How much is customer retention worth?

In the original 1990 Harvard Business Review study by Reichheld and Sasser, cutting the customer defection rate by 5% raised profits by 25% to 85% depending on the industry — 85% in a bank branch system, 50% in an insurance brokerage and 30% in an auto-service chain.

Why do referrals outperform advertising for contractors?

Nielsen’s 2021 Trust in Advertising study, covering 40,000 respondents across 56 countries, found 88% of consumers trust recommendations from people they know above every other form of marketing message. A referral arrives pre-trusted, which shortens the sale and reduces price shopping.

How often should a contractor follow up with past customers?

Tie contact to the service life of the work rather than to the calendar. A repaint is due in roughly 7 to 10 years, a water heater in 8 to 12. A short check-in at completion, one at the first seasonal change, then a reminder as the work approaches end of life, costs almost nothing and lands when the need is real.

What is the cheapest way to get more work as a small trade business?

Contacting people who already paid you once. They need no introduction, no trust-building and no ad spend, and the research on defection rates says small improvements in keeping them produce disproportionate profit gains.

Customer retention for contractors: the numbers behind the repeat job

Cutting customer defections by 5% raised profits between 25% and 85% in the industries Harvard Business Review studied in 1990 — 30% in an auto-service chain, closest in shape to a trade business. Meanwhile 88% of consumers trust recommendations from people they know above any advertising. For a small contractor, the cheapest pipeline is the customer list you already have.

What retention is actually worth

The claim you see repeated everywhere — “a 5% increase in retention raises profits 25–95%” — traces back to a single piece of research: Frederick Reichheld and W. Earl Sasser's 1990 Harvard Business Review paper Zero Defections: Quality Comes to Services. The original finding was that cutting the defection rate by 5% raised profits by 25% to 85%, and the paper broke that down by the businesses studied.

85%Bank branches
50%Insurance broker
30%Auto service

Profit increase from cutting the customer defection rate by 5 percentage points, by industry studied. The auto-service chain — repeat, scheduled, trust-dependent work — is the closest analogue to a trade business. Source: Reichheld & Sasser, “Zero Defections: Quality Comes to Services”, Harvard Business Review (1990)

Note what the study measured: not customer satisfaction, not loyalty scores, but defection rate — the share of customers who do not come back. That is a number a two-person crew can reason about. Of the households you worked for two years ago, how many have called you since?

The mechanism is not mysterious. A repeat customer costs nothing to acquire, needs no convincing that you are competent, argues less about price, and refers others. The profit on their second job is structurally higher than the profit on a stranger's first one, because the acquisition cost has already been paid.

Why referrals beat every paid channel

Nielsen's Trust in Advertising study surveyed 40,000 people across 56 countries and asked which forms of marketing they trusted. Recommendations from people they knew came first, at 88% — ahead of every paid format measured.

88%People you know

Share of consumers who say they trust recommendations from people they know — the highest-trust channel in the study, ahead of every paid advertising format measured. Source: Nielsen Trust in Advertising (2021), 40,000 respondents across 56 countries

For trades this matters more than for most industries, because the purchase is high-trust and low-frequency. A homeowner letting someone into their house to open up a wall has no way to assess competence in advance. A neighbour's recommendation resolves that in one sentence, which is why referred jobs close faster and get shopped around less.

Referrals are also the output of retention, not a separate activity. People refer contractors they have used more than once, because a single good job is luck and two is a pattern.

A follow-up rhythm that is not annoying

The mistake most trade businesses make is following up on a marketing calendar — a monthly newsletter nobody opens. The alternative is to tie contact to the service life of the work you did. You already know roughly when what you installed will need attention.

When	Contact	Why it works
At completion	What was done, what to watch for, how to reach you	Arrives while goodwill is highest; makes the referral easy to pass on
First seasonal change	One line: has it held up?	Catches defects while they are small and still yours to fix cheaply
Year one	Adjacent work you noticed but did not quote	You saw the house. Nobody else knows it needs the other thing
Approaching end of life	A reminder the work is due again	Lands when the need is real rather than when the calendar says so

The last row is the one that compounds. Exterior paint runs roughly 7 to 10 years, a water heater 8 to 12, an asphalt shingle roof 20 to 25. If you know when you did the work, you know approximately when it needs doing again — and you are the only contractor in the market who does.

Keep the record, not just the invoice

All of this depends on one unglamorous habit: writing down what you did, at which address, when. Not the invoice — the invoice records what you charged, not what the house needs next. A single line per job (address, work, date, what you noticed but did not quote) turns a customer list into a forecast.

This is the same logic Fadescope applies to properties you have never worked on: property age and last-sale date predict what a house needs, whether or not you have been inside it. Where the work is covers what the national housing data says about that. And when a past customer does refer someone, how fast you respond decides whether the referral turns into a job.