Across 51 service categories and seven NZ markets, 741 businesses hold a perfect 5.0 star rating and still do not rank in the Top 5. They rank below it, with an average of 39 reviews each. Rating alone does not determine rank. The number of reviews matters, and how much it matters depends on the category.
The review floor varies 24-fold across categories
To reach position 5 in veterinary care, a business needs an average of 263 reviews. In mortgage broking, 259. In mechanics, 256. At the other end, an architecture practice can reach position 5 with around 11 reviews, and a graphic designer with 23. When we first ran this analysis in April the spread was tenfold; the addition of high-volume categories like vets, dentists, and moving companies, and low-volume ones like architects, has widened it to 24-fold.
The review count needed to crack the Top 5 ranges from 11 in architecture to 263 in veterinary care, a 24-fold difference across the same ranking system.
One possible explanation is how established the review culture is in each category. Vets, mechanics, and mortgage brokers serve large volumes of customers repeatedly, accumulating reviews over many years. Architects and graphic designers work with a handful of clients on long engagements, and far fewer of those clients ever write a review.
| Category | Avg reviews at #5 | Avg reviews at #1 |
|---|---|---|
| Veterinarians | 263 | 418 |
| Mortgage brokers | 259 | 755 |
| Mechanics | 256 | 369 |
| Moving companies | 241 | 729 |
| Dentists | 226 | 550 |
| Plumbers | 214 | 804 |
| Real estate agents | 160 | 708 |
| Electricians | 139 | 299 |
| House washing | 92 | 297 |
| Roofers | 42 | 154 |
| Graphic designers | 23 | 119 |
| Architects | 11 | 32 |
In some categories, rating quality is the real differentiator
In most categories, the star rating barely moves between position 1 and position 10. Marketing agencies and SEO agencies show no gap at all: rank 1 and rank 10 both average 4.99. Electricians show 0.07. Volume is doing almost all the work.
In other categories, rating quality creates meaningful separation. Criminal lawyers show a 0.55-star gap between rank 1 (4.85) and rank 10 (4.30). Law firms, pest control, and kitchen renovators are all near 0.26. There, a lower rating on its own makes a business less competitive.
One category runs backwards. The average #1 car detailer holds a lower rating than the average #10 (4.67 against 4.90) but more than five times the reviews (552). Sheer volume is carrying the leaders.
In criminal law, the rating gap from rank 1 to rank 10 is 0.55 stars. In marketing agencies, it is zero. Volume and rating play very different roles depending on the category.
Leading the category requires substantial separation
Reaching position 5 and reaching position 1 are different problems. Across all categories, the average #1 business holds 296 reviews at 4.90 stars. The average #5 holds 89 reviews at 4.86 stars. In volume-driven categories, the gap is larger still: the leading plumber averages 804 reviews versus 214 at position 5. The leading property manager averages 843 versus 147.
In categories where a small number of businesses have accumulated very large review counts over many years, catching the leader on volume alone is a long-term project. The scoring formula compresses volume logarithmically so that this never becomes insurmountable, but an established review base still compounds.
What this means for businesses trying to improve their ranking
In low-volume categories (creative services, architecture, some legal), a business with a strong rating and a consistent review-gathering habit can reach the Top 5 relatively quickly. In high-volume categories (trades, health, property, automotive), review count is the primary constraint and improving it is a multi-year effort.
Where rating spread is wide (criminal law, pest control, moving), managing complaint rates is as important as accumulating reviews. Where it is narrow (electricians, marketing agencies), volume is almost the only variable that moves.
The review counts here are averages across city contexts, so they describe what a Top 5 business typically holds rather than a threshold any one market applies. Individual markets fall well either side of them.
Methodology: Top5.nz analysed 5,656 businesses across Auckland, Wellington, Christchurch, Hamilton, Tauranga, Napier/Hastings, and Dunedin using the most recent ranking snapshot per context as of July 2026. Businesses were included only if they had a minimum of three reviews and a rating of 3.5 stars or above at the time of indexing (the floor rose to 4.0 in May 2026, so snapshots crawled after that apply the higher bar). National NZ aggregates and Auckland sub-locations were excluded to avoid counting the same business more than once. Averages at each rank position are calculated across all city contexts for each category. Review counts and ratings reflect data at the time of the most recent crawl for each context. This article updates an April 2026 analysis of 2,982 businesses across 35 categories using the same method. Full ranking methodology: top5.nz/how-we-rank.