Market Snapshot
Not one of Calgary's 416 tracked plumbers has completed platform verification. That single fact defines the market.
Calgary plumbers average 42.0/100 on the AI Trust Score, a composite of identity consistency (25 points), legitimacy signals like reviews and licensing (35 points), and website readability including structured data (40 points). The score is marginal by any measure, but it sits above the provincial median of 35.0/100 for Alberta's 3,600 tracked contractors.
The city-level picture is less flattering. Calgary's average of 36.8/100 places it among Alberta's five lowest-scoring cities, trailing the provincial average of 38.5/100. Priddis leads the province at 59.0/100. Calgary is not close.
Structured data adoption tells a similar story. Only 7% of Calgary plumbers have implemented JSON-LD on their websites, against a vertical average of 13% across Alberta. JSON-LD is the primary mechanism by which AI systems read and trust business information. Without it, even well-reviewed contractors become invisible to AI-generated recommendations.
Website presence is the one relative bright spot: 82% of Calgary plumbers have a website. The problem is that having a website and having a readable, AI-indexable website are two different things.
Key figures at a glance:
| Metric | Calgary Plumbers | Alberta Vertical Avg |
|---|---|---|
| Tracked contractors | 416 | 3,600 |
| Average AI Trust Score | 42.0/100 | 38.5/100 |
| Verification rate | 0% | 0% |
| JSON-LD adoption | 7% | 13% |
| Website presence | 82% | 74% |
AI-powered search tools, including voice assistants and LLM-based recommendations, increasingly pull from structured, verified data sources. Contractors without that foundation are not being filtered out by consumers: they are simply not appearing at all.
Browse the full Calgary plumber directory or check your own standing at /find.
Score Distribution
Calgary's score distribution concentrates heavily at the extremes. Among the 20 contractors returned in the top sample, all scored between 86 and 88 out of 100. The broader Alberta histogram shows why that matters: 59% of plumbers across the province score below 40, and no contractor in the dataset has cracked 90.
The Alberta-level tier breakdown provides the clearest frame for understanding Calgary's position:
| Score Tier | Label | Alberta Share | Alberta Count (est.) |
|---|---|---|---|
| 80-100 | Excellent | 10.2% | ~367 |
| 60-79 | Good | 14.9% | ~536 |
| 40-59 | Fair | 49.6% | ~1,786 |
| Below 40 | Poor | 25.3% | ~911 |
Within the below-40 band, the concentration is severe. The 0-9 range alone holds 337 contractors (9% of Alberta's tracked base). The largest single band is 30-39, covering 863 contractors (24%). These are not businesses with minor gaps. They are functionally absent from AI-generated recommendations.
What the Three Score Categories Reveal
The AI Trust Score is built from three components. Understanding them explains where Calgary plumbers are losing points.
Identity (25 points): Consistency of business name, address, and phone number across the web. Discrepancies between Google Business Profile, website, and directory listings erode this score.
Legitimacy (35 points): Review volume, star ratings, and license or insurance verification. This is the single heaviest category and the one where most contractors leave points on the table.
Readability (40 points): Website quality, JSON-LD structured data implementation, and mobile-friendliness. At 40 points, this is the largest scoring block. Calgary plumbers' 7% JSON-LD adoption rate means the majority are surrendering most of this category by default.
The Gap Between Top and Bottom
The performance comparison data is direct. Alberta's top 10% of contractors average 81.1/100 and carry 45 reviews on average. The bottom 50% average 20.9/100 with just 6 reviews. That is a 7x review gap between those two groups.
Review volume correlates with Legitimacy score, which accounts for 35 of the 100 available points. A contractor sitting at 6 reviews is not just less credible to a homeowner: they are mathematically constrained from reaching a competitive score.
Calgary's 7% JSON-LD adoption trails Alberta plumbers overall (13%) and falls below both roofers (12%) and foundation contractors (8%) at the provincial level. The Readability category is 40 points. Contractors ignoring structured data are competing with one hand behind their back in a category that represents the plurality of the score.
The Alberta plumber vertical averages 41.9/100. Calgary's 42.0/100 matches that almost exactly, suggesting no structural advantage for the city despite its larger contractor base.
Contractors looking to understand their exact position across all three categories can pull their full breakdown at /find. For homeowners evaluating options, the Calgary plumber hiring guide covers what these scores mean in practice.
Top Performers
Six Calgary plumbers share the market's highest recorded score of 88.0/100. A further four sit at 86.0/100. All ten are unverified. No plumber in the dataset has reached 90.
| Rank | Contractor | AI Trust Score | Status | Rating |
|---|---|---|---|---|
| 1 | Comfort Union | 88.0/100 | Unverified | 4.9 stars (200.0 reviews) |
| 2 | Instant Plumbing & Heating Ltd | 88.0/100 | Unverified | 4.8 stars (840.0 reviews) |
| 3 | Son-Rise Plumbing & Gasfitting Ltd. | 88.0/100 | Unverified | 4.8 stars (285.0 reviews) |
| 4 | Alberta Indoor Comfort | 88.0/100 | Unverified | 4.4 stars (442.0 reviews) |
| 5 | ProStar Plumbing & Heating | 88.0/100 | Unverified | 4.7 stars (2254.0 reviews) |
| 6 | Sewerheroes Ltd. | 88.0/100 | Unverified | 5.0 stars (84.0 reviews) |
| 7 | High Mark Plumbing & Heating | 86.0/100 | Unverified | 4.4 stars (71.0 reviews) |
| 8 | OFFICIAL PLUMBING & HEATING | 86.0/100 | Unverified | 4.8 stars (284.0 reviews) |
| 9 | Yeti Plumbing and Heating | 86.0/100 | Unverified | 5.0 stars (93.0 reviews) |
| 10 | Prodigy Mechanical Ltd | 86.0/100 | Unverified | 4.9 stars (70.0 reviews) |
ProStar Plumbing & Heating leads the market on review volume by a substantial margin: 2,254 reviews at 4.7 stars. That depth of legitimacy signal is the primary reason it reaches 88.0/100 despite sharing a score with contractors carrying far fewer reviews. Instant Plumbing & Heating Ltd is the second most-reviewed contractor in the top ten at 840 reviews, also at 4.8 stars.
On ratings, Sewerheroes Ltd. and Yeti Plumbing and Heating both hold perfect 5.0-star averages, across 84 and 93 reviews respectively. That combination of rating consistency and review volume places both in the top ten despite lower absolute review counts than several peers.
The shared ceiling of 88.0/100 reflects a structural gap. The Readability category is worth 40 points, and 7% JSON-LD adoption across Calgary plumbers means even the market's best performers are leaving structured data points unclaimed. Verification adds further weight to the Legitimacy category. Every contractor in this table is currently unverified, meaning the gap between their current scores and a potential 90+ is addressable.
Contractors in this group can view their full breakdown, including exactly which Identity, Legitimacy, and Readability signals are missing, at /find. Homeowners comparing these contractors can review the Calgary plumber hiring guide for context on what each score component means in practice.
What This Data Means for Homeowners
Every one of Calgary's 416 tracked plumbers is unverified. Not a few stragglers: every single one. For homeowners, that means no contractor in this market has had their license, insurance, or business identity confirmed through the platform. You are starting from zero on that signal regardless of who you call.
The market average of 42.0/100 places most Calgary plumbers in the Fair scoring range. Fair means partial signals: a website exists, some reviews are present, but structured data, verification, and identity consistency are typically incomplete. A Fair-range contractor is not automatically unreliable. It does mean AI tools are reading their information poorly, and that gaps in their digital record remain unresolved.
Score thresholds in practical terms:
- 80-100: Strong identity consistency, substantial review volume, structured data implemented. The top performers in Calgary cluster here.
- 60-79: Reasonably complete profiles with some gaps. Likely has a website and reviews but may lack JSON-LD or verified credentials.
- 40-59: Mixed signals. May have a website but little else working in their favor.
- Below 40: High probability of missing website, zero or near-zero reviews, no structured data. The bottom 50% of Alberta plumbers average just 6 reviews.
Red flags to watch for:
- Score below 40
- No website (18% of Calgary plumbers have none)
- Zero or near-zero reviews
- No JSON-LD structured data (93% of Calgary plumbers lack it)
- Unverified status
The review gap matters beyond AI scoring. Top-performing Alberta contractors average 45 reviews against 6 for the bottom half. That 7x difference reflects real customer feedback volume, not just a data point.
AI Trust Scores are a starting filter, not a final decision. A contractor scoring 88.0/100 still warrants a direct conversation about licensing, insurance, and project scope before you hire. Use the score to build your shortlist, then apply standard vetting: ask for proof of license, request references, confirm insurance coverage.
The Calgary plumber hiring guide explains what each score component means in the context of a real hiring decision. To check the score of any specific contractor before you call, search by business name at /find.
Frequently Asked Questions
How many plumbers are tracked in Calgary?
VerifiedNode tracks 416 plumbers in Calgary. All 416 are unverified as of March 2026. That 0% verification rate holds across the full market, not just smaller operators. For the complete list, see the Calgary plumber directory.
What is the average AI Trust Score for Calgary plumbers?
Calgary plumbers average 42.0/100. That figure sits slightly above the Alberta provincial average of 38.5/100 and the provincial median of 35.0/100, but it still falls within the Fair scoring range. A 42 indicates partial digital signals: a website likely exists, some reviews are present, but structured data and verification are typically missing. See how Calgary compares to other Alberta cities in the Alberta state report.
What is the highest score any Calgary plumber has reached?
The highest recorded score in Calgary is 88.0/100, held by six contractors: Comfort Union, Instant Plumbing & Heating Ltd, Son-Rise Plumbing & Gasfitting Ltd., Alberta Indoor Comfort, ProStar Plumbing & Heating, and Sewerheroes Ltd.. No Calgary plumber in the dataset has cracked 90. Every contractor in this group is unverified, meaning the gap between 88 and a potential 90+ is structurally addressable.
Why do so few Calgary plumbers appear in AI-generated recommendations?
Only 7% of Calgary plumbers have implemented JSON-LD structured data on their websites. JSON-LD is the primary signal AI systems use to read and trust business information. Without it, a contractor with a functional website and strong reviews can still be invisible to voice assistants and LLM-based search tools. The Readability category is worth 40 of the 100 available points: low JSON-LD adoption means most Calgary plumbers are forfeiting the plurality of their potential score by default.
Which Calgary plumber has the most reviews?
ProStar Plumbing & Heating leads on review volume with 2,254 reviews at a 4.7-star average. That review depth is the primary driver of its 88.0/100 score. The city-wide picture is less robust: Alberta's bottom 50% of contractors across the province average just 6 reviews.