The 45L Credit: The New-Construction Credit Almost Nobody Asks About

Most of the energy credits we cover point at existing homes. Section 45L points the other way, at homes that don’t exist yet, and it pays the builder rather than the buyer. $2,500 for a new home certified to Energy Star standards. $5,000 for one certified Zero Energy Ready. Per home, with no annual limit, which is why a production builder closing 200 qualifying houses a year is looking at a seven-figure credit while most of their buyers have never heard the section number.

If you build homes, this is money on the table. If you’re buying new construction, it’s negotiating information. Both angles below.

45L credit amounts: $2,500 Energy Star, $5,000 ZERH

Certification is the whole game. There’s no self-assessment path, no “built to equivalent standards” argument. A third-party rater verifies the home, the certification issues, and the credit follows the paperwork. Builders who already construct to code-plus standards often sit a rater’s visit away from $2,500 a house and don’t collect it.

Multifamily runs on the same structure at $500 and $1,000 per unit, rising to $2,500 and $5,000 when prevailing-wage requirements are met during construction. A 60-unit project built with prevailing-wage labor and ZERH certification is $300,000 in credit, the kind of number that changes a pro forma.

Who claims the 45L tax credit: builders, not buyers

The eligible contractor, meaning the builder who owned the home during construction and sold or leased it. Not the buyer. The homeowner’s tax return never sees 45L, and the credit is claimed on Form 8908 with the builder’s business return.

Two consequences fall out of that.

Rentals qualify. A build-to-rent operator or a landlord constructing a duplex claims 45L on units they’ll lease out. After a whole article on how rental property kills the residential credits, here is the exception that runs the other way: 45L has no residence test at all.

Spec builders and custom builders both qualify, but a homeowner acting as their own general contractor on their own future residence generally does not. The credit wants a builder-to-customer transaction.

What the credit means for homebuyers

You can’t claim the credit, but you can know about it, and knowing changes two conversations.

The certification conversation. Ask whether the home will be Energy Star or ZERH certified. A builder pursuing 45L has already paid for the rater and the performance testing, which means the certificate documents real blower-door and duct-leakage numbers. You inherit a measurably tighter house, and you have third-party paper saying so.

The price conversation. On a certified home, the builder is collecting $2,500 to $5,000 you’ll never see. That’s leverage during upgrade negotiations. It sometimes shakes loose a free appliance package, and even when it doesn’t, asking signals you know how the home is being financed better than the next buyer in the model home.

And the credits you do claim still apply. New construction is excluded from the 25C home improvement credit, but the 25D clean energy credit works fine on a new build. Solar or a battery added to your new home earns you 30% directly, on top of whatever 45L paid the builder.

Frequently asked questions

Can I claim 45L if I built my own house?

Owner-builders generally can’t. The statute wants an eligible contractor selling or leasing to another person. If an entity you own built the home and sold it to you personally, you’re in get-a-professional territory.

Does 45L reduce the buyer’s basis in the home?

No. The builder’s credit is the builder’s tax matter. Your purchase price is your basis, unaffected.

How long has this been around, and is it expiring?

45L dates to 2006 and was extended and restructured through 2032. Deadlines for the whole credit family are tracked in our expiration guide.

We’re a small builder doing 8 homes a year. Is certification worth the cost?

Rater fees typically run $500 to $1,500 per home depending on market and program. Against $2,500 per certified home, the math clears easily at 8 homes, and the certification doubles as a marketing asset in listings. The ZERH tier is a bigger construction-practice jump. Price that one against your actual envelope upgrade costs.

Manufactured homes?

Yes, at their own tier levels under the Energy Star Manufactured Home requirements. Same structure, builder claims.

If you’re on either side of a new build

Builders: talk to a HERS rater before the next slab pours, since certification is far cheaper designed-in than retrofitted. Buyers: ask for the certificate, then plan your own 25D solar credit on top and run the numbers in the OBBB calculator.