Build Recurring Revenue: Maintenance, Service, and Subscriptions

Why recurring revenue makes a business more stable

Many trade, engineering, and manufacturing businesses live on project work. A job comes in, is done, invoiced, and then the search for the next one begins. That works as long as demand is high. In quieter phases the drawback shows: every month starts from zero, and utilization depends on the sales of recent weeks.

Recurring revenue changes this. It comes from services that are contractually agreed and repeat at fixed intervals. That raises one question: how does a traditional business build recurring revenue without losing margin? To answer it, we first clarify the terms and the mental model of servitization, then the findings on the so-called service paradox, and finally set out stages of expansion, a costing, and a procedure for the first contracts.

A maintenance contract does not sell hours but the certainty that someone will come.

Terms: recurring revenue, service contract, installed base

Recurring revenue is revenue based on an ongoing agreement that arises again without a new sale. It does not include revenue from regular customers who order regularly but decide anew each time. That revenue is valuable but not contractually secured. How to grow it is described in the guide growing existing customers.

A service contract governs a recurring service at a fixed amount per period, such as annual maintenance, a mandatory inspection, standby with a guaranteed response time, or the support of a system. The installed base is the total of all systems, machines, or equipment that a business has installed or sold at customers. For most businesses it is the obvious starting point for service contracts.

The mental model: servitization and the service paradox

Research calls the shift from pure product or project business to an offering of product and service servitization. Ulaga and Reinartz (2011) speak of hybrid offerings, combinations of goods and services that benefit the customer more than either separately. They refer to a study by Fang, Palmatier, and Steenkamp (2008) according to which the expansion of services only showed clearly in firm value once service revenue reached a critical mass of on average about 20 to 30 percent of total revenue.

Gebauer, Fleisch, and Friedli (2005) describe the downside from their work with more than 30 equipment manufacturers. They often observed a service paradox: the companies invested substantially in expanding their service business, offered more services, and had higher costs, without achieving the expected higher returns. In the same vein, Ulaga and Reinartz (2011) cite a consulting study according to which only 21 percent of companies succeeded with their service strategies.

Both findings come from larger manufacturers, and some of the figures are second-hand. But they show a tension every owner should know: recurring services can make a business more stable and more valuable. They can also become a business that ties up staff and earns hardly anything.

What successful businesses do differently

Ulaga and Reinartz (2011) used case studies and in-depth interviews with manufacturing executives to examine what makes hybrid offerings successful. They found four resources that give manufacturers an advantage over pure service providers: data on the use and condition of the installed base, their own development and production, an experienced sales force with a distribution network, and their own field service organization. Successful companies built capabilities from these, such as analyzing service data, assessing and limiting the risk of a contract, designing products for serviceability from the outset, and selling hybrid offerings.

Three principles can be derived from this for a small business. First: build service contracts where you already have knowledge, that is, for equipment you installed yourself or know well. Second: cost the risk before you commit to a fixed price. Third: do not sell the contract on the side but as a service in its own right with a clear benefit. A recent meta-analysis by Bustinza, Rabetino, and Vendrell-Herrero (2026) of 51 journal articles supports a further point: contractually agreed services went along with better results there than services based on data alone.

Four stages of recurring services

Recurring revenue rarely arises in one go. A step-by-step build-up has proven itself, with each stage taking on more responsibility and therefore requiring more experience. The four stages are the tool of this guide.

1. Stage 1: Appointment reminders

   You actively remind customers of due maintenance and inspections and bill by effort. Not yet a contract, but a fixed reason for contact and a data basis on call-outs.

2. Stage 2: Maintenance contract

   Fixed dates each year at a flat price, materials and breakdowns billed by effort. The risk stays manageable because the scope is easy to plan.

3. Stage 3: Service contract with response time

   In addition, a committed response time for breakdowns and a quota of call-outs. Now you carry standby and volume risk and need data from stages 1 and 2.

4. Stage 4: Availability contract

   You commit to availability or function, not just call-outs. This stage requires precise knowledge of the equipment and robust costing and makes sense only for few businesses.

Most small businesses already reach a noticeable share of recurring revenue with stages 2 and 3. The jump to stage 4 is a different business, because the business then owes the result. Which pricing model fits which stage is analyzed in the comparison pricing models compared.

How to cost a maintenance contract

The service paradox usually starts in the costing. The contract is estimated based on how long maintenance normally takes, not on what actually occurs over a year. A complete costing therefore contains six components.

The reserve for breakdowns is the item most often missing. It can only be determined from experience. That is why the data from stage 1 is so valuable: if you know how often a system fails per year, you can cost the contract safely. If you do not know, you should initially bill breakdowns by effort. We understand contribution margin here as in the other articles: revenue minus the costs incurred directly by the job.

How to win the first contracts

The best moment for a service contract is the completion of a project. The customer has just experienced how your business works, and the equipment is new. If you offer the contract only years later, you compete with all other providers. How to use the first weeks after a job is described in the guide customer onboarding.

• The installed base is recorded in a list with system, year of construction, and last call-out.
• Every completed project comes with a contract offer.
• There are two to three clearly described contract tiers with prices.
• Dates from contracts are scheduled a year in advance.
• Every contract is post-costed annually.

Recurring revenue also increases a customer’s value over the entire relationship. How to calculate this value is shown in the guide calculating customer value.

Transfer and limits

Two views are possible. The first sees recurring revenue mainly as security: predictable utilization, better liquidity, higher value of the business in a sale. The second warns that service contracts tie up capacity that would earn more in project work and that fixed prices shift risks onto the business. I consider both justified. It does not follow that you should do without contracts, but that you should offer them only where the business knows the equipment and tracks costs.

Predictable income also helps liquidity, especially when contracts are invoiced annually in advance. Why growing businesses in particular depend on this is analyzed in the article growth costs cash. And offering services as fixed packages with a fixed process creates the basis for what the guide scaling or just growing describes: revenue that grows faster than effort. The limits of this guide lie in the sources: the studies cited mainly concern larger manufacturers; there are hardly any robust figures for small businesses.

Conclusion and next step

How does a traditional business build recurring revenue without losing margin? By starting with its own installed base, proceeding in stages, costing every contract with a reserve for breakdowns, and recalculating annually. The service paradox is not a law of nature. It is usually the consequence of contracts sold without data and without post-costing.

1. This week: Create a list of your installed base with system, year of construction, and last call-out.
2. Next week: Cost a maintenance contract for the most common type of system with all six components.
3. In a month: Offer the contract on the next ten completed projects and evaluate acceptance.

Recurring revenue does not come from one big move but from many small contracts that come back every year.