What I got wrong building my own home.

I'm a designer who built his own home from scratch. I made good decisions and I made bad ones, and I live with both every day. Publishing the bad ones is uncomfortable. But a designer who only talks about what went right must not have built anything, because things go wrong. The mistakes I made on my own home are the reason I push clients harder on certain things than they might expect — and the reason those lessons are now baked into how I design.

The HVAC duct disaster

This is the one I think about most. Every day. I convinced my HVAC contractor to size the equipment the way I wanted it — right-sized based on a real load calculation, not rules of thumb. He pushed back, I held my ground, and the equipment sizing is as correct as it could be. But I didn't hold my ground on the duct installation. The ducting was run according to his standard practice rather than my design, and the results are exactly what poor duct design produces: some rooms getting far too much air, others not getting enough. The imbalance is not something that damper adjustment can fix.

The same problem exists with the ventilation system. I had the right analysis. I didn't have the confidence to require the right installation.

Then there's the rigid duct work. There's almost no flex duct in the house and sound goes in one register, through the duct, and out other registers. In most homes this noise might be masked by other noise. In a quiet house it isn't. Flexible duct connections at equipment and flexible boots at registers reduce noise transmission significantly. This is worth specifying on the drawings, not leaving to the contractor's standard practice.

"I was right about the equipment and wrong about the installation. Being right about half isn't enough to produce a home that is as comfortable as it should be."

What I'd do differently: require the contractor to install to those drawings, or provide evidence that the drawings are wrong. Commission the installation before walls and ceilings close. Commissioning is rarely done in a thorough way measuring the output at each register and calibrating the static pressure at the blower. Don't skip this, it is the only time to catch problems and fix them.

Document control failures

Two separate incidents, both caused by the same underlying failure: I had multiple versions of plan drawings in circulation on the job site and I didn't control them carefully enough.

The lighting layout

I made a change to the lighting layout upstairs before electrical rough-in. I updated my drawings and gave them to the electrician, but I didn't remove all copies of the old layout from the plan sets on site. The electrician started working off an old copy and I didn't notice until the drywall was up. It wasn't changing at that point. Now I'm annoyed with myself every time I'm reading on the couch and light is coming from just in front of me instead of from just over my head to light my book.

The kitchen switch and outlet

I made a late change to the cabinet layout. I updated the cabinet drawings but forgot to make the corresponding update to the electrical layout. The result is a switch and an outlet in a genuinely strange location in the kitchen — placed where they made sense relative to the old cabinet layout, now sitting in a spot that makes no sense relative to the current one. It's a small thing in isolation, but it's visible every time I'm in the kitchen.

The lesson from both of these incidents is the same one I write about in the entry on change orders: late changes have a costs beyond the change itself. They require coordinated updates across every affected drawing, and the coordination failure is as damaging as the change. If you make a change in design, you have to audit every drawing it touches before work proceeds.

Acoustics: the problem I didn't analyze

I didn't understand how sound would behave in my home during the design phase, and I'm still dealing with the consequences. My office has serious reverb problems — hard surfaces, parallel walls, no acoustic treatment in the design. I've addressed it with sound dampening panels, but that's a retrofit. The main upstairs living room has problems I still don't have a clean solution for. Sound bounces off the large picture window and then off the cabinetry and neither wall can be sound treated.

Rooms with hard parallel surfaces — drywall, hardwood floors, glass — create flutter echo and reverberation. Certain room sizes make this worse or limit the effect. This is predictable from the geometry and the material choices. It can be addressed in the design phase with room geometry (splayed walls, angled ceilings), material selection (acoustic ceiling tile, carpet, soft furnishings), or built-in treatment (bookshelves, fabric panels). None of those interventions are expensive during design. All of them are significantly more expensive after the fact. I analyze that in my designs now.

The solar contractor

I hired a solar contractor who turned out to be terrible to work with. Everything was a fight. The work I paid for wasn't done correctly. I ended up rewiring significant portions of the system myself. The cost — in money, time, and stress — far exceeded what hiring a better contractor would have cost from the start.

The lesson I took from this: never try to fix a contractor relationship through negotiation and pressure. Fire them instead. The moment you're spending more time managing a contractor than the work warrants, the relationship is already costing you more than ending it would. I waited too long, tried too hard to salvage the situation, and paid for it. A bad contractor mid-project is not a problem you can negotiate your way out of. Make sure things are working from the beginning or find someone else before it's too late.

Physical and siting mistakes

Solar on a 4:12 roof

A 4:12 roof pitch means that the roof mounted solar panels at a shallow angle. In winter, snow accumulates on the panels and doesn't slide off naturally until there's some real sun. Sometimes that takes a week or more. The panels are barely visible from the ground let alone reachable with a pole. I have to go up on the roof after significant storms and manually remove the snow. It is dangerous and tedious work. A steeper roof pitch would have helped significantly. If you're designing a home with solar in a snowy climate, the roof pitch is a solar design variable, not just an architectural one. I don't like steep roofs from an architectural perspective, but I would build a much steeper roof if I did this again or use a ground mount.

The $1,300 window

I ordered a 36-inch window for an opening sized for a 30-inch window in the plans. If you know about window sizing you can see how this could happen. The window cost $300. The change order to modify the rough opening when framing was complete and the roof was on cost $1,000. Ordering a new window wasn't an option. The windows were made with custom coatings and it would take weeks to get a new one. The exterior finish was about to start and was weather dependent so we had to keep moving. That window was going in one way or another. This wasn't that big of a deal as change orders go, but its definitely the most expensive window in the house.

The well location

My well is in a poor location relative to the house and the garage — it's in the path of normal daily vehicle movement and it creates friction every day. Setting aside the annoying location, the total cost of that mistake so far is around $3,500 in additional materials and labor to get power to it and water from it. Those costs are going to continue to grow if I ever install a cistern. I didn't think carefully enough about well placement when I chose where to put it and the house. Utility infrastructure placement — well, septic, propane tank, electrical service — deserves as much attention during site design as the house itself. Once it's in the ground, it's there.

The basement floor

I poured the basement floor at the top of the footer to get a ceiling 4" taller. That has caused problems for just about every trade. The cost of dealing with those complications sits at about $6,000 which is more than it would have cost to hire a guy with 10' forms to do the foundation. After all that I still don't even have as high of ceilings in the basement as I wanted.

The garage depth

The garage should have been four feet deeper. I didn't think hard enough about what I was actually going to do with the space when my workshop plan changed. Now freezers and bikes are occupying an entire parking bay and I can barely fit my wife's maxi van in to work on it. My truck doesn't fit at all. Garage depth is something most clients underestimate because they're thinking about parking cars, not about the accumulated gear, equipment, and storage that actually occupies garage space in most homes even with good storage designed in. 2 extra trusses, some concrete and more framing lumber would have cost a couple thousand dollars and I think about that every night I'm outside working on my truck in the cold.

Security lights under the gutters

I placed security lights directly beneath the gutter downspouts obviously needed to go in the plans. That won't happen with your home.

Decisions that cost real money in hindsight

The air sealing approach

My air sealing is excellent — the results prove it. But the method I used cost approximately $3,000 more than it needed to and added 20 hours of my own labor. There are approaches to continuous air barrier construction that are faster, cheaper, and less disruptive to the framing crew. I learned those approaches after the fact. The lesson isn't that air sealing was a mistake — it's that the specific method matters, and the cheapest effective method is worth knowing before you start.

Premium foam for marginal insulation gain

I spent twice the money on a higher-specification rigid foam for a marginal improvement in R-value. The thermal performance difference in the finished building was not measurable. The cost difference was real, about $4,000. There are diminishing returns in insulation beyond a certain point, and chasing them with premium materials is a poor allocation of the building budget. Spend more on air sealing. Spend more on windows. Spend less on premium insulation products above the point of meaningful return.

The barn wire

I ran wire to the barn sized for basic lighting loads and some power tools. If I ever want to run a shop out there for working on the bigger farm equipment I'll have to build out some inverter and battery infrastructure or dig a new trench to lay new wire in it. Laying heavier wire in would have cost another $1,000 at the time. Now it will cost $6,000 in inverters and batteries or new wire and trenching.

Have all design details finished before going to the engineer

I submitted the plans to the structural engineer before every detail was resolved completely. Some things can change after the engineer, but others can't and require another review which costs time and money.