Building a new luxury home or taking on a major renovation is one of the most meaningful investments most people ever make. It’s also complex, involving interconnected decisions, multiple professionals, and a significant money commitment over a project timeline that lasts several months.
This can be a source of very understandable worry. Some risks — weather, permitting delays, what’s hiding behind an old wall, where material costs go next quarter — are genuinely outside your control.
However, GMT Home Designs has spent more than 20 years working to deliver delightful custom homes and major renovations in New England, and our track record is built on managing the things that you can manage.
Here’s where homeowners have real opportunities to mitigate risks and help ensure the best possible outcomes. Choosing the right team is where you start; understanding key budget and contract details is next.
1. To find the right design and build team, ask the right reference questions
Your relationship with your chosen design and construction partners is the biggest single success factor. Most homeowners ask for references, but few actually call them — and fewer still ask the questions that matter.
When you do reach out, skip broad, generic questions like “How was your experience?” Ask: Did the project come in near the original budget? How did the builder handle it when something went wrong? And ask the one question that cuts through polite answers: Would you hire them again?
A satisfied client answers that last one without hesitation. A pause tells you something no reference letter ever would. See the next point as well! (We wrote all about reference checks here.)
2. Hire for communication, not just craft
Every builder you’re seriously considering can build. The real question is how they’ll behave when something doesn’t go according to plan (and for large projects, something generally does; that's the nature of large, complex construction work).
Proactive, honest, and detailed communication is the most important way to reduce risks and solve challenges. When an issue surfaces and you hear about it immediately, with a proposed solution, you have options. If you find out three weeks later, you’re in reaction mode.
Include this in your reference checks, and also ask builders directly how they communicate during construction. A real answer is specific — update frequency, how they document decisions, what you’ll hear when a subcontractor has a conflict.
If you have poor communication with your team, you'll have a stressful project. We can't say this enough!
3. Work with an architectural designer who knows what things cost
Design without cost awareness is its own category of risk. Plans can be beautiful, fully permittable, but completely disconnected from your budget.
This isn't something you want to discover only when contractor bids come back.
Ask your design firm directly how they track budget during the design process. A firm that does this well can tell you immediately, because they’ve done it on project after project. A firm that hasn’t will give you a vague answer about value engineering after the fact.
4. Look for creative problem-solving, not just design skill
Challenges come in many forms, whether it’s changing material costs and availability or unexpected load-bearing walls and immoveable ductwork. A design firm’s response separates good from great.
A less experienced firm redesigns by subtraction — so you get less house. A firm with deep experience redesigns by substitution: they find the version of your vision that fits the new constraint without losing the things that actually matter to you.
This skill shows up before any crisis arises, too. It could be a ceiling detail that achieves the same sense of volume at a fraction of the cost, or a space repurposed and reconfigured instead of requiring an addition, or a finish material that reads identically to your first choice but is easier to source.
Ask your design firm to walk you through a project where budget or site constraints forced a pivot. How they answer, whether they can get specific, and whether they even light up a little tells you whether this capability is real.
At GMT, we actually relish the chance to find alternate approaches that still achieve our clients' desired goals. A creative challenge is rewarding. Over time we've zeroed in on our formula for reducing our clients' risk:
creative problem solving + buildable plans + detailed execution and communication
5. Address contingencies in your contract
A contract doesn’t prevent all problems. It helps resolve them. Your relationships with your designer and builder matter more than the paperwork, but the paperwork still matters!
The specific language worth scrutinizing includes:
- How are unexpected site conditions handled?
- What triggers a change order, and what’s the approval process?
- What happens if an expected subcontractor has to be swapped out?
- Is there an escalation clause that defines how significant material cost increases mid-project are addressed?
Some of these provisions don't come up on many projects. Where they do, they matter enormously.
6. Reality-check your allowances before you sign
A construction allowance is a placeholder in your contract — a budgeted estimate for a selection you haven’t made yet. They’re standard practice. The problem is when they’re set too low, either through genuinely optimistic estimating or to make a bid look more competitive than it is.
Before you sign, visit the showroom. Look at tile, plumbing fixtures, lighting, and appliances in the context of what you actually want. Get real prices. Then compare those numbers to the allowances in your contract. If your taste runs $12,000 in a category with a $3,500 allowance, that gap is coming back as a change order — just later, when you have less flexibility.
7. Budget a real contingency, with specific numbers
Budgeting "a little extra” is not a great risk management strategy, because it isn't specific.
- For renovation work on an existing structure, build in a 15–20% contingency above your project cost.
- For new construction on a well-investigated site, budget 10–15% above project cost.
This reserve is what lets you absorb an uncontrollable event (unexpected ledge in the excavation, an uncontrollable event, or for a material or selection that you want to splurge on). The homeowners who have the hardest experiences are almost always the ones who budgeted to the penny, with nothing available for surprises or contingencies.
8. Understand what tariff volatility means, and what you can do about it
Construction material costs have risen faster than the rate of general inflation. The NAHB’s April 2025 survey found that recent tariff actions had added an estimated $10,900 per new home in cost, with more than 60% of builders reporting higher material costs as a direct result.
Three practical steps:
- First, understand whether a proposed contract is fixed-price or cost-plus, and what happens under each scenario if a key material category jumps significantly mid-project. (And conversely, if that material cost declines.)
- Second, ask specifically whether the contract includes an escalation clause — language that defines how material cost increases are handled if they exceed a threshold.
- Third, for specific items you’ve already selected with long lead times, ask your builder about procuring them early to lock in current pricing before the next policy move.
None of these actions eliminates the risk entirely. But they can help understand possible scenarios, avoid surprises, and limit how much of the risk lands on you.
9. Lock in decisions that relate to product lead times and rough-in work
Many finishing details are rightly handled by allowances. Some decisions, though, can cause delays if they’re put off, such as:
- specific appliance models, because a 48-inch range versus a 30-inch changes cabinet layout and utility rough-ins, and ventilation hood type determines whether and where you need a vent in the roof
- specific window and door units, because the product choice determines exact rough opening dimensions, and quality window units quite often require 10 weeks or more between order and delivery
- non-standard plumbing rough-ins — think freestanding tubs, body spray systems, pot fillers — that have to be designed before walls close
- and systems like geothermal heating or radiant floor heat, decisions that should be made before concrete is poured.
GMT Home Designs has worked on custom homes, additions, and complex renovations for more than two decades, helping New England homeowners achieve their dreams on time and on budget. Contact us today about your dream project.