What is an IDX website, and do you actually need one?

What is IDX in real estate, in plain English?

Your MLS is a private database. Every listing broker in your market puts their listings in it. IDX is the deal that lets every participating broker show everyone else's listings on their own website, as long as they follow the MLS's display rules.

That's the whole trick. No software, no magic. Permission plus a data feed.

It started as broker reciprocity. The National Association of REALTORS® approved the policy in 2000, and the idea was simple: I show your listings, you show mine (NAR, IDX Background and FAQ). The name changed to IDX. Today it's Policy Statement 7.58 in NAR's Handbook on Multiple Listing Policy, most recently updated for January 1, 2026.

So an IDX real estate website is just a site with that feed plugged in. A buyer can search homes for sale in your market without leaving your site.

IDX vs MLS vs VOW vs RETS: the alphabet soup

Four acronyms, one headache. Here's the short version.

IDX vs MLS. The MLS is the source. IDX is the public window into it. You don't "get the MLS on your site." You get the IDX slice, which leaves out things like showing instructions and security info (NAR Policy Statement 7.58).

VOW vs IDX. A VOW sits behind a login. NAR's VOW policy says every user has to register with a name, a verified email and their own password, and agree to terms of use (NAR, Policy Statement 7.91). It's built for brokers who work with clients online and want a members-only search. If you're a solo agent, IDX is the one you care about.

RETS vs RESO Web API. RESO, the industry standards group, has deprecated RETS. Its June 2026 transition report says MLS feeds already converted to the Web API cover 62.4% of U.S. subscribers. You'll never touch either one. Your IDX provider does.

Is Zillow an IDX website?

Mostly, yes, these days. Zillow became a licensed brokerage and switched to receiving IDX feeds as an MLS participant, with the change landing in early 2021 (CRMLS, November 2020). Before that, it got listings through separate syndication deals.

So Zillow and your site can pull from the same pool. The difference? Zillow has two decades of traffic and brand behind it. Your site has you. Which brings us to the real question.

Is IDX worth it for a solo agent?

Here's what agents keep asking each other: why would a buyer search my site when the big portals have the same homes and a better app?

Mostly, they won't. Not at first. Nobody wakes up and types your name into Google to start a home search. Portals win the cold search. That's not a knock on your site. It's just how people shop.

But IDX isn't really for strangers. It earns its keep in a few specific spots.

When IDX helps

• Your sphere already sends people your way. A past client refers a friend. The friend lands on your site. If they can browse homes right there, save a search and get alerts from you, they stay with you instead of drifting back to a portal.
• Listing alerts. A buyer who saves a search on your site gets new matches from you, with your name on every email. A steady, quiet reason to stay in touch.
• Leads you own. When someone registers on your IDX search, the contact comes to you (or your CRM), not to a portal that sells that lead to whoever pays.
• Local search pages. A page for one neighborhood or one condo building, with your own writing and the live listings underneath, can show up in Google for searches the portals cover poorly.
• You run ads or post on social. If you're sending people to your site anyway, IDX gives them something to do once they land.

When IDX doesn't help much

• You mostly work listings, not buyers. Sellers want your track record and how you market a home. They don't need to search inventory on your site.
• Your business is referrals and your site is a credibility check. Plenty of agent sites exist so a referral can Google you, see a real professional and call. IDX adds nothing to that job.
• You won't send anyone to it. IDX isn't traffic. A search tool on a site nobody visits is an expensive feature nobody uses.
• You're paying monthly for a feed you never open. Agents on forums describe this one a lot: they signed up because it sounded mandatory and never checked a single lead.

Bottom line: IDX keeps buyers who already found you. It won't beat the portals at their own game.

How do you get IDX on your website?

Three parties have to say yes, and you pay one of them every month.

1. Your broker signs off. IDX runs under your brokerage's MLS membership, so you can only use it with your managing broker's consent and under their control (NAR Policy Statement 7.58). Some brokerages already hand you an IDX search. Ask before you buy one.
2. Your MLS approves the feed. You (or your provider) apply for IDX access with your MLS. NAR's policy says MLSs must act on IDX feed requests within five business days, barring extenuating circumstances. Expect a signed agreement and, often, an application fee.
3. You pick an IDX provider. That's the company that takes the raw feed, keeps it updated, applies your MLS's display rules and gives you search pages, listing pages and saved searches. You sign up with them directly and pay them monthly.
4. Your website connects to it. Whoever builds your site plugs the provider's search into your pages, sets up where leads go and checks that the display rules are met.

Plan on one to three weeks from application to live. How fast depends on your MLS and your broker.

How much does IDX cost?

IDX is usually two bills: one to the MLS side, one to the IDX provider.

The provider and setup ranges come from Project Cost Estimator's 2026 IDX cost breakdown. MLS fees differ by market, so your MLS's own fee page gets the final word. For most solo agents, the monthly total lands somewhere in the $30 to $200 range once everything's running.

Two things to watch. First, some platforms bundle IDX into a site you rent monthly. Cancel the site and you lose the search, the pages and sometimes the leads. Second, "free IDX" usually means the cost is hiding in a bigger monthly bill somewhere else.

Iframe vs integrated IDX, and why it matters for SEO

Real estate agent websites with IDX aren't all wired the same way. How the feed is connected decides whether Google gives your site any credit for it.

Google's John Mueller has said Google does try to include iframed content in the page that hosts it, "if it's allowed," but that it's "not always trivial," and that anything you really want indexed should sit directly on the page (Search Engine Journal, April 2023).

Here's the part most IDX articles skip: even integrated IDX rarely ranks on its own. The listing description on your site is the same text on thousands of other sites, every portal included. Google has no reason to pick yours. What ranks is what you wrap around the feed: a neighborhood page you wrote, your take on the schools and the commute, the homes you've sold there. The feed fills the page. Your writing earns the ranking.

So if SEO is why you want an IDX website, budget for the writing, not just the plugin.

Can you add IDX to an existing website?

Usually, yes. You don't need a new site just to get listings on it.

• If your site runs on a common website platform, most IDX providers offer a plugin or an embed code. Paste it in, style it, done. That's typically an iframe or a light integration.
• If your site is custom-built, a developer can connect the provider's search pages to your domain and match them to your design.
• If your site is rented from a platform, check first. Some platforms only allow their own built-in IDX, and some don't allow outside IDX at all.

The one case where adding IDX means rebuilding: your current site can't take outside code, or you want integrated, on-domain listing pages and your setup can't handle them.

IDX rules: what your MLS will check

Every MLS writes its own rules on top of NAR's policy, so read yours. These basics come straight from NAR Policy Statement 7.58 (effective January 1, 2026):

• Show the listing brokerage on every listing. Every IDX listing must name the listing firm, plus an email or phone number the listing firm provided, somewhere reasonably prominent, in type no smaller than the median type used for the listing data.
• Name your own brokerage. Your site has to clearly identify the brokerage you work under.
• Refresh the data at least every 12 hours. Status changes (pending, sold, withdrawn) have to show up automatically. A good provider handles this for you.
• Don't edit other brokers' listings. Their photos, prices and descriptions stay exactly as they are.
• No confidential fields. Showing instructions, security details and similar info never go on a public site.
• Honor opt-outs. Sellers can tell their broker to keep a listing off the internet, and brokers can refuse to share their listings through IDX (if they do, they can't show everyone else's either).
• Disclaimers. Many MLSs require a notice that the data is "deemed reliable but not guaranteed accurate."
• Mixed sources. Since January 2026, NAR's rules say listings from other sources must be shown separately from IDX listings, or clearly labeled with where they came from (NAR, Summary of 2025 MLS Changes).

One more: under NAR's Multiple Listing Options for Sellers policy, some listings may now be delayed from public IDX display at your MLS's discretion. If a listing's on your MLS but not on your site yet, that may be why.

Your license number, brokerage and Fair Housing logo on the site itself fall under a separate set of rules from your state and brokerage. Get both right.

IDX and ownership: what's actually yours

Skip the feature lists for a second. This is the part that bites later.

The feed isn't yours. It's licensed. Your MLS and your broker let you display it under their rules, and it goes away if you change brokerages, leave the MLS or stop paying the provider. True for every agent, on every website.

Your site and your leads can be yours. Whether they are comes down to how you set things up:

• Your domain is registered in your name.
• The IDX plan is in your name, with your login, so you can cancel or switch providers yourself.
• Leads from the IDX search go to your email or your CRM, and you can export them any time.
• The website around the feed (your pages, your writing, your photos) is yours to move.

Change brokerages? Swap the broker details, reapply for the feed under the new brokerage, keep going. Your site, your domain and your contacts stay put. Compare that to a rented platform where the site, the IDX and the leads all sit in one account you don't control.