honest total
Plan on nine to twelve months from your first real conversation to move-in day.
Some builds go faster. Some go longer. But if you’re mapping out a lease ending or a house you’re selling, that’s the window to plan around.
The construction itself is a smaller piece of that than most people expect. A big chunk of your timeline happens before anybody breaks ground — and that’s the part you have the most control over.
Phase 1: Planning and budget — 2 to 6 weeks
Before there’s a plan, there’s a conversation. What are you building, on what land, for what number.
This phase drags when people skip it. Buyers who jump straight to floor plans without settling a budget end up designing a house they can’t afford, then paying to redesign it. That’s a month you never get back.
What moves it along: Know your number before you start. Get pre-qualified. Have a real conversation about what your budget actually buys in this market, and let the builder be honest with you about it.
Phase 2: Design and plans — 6 weeks to 4 months
This is the longest variable in the whole process, and it’s almost entirely up to you.
Working from a builder’s existing plan with modifications? Weeks. Starting from a blank sheet with an architect? Months.
It’s not the drafting that takes time. It’s the revisions. Every round trip — you look at it, you want a change, it goes back, it comes back — adds a week or two. Some families do three rounds. Some do fifteen.
What moves it along: Decide with everyone who gets a vote in the room at the same time. The single biggest delay in this phase is one spouse approving a plan and the other one seeing it a week later.
Phase 3: Engineering, bids, and permit — 4 to 10 weeks
Once plans are final, they go to engineering. Then out to subcontractors for bids. Then to the city or county for permit.
Permit timelines in the Billings area vary with how busy the building department is and whether your lot is inside city limits or out in Yellowstone County. Building season and staffing both move it. Ask your builder what they’re seeing right now — a builder pulling permits every month knows this number cold.
What moves it along: Not much, honestly. This phase mostly runs on other people’s clocks. What you can control is not changing the plans after they’ve gone to engineering. That restarts things.
Phase 4: Permit to certificate of occupancy — 4 to 8 months
This is the part people picture when they think about building a house.
Roughly how it sequences:
- Excavation and foundation — a few weeks, weather permitting
- Framing — this is when it suddenly looks like a house, and it goes fast
- Roof, windows, exterior — getting it weather-tight is the milestone that matters
- Mechanical rough-in — plumbing, electrical, HVAC, all at once, then inspections
- Insulation and drywall — the quiet stretch where it feels like nothing’s happening
- Interior finish — cabinets, trim, flooring, paint, fixtures. The longest phase and the one where delays hurt most
- Final inspections and CO
At Infinity Homes we build to a four-month standard from permit in hand to certificate of occupancy, with six months as the ceiling. That’s tighter than a lot of builders run, and it’s deliberate — every extra month is interest, carrying cost, and another month of your life in limbo.
Ask any builder you’re considering what their number is. Not their best build. Their average. And ask what happens when they miss it.
Phase 5: Closing and move-in — 2 to 6 weeks
The certificate of occupancy isn’t the finish line. There’s still a punch list, a final walkthrough, and depending on how the build was financed, a closing.
If you’re financing through a construction-to-permanent loan, conversion takes time. If the builder carried the construction loan, you’re closing like a normal home purchase — appraisal, underwriting, closing date.
What moves it along: Stay in touch with your lender through the whole build, not just at the end. Nothing stalls a move-in like a loan file that went stale.
What Montana weather actually does to your schedule
This is the part national timelines don’t account for, and it matters here.
Winter foundations cost time and money. Frozen ground has to be dealt with. Concrete needs blankets and heat to cure properly. It’s absolutely doable — builders in Montana pour foundations in January every year — but it’s slower and more expensive than a spring pour.
Framing in the cold is fine. Framing in a blizzard is not. Crews lose days. Not weeks, usually, but they add up across a winter.
Flatwork and landscaping wait for spring. Driveways, sidewalks, patios, sod, and final grade often can’t be finished in deep cold. This is important: you can get your certificate of occupancy and move in with exterior work still pending. Ask your builder up front how they handle that — how it’s held back, when it gets finished, and what protects you.
The best-case start is spring. A build that starts in April rides the good weather through the hardest phases and finishes interior work over the winter. That’s the ideal sequence. It’s also why spring is the busiest time for every builder and sub in the valley — which cuts the other way.
What actually causes delays
In rough order of how often they happen:
- Selections. Not picking cabinets, tile, or fixtures on time. This is the number one delay in custom building and it’s entirely on the homeowner. Your builder can’t order what you haven’t chosen.
- Change orders. Every mid-build change stops work, requires a new price, and re-sequences trades. One wall move can cost two weeks.
- Weather. Real, but usually smaller than people think.
- Inspections. Scheduling backlogs at the building department.
- Material lead times. Better than it was a few years ago, but specialty windows, custom cabinets, and certain appliances still run long. Order early.
- Subcontractor availability. Especially in a busy spring.
Notice that the top two are homeowner-controlled. That’s not a criticism — it’s good news. The single most effective thing you can do to keep your build on schedule is make your decisions on time.
How to keep your build on track
- Make selections before you break ground, not during. Every one you can lock early is a delay you never have.
- Order long-lead items first. Windows, cabinets, appliances, specialty fixtures.
- Get changes out of your system in the design phase. Cheap on paper, expensive in the field.
- Have one decision-maker. Or two who talk to each other before answering the builder.
- Ask for a schedule and ask how often it’s updated. A builder who can’t produce one isn’t running one.
Questions to ask before you sign
- What’s your average from permit to certificate of occupancy? Not your best — your average.
- What happens if we go past it?
- Who’s my point of contact, and how often will I hear from them?
- How do you handle winter work — do you build through it or slow down?
- What’s your selections deadline, and what happens if I miss it?
- What exterior work might be outstanding at move-in, and how is that handled?
If a builder gets vague on any of these, that’s your answer.
The bottom line
Nine to twelve months, start to finish, is a realistic plan for a custom home in Billings. Most of the variability lives in design and selections — the parts you drive.
A builder who gives you a straight answer about timing, including the parts they don’t control, is telling you something about how they’ll communicate for the next year. Pay attention to that answer more than the number itself.
Infinity Homes builds custom homes in Billings, Belgrade, Helena, and Great Falls. If you’re mapping out a build and need a realistic timeline for your situation, we’re happy to walk through it.
