What to Know Before Signing a Builder Contract in the Treasure Valley

A builder's purchase contract is not like a standard resale purchase agreement. It's longer, more complex, and written entirely by attorneys who represent the builder — not you. That's not a conspiracy; it's just the reality of how new construction works. The builder's contract has been refined over years of closings to protect the builder's interests across a wide range of scenarios, and it will do exactly that unless you understand what you're signing before the ink is dry.

I have a Master's degree in Construction Management from USC and have spent years specializing in new construction sales in the Treasure Valley. I've negotiated builder contracts on behalf of dozens of clients, I understand what's in them, and I know which clauses matter most and which ones give builders the most latitude. What I've watched happen to buyers who sign without fully understanding what they agreed to is the main reason I wrote this post.

New construction is a genuinely strong option for many buyers in this market — and the incentives builders are currently offering make it especially compelling. But the contract that comes with a new build is a different animal from what you sign on a resale home, and the decisions you make at the contract stage determine your experience for the next six to twelve months of construction and beyond. Here's what you need to know before you put your signature on anything. For more context on the broader new construction landscape here, see the new construction page.

The Builder Contract Is Not Negotiable — But Some Things Are

The first thing to understand about a builder's purchase contract is that the core document is written by the builder's legal team and is largely non-negotiable in its structure. You're not going to cross out clauses and get them accepted the way you might negotiate terms on a resale transaction. The builder uses the same contract for every buyer, every home, and they're not going to create a one-off custom version for you.

That said, specific terms within the contract often are negotiable — just not the legal framework around them. What the builder charges for upgrades, whether they'll extend your design center allowance, what the earnest money structure looks like, whether they'll accept contingencies from the sale of your current home, which lender you're required to use to get the advertised incentive, and the specific items included in the base price versus listed as upgrades — all of these are conversations you can have before you sign. The leverage you have is your willingness to sign or walk away. On standing spec inventory — a finished or nearly-finished home the builder is carrying on their books — you have more leverage than on a to-be-built home in a popular community where demand is strong.

Deposits: How Much, When, and What Happens If You Walk

Builder earnest money structures are different from resale transactions, and the differences matter significantly. On a resale home, earnest money is typically 1 to 2% of the purchase price and is refundable if the deal falls apart during your inspection or financing contingency periods. Builder contracts often require larger deposits — sometimes 1 to 3% upfront at contract signing, with additional deposits due at various milestones (design center selections, frame completion, etc.) — and the refundability terms are frequently less favorable to the buyer.

Read the earnest money and deposit sections of the contract carefully before you sign. Specifically, understand: how much is due at signing, whether additional deposits are required at milestones during construction, under what circumstances your deposit is refundable, and what constitutes a default on your part that would forfeit your deposit. Some builder contracts treat a financing failure differently from a buyer voluntary walkout. Some have liquidated damages clauses that allow the builder to keep not just your deposit but also any documented damages beyond it. Know your exposure before you commit your money to the transaction.

The Builder's Preferred Lender Clause

Most builders offer their most attractive incentives — rate buydowns, closing cost credits, design center allowances — contingent on using their preferred in-house or affiliated lender. This is legal and extremely common. It's also worth understanding clearly, because the builder's preferred lender is not automatically your best financing option, even accounting for the incentive.

Here's the dynamic: a builder's preferred lender exists partly to capture mortgage business and partly to give the builder more control over the transaction timeline. The lender's interest in keeping the builder happy is a real consideration that may influence how they handle your file in edge cases. On rate and terms, the builder's lender may or may not be competitive — it varies by builder and market moment. The right approach is to get a full pre-approval and rate quote from an independent local lender before you sign the builder's contract, compare that against what the builder's lender is offering with the incentive included, and make a genuine apples-to-apples calculation. Sometimes the builder's package wins. Sometimes using an outside lender and forgoing the incentive comes out ahead on total cost. Run the actual math; don't assume the incentive makes the decision obvious.

Incentives: What They're Really Worth vs. What They Sound Like

Builder incentives across the Treasure Valley right now can be significant — I've seen packages in the $20,000 to $60,000 range on standing spec inventory. Rate buydowns of 2/1 or 3/2/1 structure, closing cost credits, and design center allowances are the most common forms. But each type of incentive has a real value that's different from its face value, and confusing those two numbers is where buyers leave money on the table or make decisions based on false comparison.

A design center allowance — say, $15,000 toward upgrades — can only be spent on the builder's catalog of finishes and options, where materials and labor carry a builder markup. Your real buying power is less than the face value, and any unused portion is typically forfeited. A price reduction of $15,000, by contrast, lowers the amount you finance, reduces your monthly payment, lowers the figure the appraisal needs to support, and gives you real money flexibility that a catalog allowance doesn't. A rate buydown has genuine value if you plan to stay in the home for several years, but needs to be analyzed against the current rate environment and your specific loan amount to determine what it's actually worth in monthly savings.

Timeline and Completion Date Language

This is one of the most consequential sections of a builder contract and one of the most commonly misunderstood. Builder contracts almost universally include language that gives the builder significant flexibility on the completion date — phrases like "estimated completion," "subject to material availability," "subject to weather delays," and "subject to labor availability" that allow the builder to extend the build timeline without it constituting a breach. In the current environment — with supply chain volatility, labor competition from the Micron and data center build-out pulling skilled trades away from residential construction, and active permit backlogs in growing communities — build timeline delays are common.

The critical questions to ask and get answered in writing before you sign: What is the estimated completion date? Under what specific circumstances can the builder extend it, and by how much? Is there any sunset provision — a date after which you can exit the contract without penalty if the home is still not complete? What happens to your locked interest rate if the build runs significantly longer than projected? Most builder contracts do not give buyers meaningful recourse for timeline delays, which means you need to understand going in that the estimated completion date is a target, not a guarantee, and plan your financing and living arrangements accordingly.

Change Orders and Upgrade Pricing

The base price of a new construction home is the starting point, not the final price. Almost every buyer makes selections and upgrades at the design center that add to the contract amount, sometimes significantly. The contract should clearly specify the process for pricing and approving any changes after the initial design center selections are locked in — because change orders that come up during construction (whether builder-initiated due to a site condition or buyer-initiated because you changed your mind on something) are priced differently than design center selections and almost always carry a significant premium.

Get everything agreed to in writing before design center appointments close. The plan name, the elevation, the specific included features, any promised inclusions the sales agent verbally told you were standard — all of it needs to be in the written contract or a written addendum before you leave that sales office. Verbal commitments from a builder's sales representative are not enforceable. The contract is what's enforceable. If the salesperson told you that the fencing was included, the landscaping was covered, or a specific appliance package was standard — confirm it's written down before you rely on it.

The 1-2-10 Warranty — and What It Doesn't Cover

Most new construction homes in Idaho come with what's called a 1-2-10 structural warranty — a standard structure that covers: one year on workmanship and materials, two years on mechanical systems (plumbing, electrical, HVAC), and ten years on structural defects. This sounds comprehensive, and compared to the no-warranty reality of buying a resale home, it's a genuine advantage of new construction. But there are important nuances that buyers often miss.

First, not all warranty programs are equal. The company actually paying out on claims may be the builder directly (who may or may not be solvent or in business in ten years) or a third-party warranty insurer. Ask specifically: who is the warranty provider, and who pays out on a claim? Second, what's defined as a "defect" in the warranty language matters. Cosmetic issues that appear after the first year typically aren't covered. Warranty claims often require specific notice procedures — written notice within a specific timeframe after you discover the issue. Failing to follow the notice procedure can void your claim even for a legitimate defect. Read the warranty document before you close, not after your first problem.

Your Right to Independent Inspection

Builder contracts in Idaho typically allow buyers to conduct an independent inspection before closing, and you should absolutely exercise that right — even on a brand-new home. This surprises some buyers who assume that a new home doesn't need to be inspected because everything is new. That assumption is wrong. New construction has its own class of issues — improper grading that can lead to drainage problems, installation errors in mechanical systems, framing issues that get covered by drywall before anyone sees them, HVAC sizing problems, and plumbing configurations that aren't immediately visible — that a qualified inspector will identify and that the builder should correct before closing.

There are actually multiple inspection opportunities in a new construction build, and a thorough buyer takes advantage of more than one. A pre-drywall inspection — conducted after framing, electrical, and plumbing are roughed in but before the walls are closed — is one of the most valuable opportunities to see the structure and systems while they're still visible. The standard pre-closing walkthrough inspection is a second opportunity. Using a third-party inspector (not one recommended by the builder) for both is the approach I recommend. The cost of two inspections is negligible relative to the purchase price and the cost of discovering problems after you've closed.

Why Having Your Own Agent Matters

The builder's sales representative in the model home is a skilled professional — but they work for the builder, not for you. Their job is to help you buy a home from their employer at terms favorable to their employer. That's not a criticism; it's just the nature of the relationship. You need someone in the room who is specifically looking out for your interests, and that's what your own buyer's agent does.

In new construction, a buyer's agent who specializes in this market adds value in specific ways: understanding which builders have the stronger reputations for quality and warranty follow-through, knowing which communities have upcoming infrastructure improvements that affect value, understanding the real value of incentive packages and how to negotiate them, knowing which clauses in the builder's contract have historically caused problems for buyers, and managing the timeline coordination between your new build and your current living situation. The builder pays the buyer's agent commission in most cases — meaning this representation costs you nothing directly. Buyers who walk into a builder's sales office without their own representation and then negotiate on their own are at an information disadvantage from the moment they walk in.

Pre-Closing Walkthroughs and Punch Lists

The pre-closing walkthrough is one of the most important days in the new construction process and one that buyers sometimes approach too casually. This is your formal opportunity to document everything that isn't complete, isn't right, or doesn't match what the contract specifies — before you close and take possession. Every item you identify gets added to a punch list that the builder is obligated to complete. Every item you miss becomes your problem to deal with after closing, either through the warranty process (slower, more bureaucratic) or at your own expense.

Bring your agent. Bring your independent inspector if possible. Bring the contract and your design center selections so you can confirm that everything agreed to is actually installed. Document everything with photos — every door that doesn't close flush, every paint imperfection, every missing fixture, every finish that doesn't match what you selected. Be thorough. Builders would rather fix a hundred small things before closing than deal with warranty claims on each one separately afterward. And be realistic: there will always be items on a punch list — the goal is to get them all captured and committed to in writing before you hand over the balance of your purchase funds.

Frequently Asked Questions

Is a builder's purchase contract negotiable?

The core document structure is largely non-negotiable — it's written by the builder's legal team and used uniformly across all transactions. However, specific terms within it often are negotiable: upgrade pricing, earnest money structure, included features, choice of lender (and associated incentives), and in some cases contingency periods. Your leverage is greatest on standing spec inventory (finished homes the builder is carrying) and at quarter-end or phase close-outs when builders are motivated to move units. A buyer's agent experienced in new construction can identify which terms have historically had flexibility with specific builders.

What should I look for in a builder's contract before I sign?

The critical sections to understand before signing: earnest money amount, refundability conditions, and total deposit exposure; the preferred lender clause and what incentives are contingent on it; the estimated completion date and what language the builder uses to protect itself from timeline liability; the change order and upgrade pricing process; what constitutes a buyer default and what the consequences are; the warranty terms including who the actual warranty provider is; and your rights to independent inspection at various stages. Everything a sales representative tells you verbally about inclusions, timelines, or incentives should be confirmed in the written contract before you leave the sales office.

What is a 1-2-10 warranty on a new construction home?

A 1-2-10 warranty is the standard new construction warranty structure: one year of coverage on workmanship and materials, two years on mechanical systems (plumbing, electrical, HVAC), and ten years on structural defects. Most Idaho builders offer this structure, though the specific terms, notice requirements, and identity of the actual warranty provider vary. Before closing, confirm who pays out on claims — the builder directly or a third-party insurer — and review the specific notice procedures required to preserve your warranty rights, since failing to follow them can void a legitimate claim.

Should I get an independent inspection on a brand-new home?

Yes, absolutely. New construction has its own class of issues — grading problems, installation errors, improper framing, HVAC sizing mistakes — that occur regardless of how reputable the builder is. Two inspection opportunities exist in most builds: a pre-drywall inspection (after framing and rough mechanical but before walls are closed) and a pre-closing inspection. A qualified third-party inspector — not one recommended by the builder — should conduct both where possible. The cost is negligible compared to the purchase price and the cost of discovering post-closing problems that an inspection could have caught.

Do I need my own agent when buying from a builder?

Yes — and it costs you nothing directly in most cases since the builder pays the buyer's agent commission. The builder's sales representative works for the builder. Your own agent works for you — and in new construction specifically, brings knowledge of builder reputations, quality track records, warranty follow-through, incentive real values, contract clauses that historically cause problems, and timeline management experience that the builder's representative has no incentive to provide you. Walking into a builder's sales office without representation is an information disadvantage from the start.

What is a design center allowance and how much is it actually worth?

A design center allowance is a credit toward upgrades from the builder's catalog of finishes and options. It's worth less than its face value because catalog items carry a builder markup, and any unused portion is typically forfeited — you can't take the difference as cash. A $15,000 design center allowance is less valuable than a $15,000 price reduction, which lowers your financed amount, reduces your monthly payment, and lowers the value the appraisal needs to support. When comparing incentive packages across builders, convert every incentive to its real value to you specifically before making a comparison.

What happens if the builder doesn't finish on time?

Most builder contracts give the builder significant flexibility on completion timelines through language protecting them from "estimated" or "projected" dates, weather, material availability, and labor conditions. Buyers typically have limited contractual recourse for timeline delays in standard builder contracts. This matters most for buyers simultaneously selling a current home or whose rate lock has a fixed expiration. Before signing, ask specifically: what is the estimated completion date, what circumstances allow the builder to extend it, and whether there is any sunset provision allowing you to exit the contract if the home is not completed by a specific backstop date. Plan your financing and living situation conservatively, not optimistically.

Curtis Chism

Licensed Idaho Real Estate Agent • eXp Realty • License #SP56593

I have a Master's in Construction Management from USC and specialize in new construction sales — I've reviewed hundreds of builder contracts on behalf of clients and know where the landmines are. Learn more at weknowtreasurevalley.com/about.