Buying before selling: contingent offers and bridge loans

The hardest transaction in residential real estate isn't buying your first home — it's buying your second while you still own the first. Your down payment is locked in your current house, your income can't qualify for two mortgages comfortably, and sellers don't love waiting on your sale. Every solution to this puzzle costs money; the job is picking the cheapest one for your situation.

Option 1: the home sale contingency

You offer on the new house contingent on selling your current one — if yours doesn't sell by a deadline, you exit with your earnest money. It's the cheapest option on paper and the weakest offer in practice. In competitive markets, sellers routinely pass over contingent offers or demand a price premium to accept the risk. Many contracts also include a kick-out clause: the seller keeps marketing, and if another buyer appears, you typically get 24–72 hours to drop your contingency or walk.

Option 2: sell first, then buy

Selling first makes you a clean, non-contingent buyer with cash in hand — the strongest position possible. The cost is the gap: you may need temporary housing and two moves. Two workarounds shrink it. A rent-back agreement lets you stay in your sold house paying the buyer rent for 30–60 days while you shop (lenders usually cap rent-backs at 60 days for owner-occupied buyers). A long closing on your sale — 60–90 days — buys shopping time while your deal is locked.

Option 3: bridge loans and their cousins

• Bridge loan: a short-term loan against your current home's equity that funds the new down payment. Typically 6–12 month terms, rates roughly 2–3 points above mortgage rates, plus 1.5–3% in fees.
• HELOC on your current home: often the cheapest bridge if you open it before listing — lenders generally won't open one on a house already on the market. Interest-only draws, minimal closing costs.
• 401(k) loan: borrow up to $50,000 or half your vested balance; you repay yourself with interest. Risk: job change can make it due quickly, with taxes and penalties if unpaid.
• Buy-before-you-sell programs (Knock, Orchard, lender 'trade-in' products): a company fronts the new purchase or guarantees your sale, for total costs commonly 2–6% of a transaction. Convenient, genuinely expensive.

Qualifying for two payments

Even with the down payment solved, your lender counts both mortgage payments (and the bridge payment) in your debt-to-income ratio unless your current home is under contract with financing contingencies cleared. Some lenders offset with a signed lease if you're converting the old house to a rental. Get pre-approved for the two-payment scenario before falling for a house — plenty of buy-before-sell plans die in underwriting, not at the offer table.

Choosing your route

1. Hot market for your current home, competitive market for the new one: open a HELOC now, buy non-contingent, sell fast. Cheapest strong-offer play.
2. Balanced or slow market: sell first and negotiate a rent-back or long close. Certainty beats elegance when buyers are scarce.
3. Buyer's market for the new home: try the contingency — sellers with few offers accept them, and it's free.
4. Lots of equity, low risk tolerance for timing: price a bridge loan and a trade-in program side by side, in writing, including every fee.

The four routes, compressed

Here's the decision compressed into one table, using the $550,000-purchase example above. Costs are typical estimates and assume your current home sells within about four months; the last column is the honest one — what happens when it doesn't.

The table explains why experienced agents push 'sell first' harder than any financing product: it's the only row where a slow market costs you nothing. The bridge row is the value play for well-priced homes in normal markets, and the trade-in row is convenience priced like convenience. Whatever you pick, set a tripwire in advance — if the old house hasn't attracted an acceptable offer within thirty days, cut the price by a pre-agreed amount rather than renegotiating with your own optimism every week.

And whatever route you take, keep both insurance policies and both sets of utilities running until the old house actually closes — vacant-home claims and burst pipes have ruined more buy-before-sell timelines than any appraisal ever has.

The bottom line

Buying before selling is a financing puzzle with four standard answers: a contingency (cheap, weak), selling first (strong, inconvenient), a bridge or HELOC (strong, interest-metered), and trade-in programs (effortless, expensive). Match the tool to your local market speed, stress-test the slow-sale scenario, and remember that the strongest negotiating position in real estate is being able to buy without asking anyone to wait.