How Canadian MLS data works
MLS in Canada is not a single national database you can simply plug into. The word MLS, along with REALTOR and the associated logos, are trademarks owned by the Canadian Real Estate Association, known as CREA. Listing information is entered by members into local real estate board systems, and those boards decide how the data is shared with member websites.
There are two common ways for that data to reach your WordPress site. The first is CREA's national feed, the Data Distribution Facility, usually shortened to DDF. The second is a feed direct from your local board, delivered through the older RETS standard or the newer RESO Web API. A plugin is only useful if it can connect to the feed you are actually entitled to use.
Before you compare plugins, confirm three things with your brokerage and board:
- Which feeds your membership grants access to, DDF, a board IDX feed, or both.
- Whether you are approved for IDX display, which shows other members' listings publicly.
- What credentials the board will issue, and whether they support RETS, the RESO Web API, or both.
CREA DDF vs board RETS and RESO feeds
Understanding this difference is the single most important decision in a Canadian MLS project, because it shapes what listings you can display and how current they are.
CREA DDF
DDF is a national feed that aggregates listings from participating boards across Canada. It is available to CREA members and is designed to let a REALTOR display listings on their own website with member consent. DDF is simpler to obtain and gives national reach, but it carries a subset of fields, and some agents choose not to distribute their listings through it, so coverage is not always complete for every board.
Board RETS and RESO feeds
A direct board feed usually gives richer data and more listings for that market, often with more frequent updates. RETS, the Real Estate Transaction Standard, is the legacy method and delivers data as XML. The industry is steadily moving to the RESO Web API, a modern interface based on OData that returns JSON and follows the RESO Data Dictionary for consistent field names. Newer boards may offer the RESO Web API only.
In plain terms: DDF is easier and national but lighter, while a board feed is richer and local but involves a board application and stricter rules. Many Canadian brokerages run DDF first, then upgrade to a board feed as they grow.
Plugin options for Canadian realtors
Plugins for Canadian sites fall into a few groups. None is best for everyone, so match the type to your feed and goals.
- DDF-focused plugins. A handful of plugins are built specifically to pull the CREA DDF feed into WordPress and create indexable listing pages. These are the fastest route to a compliant Canadian listing site.
- General IDX plugins with Canadian support. Some larger IDX platforms support Canadian boards, but many were designed for US feeds first, so confirm they handle your board's RETS or RESO Web API and the required Canadian disclaimers.
- Iframe or hosted widget plugins. These embed a search from a third-party server. They are quick to set up but the listing pages usually live on someone else's domain, which limits SEO value.
- Custom integrations. A developer connects your board's RESO Web API or RETS feed directly and builds native WordPress listing pages. This gives full control of speed, design and SEO, and is the route brokerages take when listings are core to their growth.
If your priority is ranking for local search, native listing pages beat embedded widgets, whether they come from a good DDF plugin or a custom build.
What to check before you buy
Plugin sales pages rarely mention Canadian specifics, so run through this checklist before you commit.
- Feed compatibility. Does it support CREA DDF, board RETS, and the RESO Web API, and specifically your board?
- Native pages. Does each listing become a real WordPress page with its own URL and editable meta, or is it locked inside an iframe?
- Update frequency. How often does it sync, and does it remove sold or expired listings promptly, which boards require.
- Field mapping. Can you display the fields your buyers care about, and does it follow the RESO Data Dictionary where relevant.
- Performance. Does it cache data locally so pages load fast, rather than calling the feed on every visit.
- Ownership. If you leave the plugin, do your listing pages and SEO value stay on your domain.
A plugin that fails on native pages or performance can cost you more in lost rankings than it saves in setup time.
Compliance and disclaimers
Because MLS and REALTOR are CREA trademarks, and because boards license their data under strict terms, a Canadian listing site has obligations a generic plugin will not enforce for you. Get these right from the start.
- Display the required attribution and trademark notices for MLS, REALTOR and the associated logos as your board and CREA specify.
- Show the data source and any board-required disclaimer text on listing pages.
- Keep listings current and remove them on the schedule your feed agreement requires.
- Respect agent opt-outs, so listings that are not authorized for display never appear.
- Follow the display rules for IDX versus VOW, since a Virtual Office Website that shows fuller data usually requires visitor registration.
Always confirm the exact wording with your board and brokerage. The right plugin or integration makes it easy to insert and maintain these notices site wide.
Speed and SEO pitfalls
This is where many Canadian real estate sites quietly lose. An iframe or remote widget loads content from another server, so Google often sees a thin page on your domain and the rich listing content on someone else's. That limits how well your pages rank and slows the page for visitors.
To keep both speed and search value:
- Prefer solutions that store listing data in your WordPress database and render native pages.
- Cache feed data and images so a busy listing page does not call the API on every load.
- Give each listing a clean URL, a descriptive title, and structured data so it can earn rich results.
- Build indexable location and category pages, for example a neighbourhood or city page, that internal-link to individual listings.
Done well, your MLS pages become an ongoing source of local organic traffic instead of a widget that adds weight without ranking.
Lead capture and CRM routing
A listing site earns its keep when a visitor becomes a lead. Plan the capture path before launch.
- Add clear enquiry and showing-request forms on every listing, plus saved-search and alert options where your feed permits.
- Route submissions to your CRM automatically, so nothing sits in an inbox.
- Track the source of each lead so you know which pages and neighbourhoods produce enquiries.
- Follow Canadian anti-spam rules for consent when you send listing alerts or newsletters.
The plugin choice and the lead system are two halves of the same job. A fast, compliant listing page with no clear path to enquire is a missed opportunity.
Build your MLS site with us
We are a Toronto WordPress studio, part of Four Cents, and we build and integrate MLS and IDX sites for Canadian realtors and brokerages. Whether you want a straightforward CREA DDF plugin setup or a custom RESO Web API integration with native, fast-loading listing pages, we can help you choose the right path and keep it compliant.
Tell us your board, your feed access and your goals, and we will reply within 24 hours with honest, practical guidance and a free consultation. Reach us at info@fourcents.ca or through our contact page.