What MLS integration really means
Integration is the work of connecting an external listing feed to your WordPress site so that listings appear as pages, stay current, and can be searched, saved and enquired on. It is more than pasting an embed code. A proper integration handles authentication with the feed, mapping the incoming fields to your templates, scheduling updates, caching for speed, and enforcing the display rules your board requires.
In Canada the feed on the other end of that connection is controlled by CREA and your local real estate board, so integration starts with getting the right access, not with the code. A plugin that simply drops a search box on the page is not really integrating anything; it is borrowing another company's search. True integration means the listings become part of your site, indexed under your domain, styled to match your brand, and wired into the way you follow up with buyers and sellers.
The Canadian feeds: DDF, RETS, RESO
There are three terms you will meet again and again. Understanding them tells you what an integration can and cannot do.
CREA DDF
The Data Distribution Facility is CREA's national feed. It aggregates listings from participating boards and is available to members so they can display listings on their own site with consent. DDF is the most accessible national option, though it carries a subset of fields and depends on agents choosing to distribute through it.
Board RETS feeds
RETS, the Real Estate Transaction Standard, is the older way boards deliver data, as XML pulled on a schedule. Many Canadian boards still offer RETS, and it typically provides richer local data than DDF. RETS is being retired across the industry, but it remains in service at a number of boards, so a good integration still needs to speak it.
RESO Web API
The RESO Web API is the modern replacement, built on OData and returning JSON, with field names standardized by the RESO Data Dictionary. It is faster to work with and more reliable, and newer boards may offer it exclusively. Where a board provides it, the RESO Web API is usually the better foundation for a long-term integration because it is easier to maintain and less likely to break as the board updates its systems.
Plugin vs custom integration
Most Canadian projects choose between an off-the-shelf plugin and a custom integration. Both can be right depending on scale and goals.
Plugin integration
A good Canadian plugin, especially one built for CREA DDF, can pull the feed, create listing pages and handle basic disclaimers with minimal development. It is the faster and lower-cost route, and it suits individual agents and small teams who want to be live quickly.
- Strengths: speed to launch, lower setup effort, ongoing plugin maintenance.
- Limits: less control over design, field mapping and performance, and some plugins lean on iframes that weaken SEO.
Custom integration
A custom build connects your board's RETS or RESO Web API directly and renders native WordPress pages exactly the way you want. Brokerages that treat listings as a core growth channel usually choose this path.
- Strengths: full control of speed, design, SEO and lead flow, and a data model that fits your market.
- Limits: more upfront work and a developer relationship for updates.
A useful rule: if listings are central to how you win clients, invest in a native integration. If you need a compliant presence quickly, a strong DDF plugin is a sensible start you can upgrade later. Many of our clients begin with a plugin to get live, then move to a custom feed once they see which neighbourhoods and property types actually bring them enquiries.
The integration process step by step
A dependable Canadian MLS integration follows a clear sequence. Skipping steps is where projects go wrong.
- Confirm access. Work with your brokerage and board to secure DDF access or a board feed, and get the credentials and the display rules in writing.
- Choose the feed. Decide between DDF, RETS or the RESO Web API based on coverage, freshness and what your board offers.
- Connect and authenticate. Set up the secure connection and test that data pulls reliably on a schedule.
- Map the fields. Match incoming fields, following the RESO Data Dictionary where relevant, to your listing templates.
- Store and cache. Save listings in the WordPress database and cache images so pages load fast and do not hammer the feed.
- Build the pages. Create native listing pages, plus search, map and location pages that internal-link together.
- Add compliance. Insert the required trademark and data-source disclaimers and the sold or expired removal logic.
- Wire up leads. Connect enquiry forms and saved searches to your CRM, then test the full path.
Each step is testable, so you always know the integration is accurate before launch. We also recommend a staging site where the feed can run against real data for a few days before go-live, which catches mapping and update issues while they are still invisible to the public.
IDX display, lead capture and CRM
IDX, Internet Data Exchange, is the arrangement that lets a member display other members' listings on their own site. Once your listings display correctly, the job is to convert visitors.
- Put an enquiry and a showing-request form on every listing page, above the fold on mobile.
- Offer saved searches and email alerts where your feed and board rules allow, which often means a VOW-style registration for fuller data.
- Route every submission straight to your CRM with the listing and source attached, so follow-up is fast and trackable.
- Respect Canada's anti-spam law by collecting clear consent before sending alerts or newsletters.
A well-integrated site treats display and lead capture as one system, so traffic reliably becomes enquiries.
Compliance and trademark rules
Canadian listing data comes with obligations that a careless integration can breach. Because MLS and REALTOR are CREA trademarks and boards license their feeds strictly, build compliance into the integration rather than bolting it on later.
- Show the trademark attribution and any board-mandated disclaimer on listing pages.
- Identify the data source clearly.
- Update listings and remove sold or expired ones on the schedule your agreement sets.
- Honour agent opt-outs so unauthorized listings never display.
- Apply the correct IDX or VOW display rules for the data you show.
Confirm the exact requirements with your board and brokerage, since terms vary between boards.
Performance and SEO
Integration quality shows up in your Core Web Vitals and your rankings. The common failure is an iframe or remote widget that loads listing content from another domain, leaving a thin page on yours and slowing the visit.
- Render native pages from locally stored data so search engines see the full content on your domain.
- Cache feed responses and images, and load images efficiently, so listing pages stay quick.
- Add structured data for listings so they can qualify for rich results.
- Create city, neighbourhood and property-type pages that internal-link to listings and earn steady local traffic.
Handled this way, your integration is not just a feature, it is an SEO asset that compounds over time.
Get your integration built
We are a Toronto WordPress studio, part of Four Cents, and we integrate MLS and IDX feeds into WordPress for Canadian realtors and brokerages. From a quick CREA DDF plugin setup to a full RESO Web API build with native pages and CRM routing, we will help you pick the right approach and keep it compliant with your board's rules.
Send us your board, feed access and goals, and we will reply within 24 hours with a free, no-pressure consultation. Email info@fourcents.ca or use our contact page.