DFW New Construction Buyers: Should You Take a Builder ARM?
Adjustable rate mortgages are back. I sat down with a lender who works with builders across DFW to talk through what that means for buyers looking at new construction right now. ARMs got a bad reputation after 2008, and I wanted to understand whether the ones builders are offering today are actually different or just another way to move inventory when rates are high and margins are tight.
We covered how ARMs work now, why builders are spending money on them instead of other incentives, and what happens when the fixed period ends. If you are comparing a 3.99% ARM to a 6.5% fixed rate and trying to figure out which one makes sense, this is the conversation you need to hear.
Table of Contents
How Adjustable Rate Mortgages Work Today
An ARM is fixed for the first period, usually 5 or 7 years depending on the product. When you see a 7/1 or 5/6 ARM, that first number is how long your rate stays locked. Most people only stay in their homes for 5 to 7 years anyway, so you are getting a lower rate for the entire time you actually live there.
After that fixed period, the rate adjusts based on the market. The second number in the name is the adjustment period. A 7/1 ARM adjusts every year after the first 7 years. A 5/6 adjusts every 6 months after the first 5 years.
The big difference between now and 2008 is the caps. ARMs today have a maximum adjustment of 1% up or down per adjustment period. If you start at 3.9% and the market is at 6% when year 8 hits, your rate only goes to 4.9% that first year because of the 1% cap. The next year it could go to 5.9%, but only if the market stays that high. If rates drop, your rate drops too. The lifetime cap is usually 5% above your starting rate, so a 3.9% ARM could max out at 8.9%, but it takes years to get there because of the annual caps.
Every time the rate adjusts, it adjusts on your current balance, not the original loan amount. If you borrowed $450,000 and you have been paying extra toward principal, the adjustment happens on whatever you owe at that point. A 30-year fixed mortgage calculates your payment on $450,000 for 360 months no matter what. An ARM recalculates on the lower balance, which can offset some or all of the rate increase.
Qualifying for an ARM
Qualifying depends on the term. For a 5-year ARM, you have to qualify based on a formula that uses the index and the margin, not the note rate. If the index is 1 and the margin is 4, you qualify at 5% even if the note rate is 3.9%. For a 7-year ARM, you qualify on the note rate itself because the fixed period is longer. If the rate is 3.9%, that is what you qualify at.
There is no prepayment penalty. You can refinance out of an ARM anytime just like you would with a fixed-rate loan. If rates drop in year 4, you refinance. If you sell in year 6, the ARM never adjusts and you saved money the entire time you owned the home.
Why Builders Are Offering ARMs Right Now
Builders offer ARMs when the cost to buy down those rates becomes affordable for them. A few months ago, ARMs were more expensive to buy down than fixed rates, so builders did not touch them. The cost fluctuates with the market. Right now, builders can get deeper into an ARM rate with the same amount of money they would spend on a fixed-rate buydown.
If a builder is spending points to buy your rate down from 6.5% to 5.5% on a 30-year fixed, that same amount of money might get you to 5% on an ARM. The builder gets more marketing impact for the same spend. A 3.99% rate advertised across a portfolio draws more attention than a 5.25% rate, even if only a few homes qualify for it.
Some builders buy forward commitments on mortgage money. They pay millions of dollars upfront to lock in a set cost, then hold that money available for buyers until it runs out. That arrangement has to be in place before any individual contract, which is why it is called a forward. The builder is not negotiating those dollars as part of your specific deal, so they do not count against interested party contribution limits. You can still negotiate additional seller concessions on top of the forward money, but the builder has already spent a chunk of their margin on that rate.
Forwards expire. If the builder does not use the money, they lose it. That is why you see aggressive pushes on specific inventory. A builder might have $1 million in forward commitments, which covers maybe two $500,000 homes. They have 75 homes to sell across 10 or 15 communities, but that million dollars is tied to moving specific units. If you do not like one of those homes, the builder might not be able to offer the same rate on a different lot because the money is already allocated.
Marketing vs Margin
Builders are strategic about how they spend. A low advertised rate gets people in the door even if most buyers do not end up taking it. Some builders will only offer an ARM on 5 specific homes across their entire portfolio because those are the ones that have been sitting the longest. If you want a different lot or floor plan, you are back to negotiating standard concessions, and the builder might not go as deep because they already spent their marketing dollars elsewhere.
The cost to buy down an ARM changes week to week. Builders watch it constantly and adjust what they offer based on what is affordable at that moment. When ARMs get expensive again, they will stop offering them and go back to temporary buydowns or closing cost credits.
The Math on Savings and Risk
If an ARM saves you $200 a month and you stay in the home for 7 years, that is $16,800 in savings. Even if you refinance in year 7 and it costs $3,000, you are $13,000 ahead. If you take that $200 a month and put it toward principal instead of spending it, you reduce your balance by $16,800 plus whatever you would have paid anyway. When the rate adjusts, you might not see any payment increase at all because the new rate is calculated on a lower balance.
The risk is that rates go up and you do not refinance or sell. If you start at 3.9% and the market is at 6% in year 8, your rate goes to 4.9%. Year 9 it could go to 5.9%. If you are still in the home and rates stay high, you are paying more than you would have with a fixed rate. But you also saved $16,800 in the first 7 years, so you have to do the math on whether the higher payments in years 8 and 9 wipe out those savings.
Most people refinance or sell before the adjustment happens. The average homeowner moves every 5 to 7 years. If you know you are relocating for work or upsizing in a few years, an ARM makes sense. If you plan to stay in the home for 15 or 20 years and you want payment certainty, a fixed rate is safer.
What Happens at Adjustment
The rate adjusts to the market, but it does not jump straight there. If you start at 3.9% and the market is 6%, the first adjustment takes you to 4.9% because of the 1% annual cap. The second year it could go to 5.9%. If rates drop to 5% in year 10, your rate drops to 4.9%. ARMs go up and down. The 1% cap is a maximum, not a guarantee. If the market is only half a percent higher, your rate only goes up half a percent.
The lifetime cap is 5% above your starting rate. A 3.9% ARM maxes out at 8.9%. It would take 5 years of consecutive 1% increases to hit that ceiling, and rates would have to stay high the entire time. If rates drop at any point, the adjustment resets lower.
ARMs vs Temporary Buydowns
A temporary buydown spreads builder money over 3 years to lower your payment in the early years. A 3-2-1 buydown reduces your rate by 3% in year one, 2% in year two, and 1% in year three, then you pay the full note rate after that. If the builder is giving you $15,000, you can take it as a temporary buydown or you can take it all upfront as a permanent rate buydown or closing cost credit.
I would rather have the $15,000 today. A temporary buydown is an allowance from the builder that you do not control. You get lower payments for 3 years, but you do not capture the full value of that money because it is spread out and you cannot redirect it. If you take the $15,000 as a permanent buydown, you lower your rate for the life of the loan. If you take it as a closing cost credit, you can use it however you need.
Temporary buydowns made sense when rates were lower and builders did not have as much margin to spend. Now that rates are higher and builders are offering deeper concessions, permanent buydowns and ARMs give you more value for the same dollars.
Down Payment Assistance and VA Loans with ARMs
You cannot pair down payment assistance with an ARM. Down payment assistance programs are run by third-party agencies, usually federal or state, and they only offer standard fixed-rate loans. If you take down payment assistance, you take the interest rate that comes with it. Those programs charge a higher rate because that is how they recoup the down payment money they gave you.
But you can use builder money to buy down the down payment assistance rate. The builder cannot contribute toward your down payment directly because of interested party contribution rules, but they can cover closing costs and rate buydowns. If you are using down payment assistance and the builder is giving you $15,000, you can use that money to buy the rate down even though the down payment itself came from the third-party program.
VA buyers can use ARMs. The structure is the same as conventional and FHA. The rate is fixed for 5 or 7 years, then it adjusts with the same caps and floors. VA ARMs have the same lifetime limits and the same 1% annual adjustment cap. If you are a VA buyer and the builder is offering a 3.99% ARM, it works the same way it would for a conventional buyer.
Interested Party Contribution Limits
Interested party contribution is a federal guideline based on loan type and down payment. On a conventional loan with less than 10% down, the seller can contribute up to 3% of the purchase price. With 10% or more down, the limit is 6%. FHA allows 6% regardless of down payment. VA allows 4%.
If you are buying a $400,000 home and putting 5% down, the builder can give you $12,000 in closing costs and rate buydown. If they are offering more than that, the extra money has to come from a forward commitment or a price reduction. You cannot use more than the cap even if the builder is willing to give it to you.
That is why builders buy forwards. The forward money does not count as an interested party contribution because it was purchased before your contract existed. The builder can still offer you the full 3% or 6% on top of the forward rate, but they are pulling from their margin to do it. If they already spent money on a forward, they might not have as much left to negotiate on your specific deal.
Builder Margin and What You Should Actually Negotiate
Builder margin is getting compressed. Transactions are down and profit per transaction is down. Builders are in this to make money, and at some point they will sit on a lot rather than take a deal that does not work for them. Some builders build on unit count and just want to move homes. Others build on margin and care about how much they make on every deal. Some flip between the two depending on the week.
You want builders to make money. If a builder is not profitable, they will not be around for warranty issues. They will not keep building in the community, which means your home values do not go up. If a builder reduces their costs year over year, they are bringing down the comps for everyone in the neighborhood. A buyer who pushes for more than the builder is willing to give might get the deal, but they create an adverse effect for every other homeowner in that community.
If you are the comp that tanks the neighborhood, you will not be able to sell your home in 5 years for what you paid. Builders recognize that they are not just protecting the margin on one deal. They are protecting the investment of the first 20 buyers who already closed and the next 30 buyers they are still trying to sell to. They will go as far as it makes sense, but not past the point where it hurts everyone else.
Where to Spend Builder Money
Every dollar the builder lowers your purchase price reduces the percentage they can contribute toward closing costs. If you drop the price by $10,000, you lose $300 to $600 in interested party contribution depending on your loan type. You have to find the value somewhere else.
The three places to spend builder money are purchase price, upgrades, and closing costs or rate buydown. Not everyone has 20% down. Not everyone has 5% in closing costs. If you need help getting into the home, closing cost credits and rate buydowns make more sense than a lower purchase price. If you have cash and you want the lowest monthly payment, a permanent rate buydown is better than upgrades. If you want to live in the home for 20 years and you care about finishes, upgrades might be worth more than a lower rate.
Upgrades have gotten more expensive. Part of that is labor and materials. Part of that is cost centers. Builders are trying to recoup margin somewhere, and the design center is one place they can do it. I have had clients blink and spend $10,000 on cabinets without realizing it. You have to decide where the value is for the long term of living in the house.
Which Mortgage Structure Makes Sense for You
You should compare how the builder dollars make the most sense for your situation. Some buyers need the lowest sales price possible. Some need the lowest monthly payment. Some need the lowest out-of-pocket to close. Those are not always the same deal.
If you have money to put down and you plan to stay in the home for 10 or 15 years, a fixed rate with a permanent buydown might make more sense. If you are relocating in 5 years or you think rates will drop and you will refinance, an ARM saves you money now and you can refinance later. If you need help with closing costs and you do not have a lot of cash, a closing cost credit is more valuable than a rate buydown.
This is where it matters to work with a lender who understands builder math. Not every deal gets structured the same way, and it should not. The right structure depends on how much you are putting down, how long you plan to stay, and what you need help with upfront. A lender who works with builders regularly knows how to compare the options and show you the trade-offs.
ARMs are not bad. They are a tool. If you understand how they work and you know your plan for the home, they can save you thousands of dollars. If you do not understand them or you are scared of the adjustment, a fixed rate is safer even if it costs more. The worst thing you can do is take an ARM because the payment is lower without understanding what happens in year 8.
Conclusion
Adjustable rate mortgages are not the same product that caused problems in 2008. The caps are tighter, the underwriting is stricter, and the math works if you know your timeline. Builders are offering them because they can get deeper into the rate with the same amount of money, and buyers are taking them because the savings are real.
If you are looking at new construction in DFW and a builder is offering a 3.99% ARM versus a 6.5% fixed rate, run the numbers. Look at how much you save in the first 5 or 7 years. Look at what happens if you refinance or sell before the adjustment. Look at what happens if you do not. Then decide which structure fits your plan.
I work with buyers on new construction deals across DFW every week, and I can walk you through how the builder money works and which levers to pull to get the deal that makes sense for you. If you want to talk through your options, call or text me at 469-707-9077 or book a FREE consultation here. I am happy to help.
Frequently Asked Questions About ARMs in New Construction
Can I refinance out of an ARM before it adjusts?
Yes. There is no prepayment penalty on an ARM. You can refinance anytime just like you would with a fixed-rate loan. If rates drop in year 4 or you want to lock in a fixed rate before the adjustment, you refinance and the ARM goes away. The refinance is a new loan based on your income, credit, and the home value at that time.
What happens if I sell the home before the ARM adjusts?
Nothing. If you sell in year 6 of a 7-year ARM, the rate never adjusts and you saved money the entire time you owned the home. The buyer who purchases your home gets their own mortgage. Your ARM does not transfer.
Do ARMs work with FHA and VA loans?
Yes. FHA and VA both offer ARMs with the same structure as conventional loans. The rate is fixed for 5 or 7 years, then it adjusts annually with a 1% cap per year and a 5% lifetime cap. The qualification rules are the same as the loan type. VA buyers qualify on the note rate for a 7-year ARM and on a calculated rate for a 5-year ARM.
How much can a builder contribute toward closing costs if they are also offering an ARM?
The ARM rate comes from a forward commitment, which does not count against interested party contribution limits. The builder can still contribute up to the federal limit based on your loan type and down payment. On a conventional loan with less than 10% down, that is 3% of the purchase price. With 10% or more down, it is 6%. FHA allows 6% regardless of down payment. VA allows 4%. The builder can give you the ARM rate and the full interested party contribution, but they are pulling from their margin to do it.
Should I take an ARM if I plan to stay in the home for 10 years?
It depends on whether you are willing to refinance. If you take a 7-year ARM and you plan to stay for 10 years, you will hit the adjustment in year 8. If rates are higher, your payment goes up. If you refinance in year 7 before the adjustment, you lock in a new fixed rate and you saved money for 7 years. If you do not want to deal with a refinance and you want payment certainty, a fixed rate is safer even if it costs more upfront.
Are ARMs only available on specific homes or can I use them on any lot?
It depends on how the builder structured the forward commitment. Some builders buy forwards and tie them to specific inventory they need to move. If you want a different lot, the ARM might not be available. Other builders buy forwards and make them available across their entire portfolio until the money runs out. Ask the builder whether the ARM is tied to specific homes or available on any lot in the community you are looking at.
Zak Schmidt
From in-depth property tours and builder reviews to practical how-to guides and community insights, I make navigating the real estate process easy and enjoyable.
