What to Expect When Building a Custom Home?

Introduction

Custom home building in Portland typically takes 90 to 160 days once construction starts, and the process moves through four clear phases: design, permitting, construction, and closeout. If you know what happens in each phase — and roughly how long it takes — you can plan your finances, your temporary housing, and your patience accordingly.

We've built custom homes across the Portland metro for nearly three decades, and the biggest source of stress for homeowners isn't the work itself. Usually, it's not knowing what's supposed to happen next. This guide walks through the real timeline so there are no surprises.

Phase 1: Design and Planning

Before a single permit is filed, your home needs a finished design. This includes architectural drawings, structural engineering, and selections for major systems and finishes — things like windows, roofing, siding, and mechanical systems.

Why this phase matters more than people expect: decisions made here directly determine your permit timeline and construction cost. A design that's still changing after permitting starts is one of the most common causes of delays and unplanned change orders.

Here at De Marco Builders, we build custom homes through a design-build model, meaning the design team and the construction team are part of the same single point of accountability — rather than a homeowner managing an architect and a separate contractor as two disconnected parties. This matters at the design stage specifically because the people drawing the plans already know what's buildable, permittable, and priced accurately, so fewer changes surface later.

Phase 2: Permitting

Permitting is the phase homeowners have the least control over, since it depends on the jurisdiction, not the builder. Portland, Beaverton, Lake Oswego, and the surrounding cities each have their own review process, and timelines vary by workload at the permit office and by the complexity of the lot. What does this mean? Well, here are few things that commonly extend permitting on custom homes in this region:

• Sloped or wooded lots often require additional engineering review.
• Historic or overlay zoning districts in some Portland neighborhoods add design review steps.
• Utility connections for new construction can require coordination with the city or county separately from the building permit itself.

This is also where a design-build approach helps: when the design is developed with permitting in mind, plans are less likely to get kicked back for revisions, which is one of the most common reasons custom home projects stall before they ever break ground.

Phase 3: Construction

Once permits are issued, construction on a custom home generally runs 90 to 160 days, depending on size, site conditions, and finish level. Here's roughly what that looks like in sequence:

1. Site work and foundation — clearing, excavation, grading, and pouring the foundation.
2. Framing — the structural shell of the home goes up, and it starts looking like a house.
3. Rough-in — plumbing, electrical, and HVAC are installed inside the walls before they're closed up.
4. Insulation and drywall — walls and ceilings are closed in.
5. Interior finishes — flooring, cabinetry, trim, paint, fixtures, and appliances.
6. Exterior finishes — siding, roofing, driveway, and landscaping.
7. Final inspections — the city confirms the home meets code before it's cleared for occupancy.

At De Marco Builders, phase 3 runs on critical path scheduling, which means every task is sequenced against what has to happen before and after it, so subcontractors and materials are lined up in advance instead of a project sitting idle waiting on the next crew. This is part of how we maintain a 100% on-time completion record across more than 1,400 completed projects.

How does critical path scheduling reduce delays?

Critical path scheduling identifies which tasks directly determine the project's finish date and sequences everything else around them, so a late material delivery or a scheduling gap for one trade doesn't stall the whole job. Instead of scheduling loosely and reacting to problems as they come up, the schedule is built to absorb small slips without pushing the overall completion date.

Phase 4: Closeout and Move-In

Once final inspections pass, there's a walkthrough to review the finished home together, confirm every item on the punch list is complete, and hand over warranty information and any manuals for installed systems. This is also when you should get a clear answer on what's covered under warranty and for how long.

What Homeowners Should Prepare For Financially

Custom home costs vary widely based on lot conditions, square footage, and finish level, so we don't quote general price ranges without seeing the specifics of a project. What we can tell you: a transparent proposal should show pricing clearly enough that you understand what you're paying for, with no hidden fees and no surprise change orders showing up mid-construction. If a contractor's estimate can't explain where the numbers come from, that's worth asking about before you sign anything.

Why Homeowners Work With De Marco Builders

De Marco Builders has been a licensed, bonded, and insured general contractor in Portland for over three decades.

Here are a few things that set our process apart:

• Design-build accountability — one team responsible for design and construction, not two parties pointing fingers if something goes wrong.
• Critical path scheduling — projects move up to 10x faster than industry averages because the schedule is actively managed, not just estimated once.
• No upfront deposit required and transparent, itemized pricing.
• 1,400+ completed projects across Portland, Lake Oswego, Beaverton, Tigard, and the surrounding area, under the same ownership since day one.

Whether you're just starting to explore custom home building in Portland or you're ready to break ground in the area— including in Lake Oswego, Beaverton, or Tigard — we'd be glad to walk through your lot, your goals, and a realistic timeline before you commit to anything.

Ready to start planning your custom home? Request a free quote and we'll walk you through what your specific project would look like, phase by phase.