Interior Designer Horror Stories and How to Avoid Them
After designing more than 1,000 custom homes and renovations, we’ve seen our fair share of interior design horror stories. While every project is different, many of the biggest mistakes have one thing in common: homeowners make major decisions before they have enough information. Whether it’s choosing a builder, setting a budget, or starting construction too early, those decisions can create unnecessary stress and cost. Fortunately, most of these situations can be avoided.
The Most Expensive Renovation Mistake We’ve Ever Seen
About three or four years ago, we designed a very nice house in Vancouver. It was a high-end project of more than 10,000 square feet, and like many homeowners, the clients were interviewing multiple builders before moving forward.
Two of the builders were companies we knew well and trusted. The third was a builder we specifically advised them not to hire based on experience. At that stage, the design wasn’t complete, so nobody could provide accurate pricing. Everyone was estimating. The two builders we trusted believed the project would likely cost around $6 million. The third builder claimed he could build it for approximately $3.5 million.
We told the homeowners that the lower number wasn’t realistic. The design wasn’t complete, and in our opinion, the builder was significantly underestimating the cost of the project.
Unfortunately, that builder was also a very good salesperson, so despite our advice, the homeowners decided to move forward with him and started construction before the design was finalized. It didn’t take long for problems to appear. Before the roof was even installed, the project was already approaching $1 million over budget due to excessive site preparation costs not budgeted for.
When everything was finally finished, the total cost landed somewhere between $6 million and $7 million, almost exactly in line with the estimates from the two builders we trusted. To their credit, the homeowners later acknowledged that we had raised these concerns from the beginning. Although these are large costs for a luxury home, we see the same situation arise for homes in the $1.5-$3.0 million range.
The lesson is simple: never start construction based on a budget that isn’t supported by completed design documents. Until the design is finalized, pricing is little more than an educated guess.
The Biggest Misconception About Residential Design
One of the biggest misconceptions homeowners have is that because they know what they want, they don’t need design help. About 95% of our clients know what they want. The problem is that they can’t turn those ideas into a complete set of documents that a builder can accurately price and build from. That’s why understanding when to hire an interior designer for your custom home or renovation is so important. The earlier those decisions are made, the more control homeowners have over design, budget, and the overall outcome of the project.
If you don’t have a well-developed design and clear plans for the builder to follow, two things tend to happen. First, the finished home doesn’t function or look the way it was intended to. Second, the budget becomes little more than a guess. Homeowners often don’t discover the true cost of their project until construction is already underway, when changes become significantly more expensive. The amount you’ll overpay through poor planning, budget overruns, and costly changes can easily dwarf the amount you thought you were saving on design.
This is when we explain our “Lego analogy” to clients. Imagine looking at a completed Lego set. You can see exactly what the finished product should look like on the box, but someone still has to create the instructions that make it possible to build it.
That’s where we come in.
As a professional residential design team, we take your ideas and turn them into a complete set of plans and specifications that a builder can accurately price and construct. Our role is to bridge the gap between a vision and a buildable project, giving homeowners the clarity they need before construction begins.
Design is often the first major expense homeowners encounter, which naturally makes them price-sensitive. A great designer might cost $20,000 more than a less experienced one. On a $2 million project, however, that’s only about 1% of the overall investment.
Designers all provide the same basic service, but experience matters. The good ones have completed hundreds of projects. In our case, we’ve worked on more than 1,000 homes and have seen the successes, mistakes, and horror stories that come with them. That experience helps us identify problems before they become expensive and gives homeowners the guidance needed to make informed decisions before construction begins.
Why We Don’t Chase Design Trends
People often ask us what design trends homeowners should avoid.
The truth is that very few of our projects are what we would consider trendy. If you look through our portfolio, you’ll find projects that are nearly ten years old and still feel current today. That’s because our goal has never been to chase whatever is popular at the moment. We focus on creating homes that feel timeless, and a large part of that comes down to how architectural style shapes the way homes feel and function long after trends have come and gone.
That doesn’t mean trends are always bad. In fact, many of the design trends we’re seeing for 2026 complement timeless architecture beautifully. The key is understanding where and how to incorporate them.
We generally encourage clients to avoid highly trendy colours, finishes, and materials in elements that are expensive and difficult to change later. Cabinetry, flooring, major tile installations, and exterior materials should be selected with the long term in mind.
However, if someone really wants to apply a trend, the powder room can be a great place to do so. In this smaller space, a bold design decision, something unique, dramatic, or completely unexpected, can have a big impact without the massive price tag if the desire comes to change it again in the shorter term.
If clients want to experiment with something highly personal, we encourage them to do it in places that are easier and less expensive to update. Wallpaper, furniture, decorative lighting, artwork, and accessories can all bring personality into a space without creating a major renovation project down the road. Thoughtful lighting choices can be particularly impactful because they influence both the atmosphere and functionality of a space.
We also encourage homeowners to think about resale value. Your home should absolutely reflect your personality, but if a design choice is so specific that very few people would appreciate it, future buyers may see it as something they need to replace rather than something they value.
Timeless design doesn’t mean boring design. It means making decisions that will still feel right years from now.
The Best Decision Homeowners Can Make
If there is one decision that consistently leads to better outcomes, it’s taking the time to fully complete the design and obtain accurate pricing before construction begins.
This sounds obvious, but it is one of the most common mistakes we see.
Many builders encourage homeowners to start construction before every detail has been resolved. Sometimes they’re trying to keep their crews busy. Sometimes they’re optimistic about the budget. Sometimes they’re simply estimating based on incomplete information. Regardless of the reason, starting before accurate pricing is available almost always increases risk.
When a project is fully designed before pricing, homeowners remain in control. If the cost comes in higher than expected, changes can be made before construction starts. Materials can be adjusted, square footage can be reduced, and details can be simplified. Most importantly, those decisions can be made thoughtfully and strategically.
Once construction begins, those same changes become much more expensive.
One of the biggest misconceptions in the industry is the phrase “over budget.” In our experience, projects are rarely over budget. More often, they were incorrectly budgeted from the beginning because decisions were made before enough information was available.
Patience is one of the greatest advantages a homeowner can have. When you invest the time to complete the design properly and obtain accurate pricing before construction starts, surprises become far less common.
The One Piece of Advice We Give Every Homeowner
If we could give homeowners only one piece of advice before they begin a renovation or custom home project, it would be this: don’t undervalue design. Whether you’re building a custom home, planning a renovation, or refining the details of an existing space, investing in professional design services can significantly impact both the final result and the overall project experience.
Most people understand that design influences how a home looks. What many don’t realize is how much it influences a project’s overall cost and success. Good design doesn’t just create a better home. It creates certainty.
Design fees typically represent a relatively small percentage of the total project budget. Let’s say design costs account for approximately 5% of the overall investment. That 5% helps you gain clarity and control over the remaining 95%.
When the design is thorough and accurate, builders can provide meaningful pricing. Trades can submit comparable quotes. Homeowners can make informed decisions before construction begins. Everyone is working from the same information.
When the design is incomplete or poorly executed, everything becomes harder to evaluate. Pricing varies dramatically. Comparisons become difficult. Changes happen during construction. Costs become less predictable.
Some homeowners view design as an area where they can save money. In reality, design is often the tool that protects every other dollar they spend on the project.
The best projects aren’t necessarily the ones with the largest budgets. They’re the ones that are carefully planned, thoughtfully designed, and accurately priced before construction ever begins.
Final Thoughts
Most interior design horror stories unfold during construction, but they are often caused by decisions that were made much earlier in the process.
Whether it’s hiring a builder based on unrealistic pricing, rushing into construction before the design is complete, or underestimating the value of professional design, the outcome is usually the same: uncertainty, stress, and unexpected costs.
The most successful projects are rarely the fastest. They’re the projects where homeowners take the time to plan properly, complete the design thoroughly, and understand the true cost before construction begins.
Good design isn’t just about creating a beautiful home. It’s about helping you make better decisions, avoid costly mistakes, and enjoy the process of bringing your vision to life.
Frequently Asked Questions About Interior Designer Horror Stories and How to Avoid Them
How can I tell if a builder’s estimate is unrealistically low?
If one estimate is significantly lower than the others, it’s worth asking why. An unusually low price may be based on incomplete information, missing scope, or optimistic assumptions rather than the true cost of the project. Before making a decision, ensure all builders are pricing the same drawings and specifications so you can make a fair comparison.
When should I involve a builder in my renovation or custom home project?
We recommend involving a builder early in the design process. Their input can help assess feasibility, discuss construction methods, and provide ballpark pricing as the design develops. However, homeowners should avoid committing to construction or relying on a fixed budget until the design is complete and the project can be accurately priced.
How do I choose between a timeless design and a trendy design?
A well-designed home doesn’t need to ignore trends entirely, but it’s important to be selective about where to use them. We often recommend incorporating trends through easier-to-update elements, such as furniture, lighting, paint colours, and décor, while keeping permanent features like cabinetry, flooring, and architectural details more timeless.
