Many IDX plugins show listings in frames that search engines can't index and that look nothing like your brand.
Codersarts MLS and IDX integration brings listings into your own website and apps as fast, branded, indexable pages, while following your MLS's rules.
What Is MLS and IDX Integration?
A Multiple Listing Service (MLS) is a database of properties shared by brokers in a market. Internet Data Exchange (IDX) policies let brokers display other members' listings on their websites. Integration pulls listing data through feeds or the RESO Web API, keeps it synced, and displays it with the attribution, disclaimers and refresh rules each MLS requires.
Access requires approval from your MLS, and rules differ by MLS. We work within those rules and your agreements.
Who This Is For
Brokerages and teams in MLS markets
Agents wanting branded listing search
Proptech products using listing data
Brokerages replacing framed IDX plugins
Portals aggregating multiple MLSs
What We Integrate
Data access
RESO Web API or IDX feeds, with credentials from your MLS or vendor.
Sync
Incremental updates for new, changed, sold and removed listings.
Media
Photos and virtual tour links, optimized for speed. See CDN setup.
Search
Filters, map search and saved searches.
SEO pages
Server-rendered listing and neighborhood pages. See technical SEO.
Compliance
Attribution, disclaimers and display rules per MLS.
Leads
Enquiries routed to agents. See CRM integration.
Integration Options
Option | Best for | Trade-offs |
|---|---|---|
Framed IDX plugin | Quick start | Poor SEO and limited design |
IDX vendor API | Agents and small brokerages | Vendor fees and limits |
Direct RESO Web API | Brokerages and portals | More development and approvals |
Common MLS Integration Problems We Fix
Problem | Usual cause | Fix |
|---|---|---|
Listings not indexed | Framed IDX | |
Sold listings still showing | Incomplete sync | |
Slow photo galleries | Unoptimized media | |
Slow search | Unindexed database |
How Much Does MLS Integration Cost?
Cost depends on data access method, number of MLSs, search features and SEO pages. MLS and vendor fees are separate.
Scope | Typical timeline | Typical cost |
|---|---|---|
IDX vendor integration on your site | 2 to 4 weeks | $4,000 to $12,000 |
Direct RESO Web API integration | 6 to 10 weeks | $15,000 to $40,000 |
Multi-MLS listing platform | 3 to 6 months | $40,000 to $120,000 |
What changes the cost: access method, number of MLSs, sync frequency, search and maps, SEO pages and compliance requirements.
Ranges are typical for a global team. Your price is fixed after scoping, before any work starts.
Ways to Start Small
Starting point | Best for | From |
|---|---|---|
Getting listing pages indexed | $199 | |
A ranked bug list for an existing platform | $199 | |
Ongoing fixes with a fixed budget | $290 for 10 hours |
How We Work
Access. Approvals and credentials from your MLS.
Model. Map listing fields to your data model.
Sync. Initial import and incremental updates.
Display. Search, listing pages and compliance.
Test. Data accuracy and display rules.
Monitor. Sync health and alerts.
What You Receive
Live MLS listings on your site
Search and SEO-friendly pages
Compliant display
Sync monitoring
Documentation and code ownership
Example Engagement: Replacing a Framed IDX Plugin
An illustrative example based on the pattern we see most often. Client details are kept confidential.
The situation: A brokerage's framed IDX plugin brought no search traffic and slowed the site.
What we did:
Integrated listings through the RESO Web API
Built server-rendered listing and neighborhood pages
Added required attribution and disclaimers
The result: Listing pages started earning search traffic, and leads came through the brokerage's own site.
Mistakes to Avoid
Relying on framed IDX for SEO
Not removing sold or withdrawn listings promptly
Missing attribution
Syncing everything every time
Why Codersarts
Web, mobile, integration and AI engineers in one team
Search, speed and SEO treated as engineering work
Fixed-price tasks for small jobs, so you can start without a large contract
Payments, data protection and integrations handled properly
You own all code, data and accounts
Frequently Asked Questions
What is the RESO Web API?
A standard API for accessing MLS listing data, replacing older RETS feeds.
Do we need MLS approval?
Yes, access and display follow your MLS's rules and agreements.
Will listings help our SEO?
Yes, when shown as server-rendered pages on your domain.
How much does it cost?
A direct RESO Web API integration typically costs $15,000 to $40,000.
Related Pages
Real estate website development: the site around listings.
Real estate app development: listings on mobile.
Real estate solutions: every real estate service in one place.
Show Live Listings on Your Own Site
Tell us about your MLS and goals, and we'll plan the integration.