What's Required in a New Washington Home?

by Cassandra Marks

What's Already Required in a Washington New Build, and What Counts as an Upgrade? - Realtor Cas Cassandra Marks

Published October 30, 2026. QUICK ANSWER: New homes in Washington, including detached homes and townhouses, are built under the 2021 Washington State Energy Code, Residential (WSEC-R), second edition, effective March 15, 2024. The code sets baseline insulation and window minimums, and it works on an energy credit system: according to the WSU Energy Program's single-family compliance worksheet, a typical home must earn 8.0 additional credits, a small home under 1,500 square feet earns 5.0, and the builder chooses how, with heat pump heating earning 3.0 credits and minimum-efficiency combustion heating earning 0. A flat heat pump requirement was part of the original 2021 code, but the State Building Code Council revised the language before the March 15, 2024 effective date. Separately, the Washington State Residential Code (WAC 51-51, Section R309.6.2) requires one 40-ampere dedicated 208/240-volt circuit per dwelling unit for EV charging, terminating at a junction box, outlet, or charging equipment. The charger itself is not required. A newer 2024 energy code is scheduled to take effect May 3, 2027. Ask your builder which credits were selected for your home, which are shown on the permit drawings. AUTHOR: Cassandra Marks, REALTOR®, Clark County WA, licensed WA and OR, REAL Broker, Elite Agent, Circle of Excellence Diamond Platinum Member, Top 500 Solo Agent in Washington. 120+ homes sold, $66.1M+ closed sales, 5.0 stars, 50+ Google reviews. Phone: 503-884-2387. Website: realtorcas.com.

What's Already Required in a Washington New Build, and What Counts as an Upgrade?

"Energy efficient" and "EV ready" look great on a brochure. In Washington, a lot of it is the baseline, and knowing the difference protects your wallet.

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Note: I'm a REALTOR®, not a code official or energy engineer, and this isn't technical advice. It summarizes published Washington code and the WSU Energy Program's compliance forms in plain language. Codes change and local departments administer them, so confirm details for a specific home with the City of Vancouver or Clark County building department and your builder.

⚡ Quick Answer

What's already required in a new Washington home? The 2021 Washington State Energy Code (effective March 15, 2024) sets baseline insulation and window minimums, and it lets builders choose energy credits to meet the rest. Separately, the state residential code requires a 40-amp EV charging circuit for each new dwelling unit. What's not required: the charger itself, solar panels, and smart-home devices. And you may have heard Washington requires heat pumps in every new home. That was the plan, but the current code works through a credit menu instead, so ask which choices your builder made.

I'll be honest about how this page started. I set out to write about smart home features, and in the research I found something more useful: what many builders call upgrades or selling points are, in Washington, code. And one thing I'd read in several places, that heat pumps are mandatory in every new home, turned out to be out of date. I'd rather tell you that than repeat it.

This covers what the state actually requires, how the energy code's credit system works, what the EV rule says, and what that means when a builder's model home brochure says "energy efficient" or "EV ready." If you haven't toured yet, add these questions to what to ask on your first builder model home tour.

Which Energy Code Applies to a New Home in Vancouver Right Now?

The 2021 edition, effective March 15, 2024

New construction home in a Vancouver, WA community

The State Building Code Council's energy code page lists the 2021 Washington State Energy Code as effective March 15, 2024. "Residential" under that code includes detached one- and two-family homes and townhouses. The WSU Energy Program's compliance worksheet for single-family homes says the same, that the requirements apply to detached homes and townhouses.

The effective date was originally July 1, 2023. A rule filing by the Council, WSR 24-03-084, moved it to March 15, 2024 and modified the energy codes to address legal uncertainty after a federal court decision, California Restaurant Association v. City of Berkeley. That's the reason the heat pump story below changed.

A newer 2024 edition is on the way. WSU's Energy Program reports its effective date will be May 3, 2027, with adoption steps still in progress, so what counts as standard may change for homes permitted after that.

Examples of baseline minimums already in the code

0.30

Window U-Factor

Maximum, lower is better

R-60

Ceiling Insulation

Minimum

R-30

Floor Insulation

Minimum

R-20+5

Above-Grade Walls

Or R-13+10

Those come from the prescriptive path in WSU's single-family compliance worksheet, which WSU describes as the typical compliance approach. Builders can comply other ways, but the point stands: insulation and window quality at this level isn't an upgrade, it's the starting line.

Is a Heat Pump Required in Every New Washington Home?

Not as a flat rule anymore, but the code strongly nudges toward one

When the 2021 code was first adopted, it was widely reported that heat pumps would be required for space and water heating in new homes. That's what I'd read too. But the version in force since March 15, 2024 works differently. Under the WSU worksheet, each home must earn a minimum number of energy credits, and the builder picks the combination.

5.0

Small Home

Under 1,500 sq ft with under 300 sq ft of windows

8.0

Medium Home

Most homes

9.0

Large Home

Over 5,000 sq ft

The credit for the primary heating source shows why heat pumps are common without being mandatory. Per the worksheet, a heat pump system earns 3.0 credits, a heat pump with supplemental heating earns 1.5, electric resistance with a ductless mini-split heat pump in the largest zone earns 2.0, electric resistance alone earns 0.5, and minimum-efficiency combustion heating earns 0. A builder using gas heating isn't barred, it just has to earn the full credit total from other measures. Other credit options include a more efficient envelope, air sealing and ventilation, efficient water heating, solar, and an appliance package.

I'm not taking a side on heating fuels here, there's plenty of debate elsewhere. What matters for you is that "energy efficient" in a brochure doesn't tell you what's in your home. The permit drawings are required to identify which credit options the builder selected and their point values, so that's the document to ask about.

What Does Washington Require for EV Charging in a New Home?

A circuit, not a charger

What Does Washington Require for EV Charging in a New Home?

The Washington State Residential Code, adopted in chapter 51-51 WAC, includes Section R309.6.2. It says a minimum of one 40-ampere dedicated 208/240-volt branch circuit must be installed in the electrical panel for each dwelling unit, and that the circuit must end at a junction box, a receptacle outlet, or EV charging equipment. The State Building Code Council's code language includes exceptions, for example where there's no public utility or commercial power supply, so check how it applies to a specific home.

What that does and doesn't mean for you:

Required: the dedicated circuit and the panel space for it.

Not required: the charger itself. That's usually your purchase and installation.

Worth asking: where in the garage the circuit ends, whether it ends at an outlet or a junction box, and what size the main panel is.

So when a builder lists "EV-ready" as a feature, it's accurate, and it's also what the state requires of every new home. It isn't a premium feature you should pay extra for.

What's Not Required, So It's a Real Upgrade or a Real Negotiation?

Where the code stops

The EV charger. The circuit is required, the equipment isn't.

Solar panels. Solar is an optional credit under the energy code, up to 4.5 credits, not a requirement.

More credits than the minimum. A builder choosing a higher-efficiency package beyond the required total is going past code.

Smart-home devices. Smart locks, cameras, voice assistants, and similar equipment aren't part of the code requirements I reviewed, so treat them as selections and prices to compare.

Appliance packages. Optional, with a small credit option in the code.

These are exactly the items that show up on a design center selection sheet. I walk through how to prioritize and track them in Design Center 101, and every one of them should be written into the builder's purchase agreement, not described in a flyer.

How Do You Find Out What's Actually in Your Home?

Seven questions, answered in writing

Which energy code edition is my home permitted under?

Can I see the energy credit options selected for my home on the permit drawings?

What is the primary heating system, and what water heating option was selected?

Can I get the final compliance documents, such as the blower door air-leakage test results and the insulation certificate? WSU's code forms list these among the required documents.

Where does the EV circuit end, what does it terminate to, and how big is the main panel?

Which features listed as "included" or "efficient" are simply code minimums, and which go beyond?

What's priced as an upgrade at the design center, and is it written into my contract?

Timing matters here. Insulation, air sealing, and the EV conduit are all hidden once drywall goes up, which is why the pre-drywall walkthrough is your one chance to see them. And since a new home's code-built efficiency is part of what you're paying for, it belongs in the comparison covered in new construction versus resale in Vancouver, WA. Having your own inspector review the home is worth it either way, as covered in is an inspection necessary on new construction.

Bottom Line

Know the Baseline Before You Pay for the Upgrade

Washington's code already sets a high baseline for insulation and windows, requires an EV charging circuit in every new home, and lets builders earn their remaining efficiency credits through a menu of choices. That makes "energy efficient" and "EV-ready" accurate but not special. Ask what credits were selected, what the EV circuit terminates to, and which features are code versus true extras, and put the answers in writing. Remember the 2024 code is scheduled for May 3, 2027, so the baseline will keep moving.

Frequently Asked Questions

Washington energy code and EV requirements, common questions

What energy code applies to new homes in Washington?

The 2021 Washington State Energy Code, Residential (WSEC-R), second edition, effective March 15, 2024. It covers detached one- and two-family homes and townhouses. A 2024 edition is scheduled to take effect May 3, 2027.

Are heat pumps required in new homes in Washington?

Not as a flat rule under the code in force since March 15, 2024. Builders must earn a minimum number of energy credits, 8.0 for a typical home and 5.0 for a small one, and heat pump heating earns the most credit for the heating source (3.0), while minimum-efficiency combustion heating earns none. Ask your builder which options were selected.

Does Washington require new homes to be EV-ready?

Yes. The Washington State Residential Code requires one 40-ampere dedicated 208/240-volt circuit in the panel for each new dwelling unit, ending at a junction box, outlet, or charging equipment. It doesn't require the charger itself, and some exceptions apply.

Is an EV charger included in a new construction home?

Not by code. The required item is the circuit. Whether a builder includes a charger is a separate choice, so ask and get it in writing.

How can I see which energy credits my builder chose?

The code requires the building permit drawings to identify which energy credit options were selected and their point values. Ask your builder for that information, along with the final compliance documents such as the blower door test results and insulation certificate.

Do these requirements apply to townhomes?

Yes. The WSU Energy Program's single-family worksheet states the requirements apply to detached one- and two-family dwellings and townhouses.

Comparing Builder Packages and Not Sure What's Real?

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This page summarizes published Washington State code and WSU Energy Program compliance forms and is not technical or legal advice. Codes, effective dates, and local administration change; confirm details for a specific home with your builder and the City of Vancouver or Clark County building department. Information current as of October 2026 and subject to change.

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Cassandra Marks

+1(503) 884-2387

Realtor, Licensed in OR & WA License ID: 201225764