Building a new house while your current one is still on the market means running two transactions on parallel tracks: a construction project you don’t fully control and a sale that depends on a buyer you haven’t met yet. To build a house while selling yours without a cash crunch or a broken contract, you need financing that matches your equity and timeline, contract language that lets one deal survive if the other stumbles, and a closing sequence where the sale proceeds arrive in time to pay the builder. The sections below work through those decisions in the order you’ll face them.
Financing the Gap Between Build and Sale
Three products cover most situations. The right one depends on how much equity you have in your current home, how long construction will take, and how much interest-rate risk you’re willing to carry.
Bridge Loans
A bridge loan is short-term financing that covers the gap between buying or breaking ground on the new property and selling the old one. Terms usually run six to twelve months with interest-only payments and a balloon at the end. Rates run noticeably higher than conventional mortgages, generally 8.5% to 11%, and most lenders require at least 15% to 20% equity in your current home, letting you borrow up to 80% or 85% of it.
Bridge loans fund quickly and let you make a non-contingent offer. The risk is that if your home doesn’t sell on schedule, you keep making high-interest payments with no clear exit. Use one when the current home is likely to move fast, not as a default.
Home Equity Line of Credit or Home Equity Loan
If you have substantial equity, a home equity line of credit lets you draw funds as the builder hits milestones. A HELOC is revolving credit secured by your home, with a variable rate tied to an outside index, so payments can shift during the build. A home equity loan is different: a lump sum at a fixed rate with predictable monthly payments, which is useful if you want to know your exact cost, but you lose the draw-only-what-you-need flexibility.
Either product disappears the moment you sell the home securing it, so plan how the balance will be paid off at your sale closing.
Construction-to-Permanent Loans
A construction-to-permanent loan, sometimes called a single-close loan, combines construction financing and the permanent mortgage into one transaction. You close once, the lender funds draws to the builder during construction, and when the house is finished the loan converts to a standard mortgage without a second closing. The advantage is avoiding a second set of closing costs and locking your permanent rate before construction begins. The two-close alternative means paying closing costs twice and exposing yourself to whatever rates look like months later.
Down payment requirements vary. FHA-backed construction loans can go as low as 3.5% down with a credit score of 580 or higher. Conventional construction-to-permanent loans typically require 10% to 20% down. In exchange for the single-close convenience, lenders will scrutinize the builder’s credentials, project timeline, and draw schedule more heavily than they would on a straight purchase.
Whatever product you choose, federal law requires your lender to send a Loan Estimate no later than three business days after receiving your application, spelling out the interest rate, monthly payments, and total closing costs.1Consumer Financial Protection Bureau. TILA-RESPA Integrated Disclosure FAQs Origination fees typically run 1% to 3% of the loan amount. Compare the Loan Estimate against any builder-recommended lender’s offer, because that’s where you have real negotiating leverage.
Contract Clauses That Keep One Deal From Sinking the Other
Your construction contract and your home sale agreement need to work together. If one falls through, the language in both determines whether you lose a deposit, get stuck with two properties, or walk away intact.
Sale-of-Home and Settlement Contingencies
A sale-of-home contingency makes the construction contract binding only if you sell your current home by a stated date. The clause should name the exact property and the minimum sale price you need to fund the build. A settlement contingency is narrower: it applies when you already have a buyer under contract and only need their closing to go through. The deadline is usually tied to the builder’s projected completion date, and if the buyer’s financing collapses before then, you can typically terminate the construction contract and keep your earnest money.
Kick-Out Clauses
Builders often insist on a kick-out clause in exchange for accepting a contingency. The clause lets the builder keep marketing the project and take backup offers. If a better buyer appears, you get a short window, usually 48 to 72 hours, to either drop your contingency and commit unconditionally or step aside. Make sure the contract specifies when you must list your home for sale to show good-faith effort; most builders require the listing to be active within five to ten business days of signing.
Material Price Escalation Clauses
Lumber, steel, and concrete prices can swing significantly during a six-to-twelve-month build. An escalation clause lets the builder pass through cost increases on specified materials that occur after the contract is signed. Require written notice with invoices before any purchase at a higher price, and negotiate a percentage cap on total contract increases with a right to terminate if costs breach the cap. A clause with no ceiling is a blank check.
A liquidated damages provision runs the other direction: it charges the builder a set dollar amount per day of delay beyond the agreed completion date. That’s not a penalty, it’s a pre-agreed estimate of your real costs from a late finish, including extended temporary housing, additional loan interest, and storage. A builder who resists any delay accountability is telling you something about how they manage timelines.
When to List Your Current Home
List too early and you’ll feel pressure to accept a low offer or scramble for temporary housing. List too late and construction can finish with no buyer in sight, leaving you carrying two payments. For most people the sweet spot is when construction reaches the “under roof” stage: the structure is enclosed and a completion date is reasonably predictable. That’s when you can offer buyers a realistic closing window.
Work with a real estate agent experienced in concurrent transactions. They can set the listing with a flexible closing date in the MLS notes, which attracts buyers who don’t need to move immediately. Stay in regular contact with your builder about milestones such as rough electrical, plumbing inspections, and drywall, so the listing agent can update the expected closing window as the timeline shifts. Buyers walk away from deals that feel uncertain.
Rent-Back Agreements When the Calendar Doesn’t Cooperate
If your current home sells before construction finishes, a rent-back agreement lets you stay in the sold home as a tenant for a short period after closing. Most rent-backs cap at 60 days, though this varies by state and by what the buyer will accept. Rent is typically based on fair market rental value for similar homes in the area, prorated daily. The buyer will usually require a security deposit.
A rent-back buys time, but it isn’t a full solution for a build months from completion. Beyond 60 days you’re looking at temporary housing, moving costs, and storage fees. Build that possibility into your budget from the start.
What Construction Delays Actually Cost
Delays are the norm in residential construction, not the exception. Weather, permit backlogs, material shortages, and subcontractor scheduling all contribute, and every week compounds the cost.
If you locked your mortgage rate early, an extension typically costs 0.125% to 0.375% of the loan amount per 15-day increment. On a $400,000 loan, that’s $500 to $1,500 per extension, and most lenders allow a maximum of three. If the lock expires without an extension, you get whatever rate the market offers on closing day. Request extensions before the current lock expires, not after.
Taxes on the Sale and the Build
Capital Gains Exclusion on the Home You Sell
If you’ve owned and lived in your current home for at least two of the last five years, you can exclude up to $250,000 of profit from the sale if filing individually, or $500,000 if married filing jointly.2Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain from Sale of Principal Residence For the joint exclusion, both spouses must meet the two-year use requirement and at least one must meet the ownership requirement. You can’t have claimed the exclusion on another sale in the prior two years.
The timing wrinkle in a build-and-sell scenario is that you may stop living in the current home before it sells. If you move into temporary housing while construction finishes, the two-year use clock keeps running. Selling more than three years after you last lived in the home could shrink or eliminate the exclusion, so factor that into your construction timeline.
Mortgage Interest During Construction
You can treat a home under construction as a qualified residence for the mortgage interest deduction for up to 24 months, but only if you actually move in when construction finishes.3Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction The 24-month window can start any time on or after the day construction begins. Interest paid beyond that window is not deductible as home mortgage interest.
Insurance During the Build
Standard homeowners insurance won’t cover a house that doesn’t exist yet. A builder’s risk policy fills that gap, covering the construction project against fire, theft, vandalism, storm damage, and damage to materials in transit. Coverage extends to equipment and supplies on-site and blueprints, and can sometimes include financial losses like additional loan interest triggered by a covered event.
Builder’s risk policies come in three-, six-, or twelve-month terms. Some municipal authorities require them, and most construction lenders do too. Your builder may carry their own policy; verify exactly what it covers before assuming you’re protected. If coverage excludes certain hazards or has low limits, you may need a separate owner’s policy.
Keep your existing homeowners policy active on the current home until it closes. If you move out before selling and the home sits empty, notify your insurer. Some policies limit coverage for homes unoccupied beyond 30 to 60 days.
Coordinating the Two Closings
Back-to-Back Closings
The ideal is a back-to-back closing where proceeds from the sale fund the purchase of the new home on the same day or within a few days. The title company or escrow officer handling both transactions has to sequence disbursements precisely: the payoff from your sale must clear before the final payment to the builder wires out.
You’ll receive a Closing Disclosure at least three business days before each closing, detailing every fee, credit, and disbursement amount.4Consumer Financial Protection Bureau. Know Before You Owe: You’ll Get 3 Days to Review Your Mortgage Closing Documents If the disclosed APR changes, the loan product changes, or a prepayment penalty is added after the initial Closing Disclosure, a new three-business-day waiting period starts.1Consumer Financial Protection Bureau. TILA-RESPA Integrated Disclosure FAQs That reset can blow up a carefully timed back-to-back closing. Review every line the moment the disclosure arrives and flag discrepancies immediately.
Wire Fraud at Closing
Back-to-back closings involve large wire transfers, and real estate wire fraud is one of the fastest-growing financial crimes in the country. The pattern is consistent: a fraudster monitors email traffic between you, your agent, and the title company, then sends a convincing last-minute email with different wiring instructions. Funds sent to the fraudulent account are extremely difficult to recover.
Always verify wiring instructions by calling the title company at a phone number you obtained independently, never a number pulled from the email containing the instructions. Never wire money based on emailed instructions alone, even from someone you trust.
Mechanics Liens and Title Insurance
Buying newly built property creates a title issue that doesn’t exist with resale homes: mechanics liens. If your builder doesn’t pay a subcontractor or material supplier, that party can file a lien against your property, sometimes months after closing. A standard owner’s title policy may include an exception that specifically removes coverage for these construction-related liens.
Ask the title company to delete the standard mechanics lien exception or add an endorsement covering liens from pre-closing construction work. This usually requires the title company to collect lien waivers from subcontractors before issuing the policy. It adds a step to closing, but it’s the difference between a clean title and a six-figure legal fight later.
Final Walkthrough and Possession
Before funds are released, walk through the new construction and confirm that every specification from the original contract and any change orders has been completed. Check fixtures, finishes, and systems against what you agreed to. This is your last real point of leverage. Once the wire clears, getting the builder back to fix deficiencies becomes much harder.
After funds transfer and both deeds are recorded at the local land records office, you take possession of the new home and legal ownership of both properties has officially changed hands. Keep copies of the recorded deeds, the final Closing Disclosures for both transactions, your builder’s warranty documentation, and all lien waivers from subcontractors in a permanent file. You’ll need them for taxes, insurance claims, and any warranty dispute that surfaces later.