SeaTac Down Payment Assistance Guide 2026: ONE+, WSHFC & Every Program Worth Knowing

Saving for a down payment in 2026 feels like trying to fill a bathtub with the drain open. The grocery bill is noticeably higher than it was two years ago — the kind of higher that shows up every single week. Rent crept up again. Gas never really settled back to where it was. A raise came through at work, maybe even a good one, but the savings account balance looks almost identical to what it did eighteen months ago. That's not a personal failure. That's the math of living in a market where the cost of everything outpaces the ability to set money aside. For anyone trying to build toward homeownership in SeaTac while also paying rent, managing a car payment, and keeping the lights on, the gap between "almost there" and "at the closing table" can feel permanent.

It doesn't have to be. There's a program called ONE+ by Rocket Mortgage that changes the math in a specific and meaningful way. The buyer puts down 1% of the purchase price. Rocket Mortgage contributes 2% — up to $7,000 — as a grant. Not a deferred loan. Not a second lien that waits at the back of the closing disclosure to follow you when you sell. A grant that never gets repaid, ever. The buyer who was $10,000 short suddenly needs a fraction of what they assumed. ONE+ is also not restricted to first-time buyers — repeat buyers qualify too, as long as household income falls at or below the King County limit of $114,800. For buyers whose income exceeds that ceiling or whose purchase price runs above the program's loan limit, Washington's WSHFC Home Advantage program offers a different path with a striking $147,400 income cap for King County buyers.

Both programs are real, both are active in SeaTac in 2026, and they serve different buyers at different price points. ONE+ has a $350,000 loan ceiling — and in a market where the median sold price for single-family homes sits around $600,000, that ceiling matters. This guide explains exactly what ONE+ covers, where it falls short, how WSHFC programs fill the gap, and how to figure out which program fits your situation before you make an offer.

ONE+ by Rocket Mortgage: Washington's Only True Grant

Every other down payment assistance program available to SeaTac buyers works as a loan. The structure varies — some charge zero interest, some defer payments for thirty years, some forgive over time — but the common thread is that the money eventually comes back out of the transaction. When you sell or refinance, that second mortgage gets settled. ONE+ is structurally different in a way that matters: Rocket Mortgage contributes 2% of the purchase price as a grant, with no repayment obligation, no interest, no second lien, and no recapture. The buyer brings 1% to closing. The grant covers the other 2%. Together they hit the 3% threshold required for a conventional loan, and the $7,000 stays in the buyer's pocket permanently.

The ONE+ Ceiling: What It Means for SeaTac Buyers

ONE+'s $350,000 loan ceiling is the single most important number for SeaTac buyers to understand before getting attached to any particular program. The median sold price for single-family homes in SeaTac has tracked between $540,000 and $626,250 over the last six months of closed transactions. The median asking price for detached homes sits closer to $670,000. A $350,000 loan limit — assuming 3% down — corresponds to a purchase price of roughly $360,000, and single-family homes at that price point do not currently exist in SeaTac's active market.

What does exist under that ceiling? Condos, primarily. There are active listings in the low-to-mid $200,000s for 1-bedroom units — Watermark Cove Condominiums has had inventory in the $235,000 range — and some 2-bedroom condo options appear in the upper $200,000s. Manufactured homes in 55+ communities like Bow Lake also appear in this range. For a buyer who is open to a condo as a first purchase, ONE+ is fully available and genuinely powerful.

Price Range	What's Typically Available in SeaTac	ONE+ Eligible?
Under $320K	1-bed condos; 55+ manufactured homes	✅ Yes
$320K–$350K	Some 2-bed condos; limited inventory	✅ Yes
$350K–$500K	Very limited; occasional townhome	❌ Exceeds ceiling
$500K+	Majority of detached SFR inventory	❌ Exceeds ceiling

For buyers who want a detached home in SeaTac's established neighborhoods — Riverton Heights, Bow Lake, North Hill — the realistic entry point starts well above $400,000, and most move well past $500,000. That doesn't make ONE+ irrelevant. It means the right conversation is about whether a condo entry makes sense as a stepping stone, or whether WSHFC's programs are the better starting point for a buyer targeting the broader market.

Two honest paragraphs here matter. If you're a buyer with a $350,000 budget in SeaTac, the condo inventory is real and some of it has been meaningfully updated. These aren't compromise properties — they're an actual path into homeownership in a city that sits 20 minutes from downtown Seattle. But if your plan requires a detached home with a yard, ONE+ won't get you there in SeaTac's current market, and pretending otherwise wastes time.

When You Need More: Washington's State DPA Programs

For buyers shopping above ONE+'s ceiling — which describes the majority of SeaTac's detached home market — Washington's state programs run through the WSHFC and represent some of the most accessible assistance available anywhere in the Pacific Northwest.

Home Advantage — The King County $147,400 Income Ceiling

The Home Advantage program's most misunderstood feature is its income limit. In King County, that ceiling sits at $147,400 — not the statewide baseline, but a county-specific figure that reflects local costs. A dual-income household in SeaTac earning $130,000 qualifies. This is not a low-income program; it's a market-rate program designed for the exact income band where buyers earn too much for deep-subsidy assistance but still can't accumulate a down payment fast enough to keep pace with appreciation. The DPA comes as 4–5% of the first mortgage, structured as a second mortgage at 0% interest with payments deferred for 30 years and $0 in monthly payments on the DPA portion. No first-time buyer requirement. Compatible with conventional, FHA, VA, and USDA loans. The critical structural difference from ONE+ is that this money does come back at sale or refinance — it's not a grant, it's a deferred obligation. The 30-year deferral means most buyers will repay it when they sell, not before. A 5-hour WSHFC-approved homebuyer education seminar is required before closing, with online options available.

House Key Opportunity — For Lower-Income First-Time Buyers

House Key Opportunity is designed for first-time buyers — defined as no homeownership in the past three years — whose income falls below the program's more restrictive King County limits. The DPA can reach up to $15,000, structured as a second mortgage at 1% interest with 30-year deferred payments. Because this program is bond-funded, it carries IRS recapture potential: if you sell within nine years, experience income growth, and realize a capital gain, a portion of the federal subsidy may be recaptured. The three conditions must all be met simultaneously for recapture to trigger, but buyers should understand the exposure before committing. The same 5-hour seminar applies.

HomeChoice — Disability Households

HomeChoice offers up to $15,000 in DPA for borrowers or household members living with a disability. It's available statewide, pairs with both Home Advantage and House Key first mortgages, and follows the same deferred-second-mortgage structure. For households that qualify, it stacks with other assistance.

The structural gap between ONE+ and every WSHFC program is worth stating plainly: WSHFC programs defer the cost of assistance until exit. ONE+ eliminates it entirely. Both solve the cash-to-close problem that stops buyers from making offers. What they don't share is the back-end experience — ONE+'s grant is genuinely gone, while a Home Advantage second mortgage is a real obligation that will surface at your future closing table.

ONE+ vs Washington Bond Programs: The Direct Comparison

	ONE+ by Rocket	WSHFC Home Advantage	WSHFC House Key
Assistance type	True grant — no repayment	Deferred second loan	Deferred second loan
Max loan	$350,000	No ceiling	No ceiling
Income limit (King Co.)	≤$114,800	$147,400	Varies by household size
Cash at closing	✅ $7,000 grant	✅ 4–5% of loan	✅ Up to $15,000
Repayment required	Never	Yes — at sale/refi	Yes — at sale/refi
Recapture tax risk	None	None	Yes (if 3 conditions met)
First-time required	No	No	Yes
Loan types	Conventional only	Conv, FHA, VA, USDA	Conv, FHA, VA, USDA
Who processes	Rocket Mortgage	WSHFC-approved lender	WSHFC-approved lender
Education required	No	Yes — 5-hour seminar	Yes — 5-hour seminar

For the buyer ONE+ fits — income under $114,800, comfortable with a condo or a home priced at or below $360,000, wants a clean grant with no future repayment obligation — it is the stronger deal. No seminar requirement. No second lien at your next closing. Just $7,000 that's yours.

For buyers targeting SeaTac's detached single-family market above $400,000, Home Advantage is the functional path. The income ceiling of $147,400 captures a meaningful portion of dual-income households in SeaTac, and the 4–5% DPA on a $550,000 home can represent $22,000–$27,500 in assistance — far beyond what ONE+'s maximum grant covers. The loan-type flexibility also matters for buyers using FHA or VA financing, which ONE+ doesn't support.

What ONE+ Looks Like at the Closing Table

Item	Amount
Purchase price	$340,000 (example)
Buyer's 1% down	$3,400
Rocket's 2% grant	$6,800 — never repaid
Total down payment	$10,200 (3%)
Estimated closing costs	$6,500–$8,500 (varies by lender credits, title, county)
Buyer's estimated total cash to close	~$9,900–$11,900

The buyer came up with $3,400 toward a down payment instead of $10,200. The $6,800 grant accounts for the difference. Closing costs exist regardless of which program you use — they're a function of the transaction, not the DPA choice — and they're best discussed during a pre-approval conversation where lender credit options can be factored in.

Does DPA Actually Work in SeaTac's Competitive Market?

SeaTac's market carries a Redfin Compete Score of 85 out of 100, which puts it in "very competitive" territory. Homes have been going pending in roughly 14–16 days, and while the average home sells slightly below list price, multiple-offer situations are common enough that buyers using financing contingencies — including DPA-assisted offers — should be prepared to write clean offers wherever possible. Sellers in SeaTac's market are familiar with government-backed loans and assistance programs; this isn't a market where DPA offers face automatic skepticism. What they do face is competition from buyers who can waive contingencies or close quickly.

For ONE+ specifically: the program's practical reach in SeaTac's detached home market is limited by the $350,000 loan ceiling, but condo buyers have real inventory to work with. The sub-$350,000 condo segment — primarily 1- and 2-bedroom units in communities like Watermark Cove and South Ridge — is where ONE+ has direct application today. For buyers targeting those properties, a pre-approval through Rocket Mortgage can be completed the same day, which matters in a market where sellers care about offer readiness.

For Home Advantage buyers shopping SeaTac's single-family neighborhoods, the program is fully compatible with competitive offers. The key is working with a WSHFC-approved lender, completing the homebuyer seminar before going under contract, and having the pre-approval letter in hand before writing an offer. Sellers in the $540,000–$650,000 range in SeaTac are not unfamiliar with second-mortgage DPA structures — the program is active across King County, and experienced listing agents understand how closings work.

King County Housing Authority also offers up to $15,000 in DPA structured as a second mortgage forgiven over ten years for buyers who remain in the home. HomeSight's layered assistance program serves King County buyers with a shared-appreciation model that can reach significantly higher assistance levels for buyers who qualify. These programs are worth exploring in parallel, particularly for buyers who need to cover both the down payment and closing costs and whose purchase price stretches toward the higher end of SeaTac's current market.

Local Expert Takeaway: For SeaTac buyers with household income under $114,800 who are open to a condo purchase in the $235,000–$350,000 range, ONE+ is the clear first call — a $7,000 grant with no repayment obligation and same-day pre-approval is a meaningful advantage in a fast market. For buyers targeting SeaTac's detached single-family inventory in the $540,000–$650,000 range, Home Advantage is the realistic DPA path — the $147,400 King County income ceiling is generous, and 4–5% DPA on a $600,000 purchase can represent over $25,000 in assistance. Don't skip the KCHA $15,000 forgiven second mortgage as a stacking option — King County buyers can often layer programs to cover both the down payment and closing costs, which is where deals actually come together.

Quick Takeaways & FAQs

✅ ONE+ by Rocket Mortgage is a true grant — $7,000 that never gets repaid, available to first-time and repeat buyers alike, with same-day pre-approval available through Todd.

⚠️ ONE+'s $350,000 loan ceiling means most SeaTac detached homes fall outside its reach — condos are the primary ONE+ opportunity here, while Home Advantage covers the full single-family market.

📍 Washington Home Advantage carries a $147,400 King County income ceiling — well above what most buyers expect from a "down payment assistance" program, and available with no first-time buyer requirement.

Is there down payment assistance in SeaTac, Washington?

Yes, SeaTac buyers have access to multiple active programs in 2026. ONE+ by Rocket Mortgage provides up to $7,000 as a true grant for buyers with income at or below $114,800 and a purchase price within the $350,000 loan ceiling. Washington's WSHFC Home Advantage program covers buyers up to $147,400 in income with no purchase price ceiling, and King County Housing Authority offers an additional $15,000 in forgiven DPA for qualifying buyers who remain in the home.

What is the income limit for Washington Home Advantage in King County?

The King County-specific income limit for WSHFC Home Advantage is $147,400 — higher than the statewide baseline due to King County's designation as a high-cost market. This means a dual-income household earning $130,000–$145,000 may still qualify. Home Advantage carries no first-time buyer requirement and is compatible with conventional, FHA, VA, and USDA loans.

What is the difference between ONE+ and WSHFC DPA?

The core difference is structural: ONE+ by Rocket Mortgage provides a 2% grant that is never repaid. WSHFC programs — Home Advantage, House Key, HomeChoice — provide deferred second mortgages that are repaid when the home is sold or refinanced. Both solve the cash-to-close problem. ONE+ eliminates the back-end obligation entirely; WSHFC programs defer it. For buyers ONE+ qualifies, it's the cleaner deal. For buyers shopping above the $350,000 loan ceiling or using FHA/VA financing, WSHFC programs are the functional path forward.