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Selling to Buy a New Build: Timing Planner

Buying a new build while you still own your home? Compare listing now, timing your sale to the builder’s date and closing on the build first, with your numbers.

Updated October 2026 · Rudy Flores

A new build adds a third calendar to the usual two: the builder’s. Your purchase closes when the home is finished, and that date is an estimate that can move. This planner lines up three ways to time your sale around it, using the builder’s estimated completion and your own figures.

Enter the builder’s estimate, how late it might run and what your current home could sell for. The chart shows when each path lists and closes, whether you’d rent or own both for a while, and what a late finish would add. Buying a resale instead? Switch the first question under The next home and the four resale paths appear.

For ZIP 91913 (Chula Vista, including parts of EastLake and Otay Ranch), the average stretch from listing to contract was 39 days in Zillow’s Sep 2026 numbers, and Freddie Mac put the average 30-year rate at 7.24% for the week of Oct 29, 2026.

Your home now

What your home could sell for

Starts at Zillow’s typical 3-bedroom value for ZIP 91913 (Sep 2026). Not sure? Ask Rudy for a home value from recent sales nearby.

What you owe on it

What you still owe on every loan on the home; your payoff statement has the exact figure. The starting figure, 40% of the value, is a placeholder.

Its monthly payment, all in

Your loan payment plus property tax, insurance and HOA dues. It is counted for each day you own both homes. The starting figure is a placeholder.

Total agent commission

Commission is negotiable and set in your listing agreement. Enter the total rate you expect to agree on.

Escrow, title and transfer tax

Escrow, title, county transfer tax and other seller costs, as a share of the price. California’s county transfer tax is $1.10 per $1,000, and some cities add their own.

Repairs and preparation

Repairs, paint, cleaning or staging before you list. Enter 0 to sell it as it is.

The next home

The next home is

A new build closes on the builder’s schedule, so the paths change to fit it.

Price of the next home (or the build)

Starts at Zillow’s typical 4-bedroom value for ZIP 91913 (Sep 2026). Use the builder’s price with the options you want.

Down payment

Conventional lenders may require mortgage insurance with less than 20% down (CFPB).

Interest rate on the new loan

Starts at the Freddie Mac average for the week of Oct 29, 2026. Use your lender’s quote when you have one.

Buyer closing costs

Buyer closing costs are commonly about 2% to 5% of the price (Freddie Mac).

Good-faith deposit

Use the deposits in the builder’s purchase agreement. Counted from savings when you sign before your sale closes.

HOA dues and special taxes

HOA dues and any special tax (Mello-Roos) on the next home, per month.

Timing

When you could list or start shopping

The day you could list your home or start shopping. It starts at today.

When you would like to be in the next home

The date you would like to be in the next home. The starting date is a placeholder; use your own.

Builder’s estimated completion date

Use the date in your builder agreement or from the sales office. Builder dates are estimates, so try a later one too. The starting date is a placeholder.

What if the build finishes late? (days)

A what-if, not a forecast: how many days late the build might finish.

Days to an accepted offer on your home

Starts at Zillow’s average days to pending for ZIP 91913 (Sep 2026). Your price, the home and the season move it.

Days to find the next home

Starts at 70 days, about the 10-week median home search in NAR’s 2025 Profile of Home Buyers and Sellers.

Days in escrow

Days from an accepted offer to closing. Your contract sets it; 30 is a common starting figure.

Days until your buyer removes contingencies

Starts at 17 days as a planning figure; your purchase contract sets the real number, so confirm it with your agent.

Rent-back you would ask for (days)

How long you would stay after your sale closes. Up to 29 days is usually written on C.A.R.’s Seller in Possession addendum (SIP); 30 days or more uses a Residential Lease After Sale (RLAS) (San Diego Association of REALTORS®). Your buyer has to agree.

Between homes, or buying first

Rent while between homes

Starts at Zillow’s typical rent for ZIP 91913 (Sep 2026). The tool also uses it for rent-back days. Rent-backs are often priced at the buyer’s daily cost of owning, which can be higher, so enter that figure if you know it.

Cost of one move

A starting figure, not a quote: movers $2,800 plus packing $400, as in the moving cost planner. Replace it with real quotes.

Equity loan rate, HELOC or bridge

Starts at the bank prime rate (7.00%, Oct 27, 2026, FRED), a reference point only. HELOC rates usually change over time (CFPB), and bridge loans are priced lender by lender.

Equity loan fees

A starting figure; ask your lender for its fees.

Most you could borrow against your home, counting your current loan

A starting figure; lenders set the real limit.

If you close on the build first, list your home

An equity line usually has to be open before the home is listed; otherwise ask about a bridge loan.

Fine print: tax and insurance

Property tax rate

Property tax as a share of the price each year. The starting figure is a placeholder; the tax bill for the home shows its real rate.

Homeowners insurance

Homeowners insurance as a share of the price each year. The starting figure is a placeholder; use a quote when you have one.

Mortgage insurance (under 20% down)

Mortgage insurance with less than 20% down, as a share of the loan each year. The starting figure is a placeholder; your lender quotes the real cost.

Which path are you leaning toward? (optional)

Optional. It highlights that path and lets you add its dates to your calendar.

Lining up a new home and a sale at once? The four-question Home Strategy Quiz helps, and Rudy answers with a plan that fits your timing.

Take the Home Strategy Quiz

Talk to a lender. Rates, loan programs and approvals come from lenders, not from websites or real estate agents. Talk to your own mortgage broker, or use our preferred lender, Point Mortgage Corporation (NMLS #231073), at (619) 475-4095. You are always free to choose any lender you like, and you can verify any lender’s license at nmlsconsumeraccess.org.

This is an estimate for planning. It is not a quote, an appraisal, a loan offer, or tax or legal advice, and Rudy is a real estate agent, not a lender, attorney or tax professional.

The three paths in plain English

List now

You sell on the open market now, bank the proceeds and rent until the builder hands over the keys.

When owners often choose it: Owners who want their sale wrapped up early and the money set aside for the builder’s deposits and closing.

Tradeoffs: Months of rent if the build is far off, a second move, and more rent if the finish date slips.

Time the sale to the build

You list so that your sale is set to close near the builder’s estimated date, with a rent-back as a cushion in case the home isn’t ready.

When owners often choose it: Owners who want one move and are comfortable adjusting the listing date as the builder updates the schedule.

Tradeoffs: Builder dates move, so your buyer may need a longer rent-back, or you may rent for a short time.

Close on the build, then sell

You close on the new home with an equity loan covering the down payment, move once, then sell your current home and pay the loan off from the sale.

When owners often choose it: Owners with strong equity who’d rather move straight in and sell an empty, ready-to-show house.

Tradeoffs: You carry two payments until the sale closes, cover the equity loan’s interest and fees and must qualify with both homes.

Rent-backs: put it in writing

When your sale closes before the build is done, a rent-back can keep you in place. The San Diego Association of REALTORS® describes two forms: C.A.R.’s SIP addendum for up to 29 days, and for a month or more the RLAS lease, which applies California landlord-tenant rules. Agree on it with your buyer in the sale contract.

Questions to ask your lender

Will you qualify me with both my current payment and the new home’s? Fannie Mae’s guide counts both unless my old home is under contract with the buyer’s financing contingencies cleared.
Is it smart to arrange a credit line on my current home before listing, and how would its rate move over a long build?
Can my rate be locked until the builder finishes, and what would an extension cost if the date slips?
How do the builder’s preferred-lender incentives compare with your offer, and am I free to choose either?

Timing a sale around a new build

Builders write their own purchase agreements, so whether one will accept an offer that depends on your sale, and for how long, varies from builder to builder. Completion dates on builder pages and in sales offices are estimates, not promises, so put a cushion in your plan and ask how the builder shares schedule changes.

Communities on our new-construction map that were selling or building when last checked:

Côta Vera (Otay Ranch Village 8), Chula Vista: Under construction, phased build-out (status as of October 8, 2026)
Epoca, Otay Mesa, San Diego (ZIP 92154): Homes on sale now (status as of October 8, 2026)
Mesa Verde, Otay Mesa, San Diego (ZIP 92154): Homes on sale now (status as of October 30, 2026)
Civita, Mission Valley, San Diego: Under construction, phased build-out (status as of October 8, 2026)

Before you sign, read how to negotiate a new build.

About these numbers

Calendar days throughout; weekend dates are flagged only.
Whichever path you pick, you finish with the same equity once both homes close; what changes is the cash required before then and the extra costs.
Rent and both-home payments are prorated per day.
No income tax or capital gains here, so ask a CPA, and your lender sets the rate and approval.

Questions owners ask

Can I sign with a builder before my current home sells?

Often yes, but each builder sets its own terms for sale contingencies and deposits. Ask before you sign, and use the close-on-the-build path to see what buying first would take.

When should I list if my new home is months away?

The time-the-sale path counts back from the builder’s date by your days on the market and escrow. Check it again whenever the builder updates the schedule.

What if the builder finishes late?

Use the late-finish question in the form. The table shows what extra rent or a second move would cost on each path.

Can I stay in my home after it sells while I wait for the build?

If your buyer agrees, a rent-back can bridge a short gap. Longer waits usually mean a rental, which the list-now path counts.

Sources: Zillow Research home values, rents and days to pending (Sep 2026); Freddie Mac Primary Mortgage Market Survey (Oct 29, 2026); FRED bank prime loan rate (Oct 27, 2026); NAR 2025 Profile of Home Buyers and Sellers (summary) (Dec 8, 2025); Freddie Mac: budgeting for upfront homebuying costs (Jun 4, 2025); California Civil Code 1675; CFPB: private mortgage insurance (Aug 28, 2023); CFPB: home equity lines of credit (Aug 28, 2026); Fannie Mae Selling Guide B3-6-06 (Sep 2, 2026); C.A.R. list of standard forms (Oct 30, 2026); San Diego Association of REALTORS®: post-closing occupancy (Aug 27, 2025); New-construction community map (statuses as of October 8, 2026). Your contracts, your lender and the county assessor have the final word on your own dates, loan and taxes.