The land writes the first draft
Every lot comes with conditions that no floor plan can ignore. Slope decides whether a walkout basement is natural or forced. Soil decides what kind of foundation the engineer will specify. Where the road, power and water sit decides how far the driveway and utility trenches run.
Parts of Colorado have expansive clay soils that swell when wet and shrink as they dry. A geotechnical report, drilled and written by a soils engineer, tells the structural engineer what the ground will do. Buying land without one, or designing before it comes back, invites a foundation redesign later.
Rural parcels raise their own questions: whether a well permit is available, whether the soil will accept a septic system, and whether the lot sits in a wildland-urban interface area where some jurisdictions require ignition-resistant siding, roofing, vents and defensible space. Higher sites carry heavier design snow loads, which affect roof framing, overhangs and the size of headers over big openings.
- A current boundary survey and any recorded easements
- A geotechnical or soils report for the building envelope
- Utility availability: sewer or septic, water tap or well, electric, gas or propane
- Covenants, HOA design guidelines and any architectural review steps
- Sun path, prevailing wind and views, which shape window placement and glare
Who sits at the design table
A custom home usually involves an architect or residential designer, a structural engineer, often a civil engineer for grading and drainage, and sometimes an interior designer. The builder is part of that group too, and the earlier a builder joins, the sooner drawings get tested against real costs and real construction sequences.
There are two common arrangements. In design-bid-build, the architect completes the drawings and several builders price them. In a design-build or early-involvement arrangement, the builder works beside the architect from schematic design onward, flagging details that are hard to build and materials with long lead times. Either can work. The real question is when you want pricing feedback: at the end, or while the design is still easy to change.
What each consultant owns
The architect owns the plan, the massing and the drawings the building department reviews. The structural engineer owns foundations, beams, shear walls and the roof framing that carries snow. The civil engineer owns grading and drainage away from the house. Knowing who owns which decision keeps questions from bouncing between offices.
How this kind of work usually sequences
- 01
Site evaluation
Survey, soils report and utility research tell the team what the land allows. This is the right moment to confirm covenants and HOA requirements.
- 02
Schematic design
The architect tests the plan, massing and placement on the lot. Early pricing feedback keeps the design inside a realistic budget.
- 03
Design development and engineering
Structure, mechanical systems and exterior details are drawn out. Major selections are made so the drawings can be priced accurately.
- 04
Pricing and contract
The builder prices the drawings and the owner chooses a contract structure. Allowances and exclusions get read line by line.
- 05
Permits and review
The local building department reviews the drawings, and any HOA design committee gives its approval. Requirements vary by jurisdiction.
- 06
Construction and closeout
Foundation, framing, rough-ins, inspections, insulation, finishes and a final walkthrough. The owner receives documentation for the systems in the house.
A general sequence for this type of project, not a fixed schedule.
How the contract handles the money
Custom homes are usually built under one of three structures: a fixed price, cost-plus with a fee, or a guaranteed maximum price. Each one assigns risk differently and shows the owner a different amount of detail. The homepage section on how contracts are priced walks through the mechanics; the table below compares them side by side.
Allowances deserve close reading under any structure. An allowance is a placeholder amount for something not yet selected, such as tile, plumbing fixtures or appliances. If the allowance is set low, the contract looks lean and the overage shows up later. Ask how each allowance was set and what it would buy today.
| Contract type | Who carries cost risk | What the owner sees | Fits best when |
|---|---|---|---|
| Fixed price | The builder, for work shown on the drawings | A single number and a list of allowances and exclusions | Drawings are complete and selections are mostly made |
| Cost-plus with a fee | The owner, since actual costs pass through | Invoices, receipts and the fee calculation | The design is still evolving or the owner wants full visibility |
| Guaranteed maximum price | Shared: the builder covers overruns above the cap | Open costs up to an agreed ceiling | The owner wants transparency with a defined upper limit |
Decisions that belong before the permit
Some choices can wait until framing. Others change the foundation, the structure or the mechanical layout, and moving them later means tearing out finished work.
The envelope is where long-term performance is won or lost. Window flashing, roof-to-wall intersections, deck ledgers and penetrations through the siding are the usual sources of water trouble. The homepage covers the six joints where houses leak and what sits behind a stone wall, and both are worth reading before you approve exterior details.
- Foundation type: full basement, walkout, crawlspace or slab, as the soils report allows
- Heating and cooling: forced air, hydronic radiant, heat pumps or a combination
- Ventilation strategy for a tight house, often a balanced system with heat or energy recovery
- Window package and how each unit is flashed into the wall
- Roof shape and material, chosen with snow, hail and wildfire exposure in mind
- Electrical capacity for future needs such as vehicle charging or solar
Questions worth asking any custom builder
These questions apply whoever you hire. The answers show how a builder thinks about risk, communication and change, which a portfolio photo cannot.
- How are change orders priced and approved, and how fast do they reach me in writing?
- Who is on site day to day, and who do I call when something looks wrong?
- How do you track the budget against allowances during construction?
- Which inspections happen beyond the ones the building department requires?
- What does the closeout package include: warranties from manufacturers, manuals, as-built notes?
Common questions about custom homes
Do I need to own land before talking to a builder?
No. A builder can often help evaluate a lot before you buy it, looking at slope, access, utilities and what a soils report might reveal. If you like your current neighborhood, also price out an addition to the house you already own.
Should I hire an architect first or a builder first?
Either order can work. Hiring an architect first gives you full design freedom, and bringing a builder in early gives you cost feedback while changes are still cheap. Many owners now do both at once so the design and the budget develop together.
How finished do the drawings need to be before pricing?
A fixed price needs drawings that are close to complete, with major selections made. A cost-plus contract can start with less detail because costs are tracked as they occur. The less that is decided, the more the final cost depends on allowances.
Can I change things once construction starts?
Yes, through change orders. Each one should state the added or reduced cost and any effect on the schedule before the work proceeds. Changes that touch structure, plumbing or electrical are easiest before rough-in inspections and hardest after drywall.
What makes building in Colorado different?
Soils, snow and sun. Expansive clay in some areas shapes foundation design, snow loads increase at higher sites, and strong high-altitude sunlight is hard on finishes and south and west glazing. Hail along the Front Range also affects roofing and siding choices.
