I spent thirteen years as a software engineer before I became a home designer, and the most transferable thing I brought with me was an understanding of what happens when you make decisions late in a project. In software, there's a concept called the cost of change — the idea that a defect found in the requirements phase costs almost nothing to fix, a defect found in development costs ten times as much, and a defect found after deployment can cost a hundred times what it would have cost to catch early. Every project manager in the industry knows this curve. Most homeowners building a custom home have never heard of it.
But the curve applies to houses more ruthlessly than it applies to software. In software, you can at least patch a release. You can push an update. You can refactor. In a house, once concrete is poured, it's poured. Once walls are drywalled, opening them costs real money and real time. Once the HVAC rough-in is done, redesigning the duct layout means tearing out work that's already been paid for. The cost of changing your mind accelerates as construction advances, and at some point it becomes effectively irreversible.
"Unlike software, where you can release a new version, you can't release a new version of a house. This may be the last one you ever build."
What this means in practice is that the most valuable time you spend on a custom home project — the time with the highest return on investment, by a significant margin — is the time spent making decisions before a single shovel of dirt is moved. And yet that's the phase most first time home builders try to avoid it seeing it as an unnecessary expense rather than the actual work of building a good home.
What a change order actually costs
A change order is a formal modification to an existing construction contract. When something changes from what was originally specified — the homeowner wants a window moved, a wall added, a kitchen layout revised — the general contractor issues a change order documenting the additional labor and materials required, plus their margin. Change orders are how contractors recover costs they didn't plan for, and they're almost always more expensive than whatever they're modifying would have cost if it had been decided correctly in the first place.
The reasons are straightforward. A contractor bidding a project prices labor and materials based on a known sequence of work. Moving a window after framing means: the rough opening has to be recut, potentially destroying framing members that need to be replaced, the exterior sheathing has to be patched, the flashing has to be redone, and any interior work adjacent to that wall has to be coordinated around the repair. What would have cost nothing to specify differently on paper now involves several trades, several days of work, and a contractor who is charging for the disruption to their schedule in addition to the actual labor.
A number to keep in mind: A common rule of thumb in residential construction is that a change order costs two to three times what the same decision would have cost if made correctly during design. For structural changes — moving load-bearing walls, altering the foundation, changing roof geometry — the multiplier is higher. For changes that require redoing already-finished work, higher still.
I've heard from people who hired a designer willing to produce drawings quickly with minimal discovery — who spent three or four weeks in design, paid a few thousand dollars, and moved confidently into construction. Months later, they're describing change orders that together exceed what a thorough design process would have cost by a factor of five or ten. The money they saved on design didn't disappear — it migrated into the change order line of the construction budget, where it cost more and produced less.
The decisions that hurt most when they're made late
Not all decisions carry the same change order risk. Some things are easy to adjust during construction with minimal cost — paint colors, fixture selections, hardware choices. These are finish decisions, and they can reasonably wait. But a significant category of decisions becomes extremely expensive once construction is underway, and these are the ones that need to be resolved before anything is built.
Floor plan and room adjacency
The moment framing begins, your floor plan is no longer a sketch — it's a physical reality being built with structural lumber. Moving a wall after it's framed means paying to tear it out, disposing of the materials, reframing in the new location, potentially modifying the roof structure above it, and re-routing any mechanicals that ran through or beside the original wall. If the wall is load-bearing, add structural engineering time and a beam. The floor plan needs to be right before the first stud goes up.
HVAC system design
Ductwork runs inside walls, floors, and ceilings. Once those are framed, insulated, and drywalled, the duct routing is set. A significant redesign of the HVAC system after rough-in means opening finished surfaces, rerouting sheet metal through spaces that are now constrained by other systems, and doing it all on a construction schedule that doesn't have slack for it. The HVAC plan needs to be complete and coordinated with the architectural drawings before the mechanical contractor starts work — which means it needs to be complete well before that, because the structural framing needs to accommodate the duct runs.
Electrical layout
The rough electrical phase — running wire through walls before drywall — is when the electrical layout becomes real. Adding an outlet or moving a switch after drywall means fishing wire through finished walls, cutting holes, patching drywall, repainting. It's not impossible, but it's annoying and expensive relative to specifying it correctly before rough-in. Deciding during design exactly where every outlet, fixture, and switch belongs costs nothing. Deciding after drywall costs significantly more.
Window placement
Windows are structural holes in the building envelope. Every window requires a header sized to span the opening and carry the load above it. The framing around each window is specific to its location and size. Changing a window's location after framing means modifying the structural opening, which affects the header, the king studs, the jack studs, and any sheathing that's already applied. Changing a window's size may also affect the structural calculation for that opening. Window placement decisions — where they go, how large they are, what they frame as a view — need to be made during design.
Why most clients make decisions late anyway
Most people who build a custom home for the first time underestimate how many decisions are involved. They have a picture in their head — the general feel, the rough layout, the style — but they haven't thought through the specifics that turn a picture into a building. Honestly, they can't. They have never done this before. When the designer produces drawings quickly and moves to construction without pressure-testing the details, those specifics get deferred. They don't disappear. They resurface mid-build, under time and financial pressure, when the contractor is waiting for an answer and the schedule can't absorb delay.
The other common pattern is decision fatigue. There are hundreds of decisions in a custom home build, and when they're spread across the construction timeline instead of front-loaded into the design phase, they compound. By month three of an eight-month build, clients who didn't complete thorough design work are making significant decisions weekly — not because they want to, but because the build demands it. Those decisions get made quickly, under stress, without the time to consider alternatives. That's how you end up with a kitchen that works, but not quite right, or a master bathroom that was rushed and shows it.
"The goal is to get as many decisions made as possible before anything is built — when changing your mind costs little."
What thorough discovery actually looks like
My discovery process is paid — $500, credited to the project total — and it takes one to three sessions of one to two hours each, depending on the complexity of the project and how much thinking the clients have done beforehand. That might sound like a lot of time to spend before a single drawing is produced. It isn't. It's the time required to understand the project well enough to design it correctly.
In discovery, I'm not asking about finishes or fixtures. I'm asking about how the family moves through a house during a typical Tuesday. I'm asking where the mud goes when the kids come in from outside. I'm asking about the primary cook's relationship to the people gathering in the kitchen while dinner is being made — do they want to be part of the conversation or do they want separation? I'm asking about the next ten years: will children still be at home, will parents need to move in, will work-from-home remain a permanent feature of daily life?
These questions take time to answer well. But the answers determine the floor plan. And the floor plan, once built, is permanent.
One useful exercise: Before any design conversation, walk through your current home at a normal pace on a normal day and notice every workaround you've built into your routine — the counter you set things on because there's nowhere logical for them, the path you take around furniture, the room that's slightly wrong in a way you can't quite name. Those observations are direct inputs to designing a home that doesn't repeat the same mistakes. I ask clients to do this before our first session.
The math is not close
A thorough design process costs more upfront than a minimal one. The discovery is paid. The drawing package takes longer to produce and therefore costs more. For a high-performance home, the drawings include details — air sealing specifications, HVAC load calculations, detailed electrical plans — that a schematic package doesn't contain. All of that takes time and costs money.
But the comparison isn't between a thorough design process and a minimal one. The comparison is between a thorough design process and a minimal one plus the change orders that the minimal process generates. When you account for the full cost — including the decisions that had to be made under construction pressure, the work that had to be redone, and the things that couldn't be changed at all and are simply lived with — the thorough process is almost always cheaper. And the home is better, because the decisions were made deliberately rather than under duress.
I've never had a client tell me we spent too much time in discovery. I've had clients tell me, after moving in, that they wish we'd spent more.