The question most field service business owners ask is whether they should spend more on marketing. The more useful question is: how much revenue do I need to generate, what does it take to generate that, and does what I’m currently spending make sense for that goal?
Most businesses that struggle with marketing aren’t spending too little. They’re spending without a framework. Money goes into Google Ads, or a website refresh, or a directory listing, and nobody knows whether it’s working or what it cost per job booked. The budget gets set by what feels comfortable, not by what the revenue goal actually requires.
That’s what this guide is about: how to size a marketing budget properly, why the percentage-of-revenue benchmarks only make sense in context, and how to use your own job data to arrive at a number grounded in your actual economics rather than a rule of thumb.
Table of Contents:
- Why the 5–10% rule is not enough on its own
- Start with the revenue goal, not the budget
- How the percentage shifts by growth stage
- Where to put the money: acquisition versus retention
- The cheapest leads in your business
- Allocating the acquisition budget across channels
- Tracking what is working
- A practical starting point
- FAQs
Why the 5–10% rule is not enough on its own
You’ve probably heard it: spend 5–10% of revenue on marketing. The SME Marketing Report 2025 points to this range for small businesses. Gartner’s 2025 CMO Spend Survey, covering over 400 marketing leaders across North America and Europe, found average marketing budgets sitting at 7.7% of company revenue. The Hook Agency’s 2026 HVAC marketing budget analysis puts the starting point for a trades business in growth mode at 6–8%.
These benchmarks are a useful sanity check. They’re not a useful starting point for planning.
The right percentage depends on where you are and where you’re trying to go. A £1.5m field service business trying to grow to £2.5m in two years needs to invest proportionally more than one content to stay at £1.5m. A business entering a new service area needs more than one with an established local reputation. A business with strong retention and a dense service agreement base can spend less on acquisition than one running on reactive callout work.
The Whitehat SEO 2026 marketing budget analysis notes that businesses under £10m in revenue typically need to spend 16–18% to compete effectively. That figure is higher than the commonly cited benchmark because smaller businesses have to build awareness against established players without the benefit of an existing reputation doing part of the work.
The percentage is a check. The calculation comes first.
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Start with the revenue goal, not the budget
Reverse-engineer the budget from your revenue goal. Once you know what you want to generate, you can work backwards to figure out what the budget needs to be.
You need four numbers from your own business. Without them, any figure you land on is a guess.
Average job value. What does the average completed job invoice? Not your highest-margin job type or your most aspirational quote. The mean across all completed work in the past twelve months. The job costing article and the true hourly rate guide both cover how to calculate this accurately, accounting for materials, labour, and overhead.
Lead-to-job conversion rate. Of the enquiries that come in, what proportion turn into completed paid work? That’s your booking rate. If you receive 100 enquiries per month and book 40 of them, your conversion rate is 40%. Most field service businesses don’t track this formally, which means they can’t do the reverse-engineering calculation and end up spending on lead generation without knowing whether the funnel is working.
Average customer lifetime value. How many times does the average customer use you over five years, and what’s the total value of that relationship? A customer who books a boiler service once is worth their single job value. A customer who takes out an annual service agreement and calls you for three reactive repairs over five years is worth six or eight times that. Both have the same acquisition cost. Their return on that investment is completely different.
Target revenue gap. How much additional revenue do you want to generate? If you do £800k and want to reach £1.1m, the gap is £300k.
With those four numbers, the maths is simple:
Revenue gap ÷ average job value = additional jobs needed Additional jobs needed ÷ conversion rate = leads required Leads required × cost per lead = budget needed
Here’s what that looks like in practice. A £300k revenue gap at a £2,500 average job value means 120 additional jobs. At a 40% conversion rate, you need 300 leads. If your cost per lead from paid search runs at £70–£90 (a reasonable UK estimate based on the range reported by LocaliQ’s 2025 home services benchmarks), the budget required for those leads alone is between £21,000 and £27,000. As a percentage of the £300k gap, that’s 7–9%. As a percentage of your total £1.1m target revenue, it’s under 3%.
Neither figure is particularly frightening. But you only get there by doing the calculation, not by applying a blanket percentage to your current turnover.
How the percentage shifts by growth stage
The benchmarks make more sense once you understand what drives the variation.
Maintenance mode (0–3%). If you’ve got strong word-of-mouth, a dense service agreement base, and more work than you can comfortably take on, you don’t need to spend heavily on new customer acquisition. The money you do spend goes mostly into retention: service reminders, customer newsletters, email follow-up, keeping existing relationships warm. It’s the cheapest marketing there is, because the audience already knows and trusts you.
Stable growth (5–8%). The range most benchmarks point to. The business is growing steadily, replacing churned customers, winning some new accounts. Spending sits across a mix of acquisition channels (local search, Google, directories) and retention activity, with a focus on reliable, repeatable lead generation rather than aggressive market share capture.
Active growth (8–12% or more). You’re actively trying to grow headcount, expand into new service areas, or build a commercial client base alongside domestic work. Higher spend is required because brand awareness in new segments takes time and money to build. The return is lagged: spend today, see jobs in three to six months as organic channels compound and new commercial relationships develop.
Start-up or market entry (up to 15–20%). Building from scratch, or entering a new geography where you have no existing reputation. The Whitehat SEO benchmarks suggesting 16–18% for sub-£10m businesses reflect this reality. A new business has no existing customers doing free word-of-mouth marketing on its behalf. Everything has to be paid for until the reputation builds.
The mistake most field service businesses make is applying maintenance-mode spending (or less) while trying to achieve active-growth-mode results. Money goes in, the phone doesn’t ring enough, and the conclusion is that marketing doesn’t work. What actually happened is that the budget was sized for a different goal.
Where to put the money: acquisition versus retention
Once you have a budget figure, channel allocation matters as much as the total. The most important split to get right is between acquisition (finding new customers) and retention (keeping the ones you have).
Most field service businesses spend disproportionately on acquisition and neglect retention entirely. That’s a costly mistake, and the numbers make it hard to argue with.
Acquiring a new customer costs five to twenty-five times more than retaining an existing one. You have a 60–70% chance of selling to an existing customer; with a new prospect it’s 5–20%. Existing customers generate roughly 65% of the average business’s revenue. And a 5% improvement in customer retention can increase profits by 25–95%, according to data cited across DemandSage, Bain & Company, and multiple retention research sources.
For a field service business, the retention investment isn’t expensive. It’s mostly systems and time: a CRM that tracks every customer’s last contact and service date, automated reminders before annual services are due, a consistent follow-up process after every job, and service agreements that turn reactive customers into recurring revenue. None of this requires heavy ad spend. It requires organisation.
The acquisition budget (Google, paid search, directories) should be sized to cover the lead gap after you’ve maximised what retention and referrals naturally deliver. Many field service businesses that invest properly in retention find their paid acquisition requirement drops considerably, because retained customers refer more, take out more service agreements, and call back for additional work that previously went to other contractors.
The cheapest leads in your business
Before you spend anything on acquisition, take stock of where your most cost-effective leads already come from.
Existing service agreement customers don’t require acquisition spend. You paid to win them once. The ongoing cost of serving and retaining them is a fraction of what you’d pay to replace them. Every business that moves customers from reactive to recurring revenue on a service agreement effectively removes those customers from the acquisition budget permanently. The service agreements guide covers how to build and price this recurring revenue base.
Referrals from satisfied customers arrive at zero paid cost. McKinsey research puts word-of-mouth as a driver of 20–50% of purchasing decisions. In field service, where most buyers are choosing a tradesperson based on trust rather than price, referred customers convert at far higher rates than cold paid leads and tend to have higher lifetime values. Investing in service quality, follow-up, and review collection is a form of marketing spend that compounds without the ongoing cost structure of paid channels.
Upsells and cross-sells within existing jobs are the highest-margin revenue in any field service business. When an engineer identifies an additional need on site and has the conversation professionally, the job value increases with zero additional acquisition cost. The revenue diversification guide covers how to structure this systematically. Tracking which job types generate the most upsell opportunities is part of what the reports and dashboards in a job management platform can reveal.
Only after you’ve got a clear picture of what these zero- or low-cost sources are delivering should you size the paid acquisition budget around the remaining gap.
Allocating the acquisition budget across channels
For a field service business spending on acquisition, the channel allocation matters. The how to get more HVAC clients guide covers the specific channels in depth, so this section focuses on the budget logic.
Local search (Google Business Profile, local SEO) is the highest-return channel for most field service businesses over a twelve to twenty-four month horizon. It is slow to build but once established, it generates leads at a fraction of paid channel costs. Emulent Agency’s 2026 cost-per-lead analysis found organic search channels deliver leads roughly 61% cheaper than paid channels, with leads converting at around twice the rate. Investing consistently in reviews, a well-maintained Google Business Profile, and local content is the most capital-efficient acquisition strategy for a business with the patience to wait for compounding results.
Google Local Services Ads (LSAs) sit above standard search results and charge by lead rather than by click, with Google pre-screening enquiries. They are among the most immediate sources of high-intent leads for trades businesses. Blue Grid Media’s 2026 LSA analysis puts UK-equivalent CPL for HVAC at £60–£100 and electricians at £30–£70. These figures are starting points; actual CPL varies by location, competition density, and review volume. A business with strong reviews and an optimised profile consistently beats these averages.
Google Search Ads (PPC) deliver immediate volume but at higher cost. The SearchLight data from January 2026, tracking $14.9m in ad spend across 816 HVAC and plumbing contractors, puts non-branded CPL at around $149 (roughly £120) and branded CPL at $34 (roughly £27). Paid search is best used as a supplement to organic channels, not a replacement: it stops the moment you stop paying, while SEO and reputation compound over time.
Directory listings (Checkatrade, Rated People, TrustATrader) are a reasonable starting point for businesses building local visibility, but they share your leads with competitors and can become expensive relative to what they return. They work best when combined with a strong review profile, and poorly when used as the primary or only channel.
A sensible starting allocation for a field service business in active growth mode, once the retention and referral base is properly set up:
- 40–50% on local search dominance (organic SEO, GBP, review strategy)
- 30–40% on paid lead generation (LSAs, Google Ads)
- 15–20% on brand and community (van visibility, local presence, referral program)
- 5–10% on retention activity (email, service reminders, customer communications)
The mix shifts as the business matures. Early-stage businesses weight toward paid because organic takes time to build. Established businesses shift toward organic and retention as those channels compound.
Tracking what is working
A marketing budget without tracking is a guess you repeat monthly. The only way to know whether the budget is sized correctly is to measure the output.
The minimum useful data set is three numbers per channel: spend, leads generated, and jobs booked from those leads. Once you’ve got those, you can calculate cost per lead and cost per job booked, and compare them across channels to see where money is generating work and where it isn’t.
Here’s the problem most field service businesses run into: lead source isn’t tracked at the job level because the job management software isn’t set up to capture it. A CRM that records where each enquiry came from (referral, Google, directory, existing customer) and connects that source through to the completed job gives you the data to make real budget decisions. Fieldmotion’s CRM module tracks customer history and job source, and the reports and dashboards let you pull this data across any time period or channel.
The 10 metrics guide covers the broader operational metrics that sit alongside the marketing numbers. What matters for budget decisions specifically is connecting spend to revenue: not just “did we get leads” but “did those leads turn into jobs, and did those jobs deliver the margin the business needed?”
A practical starting point
If you’ve never set a marketing budget properly, or you’ve been working from instinct rather than calculation, start here.
Pull the last twelve months of completed jobs and calculate your average job value. Pull your enquiry log and estimate your conversion rate from enquiry to booked job. Estimate how many of your existing customers you have contact details for versus how many are effectively lost after the first job.
With those numbers, run the reverse-engineering calculation: what additional revenue do you need, how many jobs does that require, how many leads, and what does your current conversion rate suggest the budget should be?
If the number is higher than you’re currently spending, you’ve got two options. Increase the budget to match the goal, or adjust the goal to match the budget. Both are honest answers. The one to avoid is continuing to spend below what the goal requires and then concluding that marketing doesn’t work.
The sales margin calculator helps work through whether your margin on each job type is sufficient to support the marketing investment the job requires. If a job type delivers thin margins and needs expensive paid leads to generate, the maths won’t work regardless of how you price your campaign.
Marketing in field service isn’t separate from operations. The businesses that get the best return from their marketing spend are the ones that close jobs quickly, invoice on completion, follow up systematically, and keep enough records to know where each job came from. The budget is only one variable. How efficiently you convert and retain is the other.
If you want to see how Fieldmotion helps field service businesses track lead sources, job values, and customer lifetime value in one place, book a free demo.
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Related reading:
- How to get more HVAC clients without wasting money on bad leads — the specific channels and tactics in detail
- Service agreements in field service — building the recurring revenue base that reduces acquisition spend
- 10 metrics every growing field service business should track — the operational numbers that underpin marketing performance
- Sales margin calculator — checking whether each job type can support its marketing cost
- How to calculate your true hourly rate — the cost side of the marketing ROI calculation
- How to diversify your field service revenue — upsells and cross-sells as zero-acquisition-cost revenue
- How field service businesses can protect their online reputation — reviews as a marketing asset and acquisition driver
FAQs
What percentage of revenue should a field service business spend on marketing?
The commonly cited benchmark is 5–10% of revenue, and for most field service businesses in stable growth mode, 5–8% is a reasonable starting point. That said, the right figure depends on your growth ambitions. A business trying to grow aggressively, enter a new service area, or build a commercial client base from scratch may need to spend 10–15% or more until awareness builds and organic channels compound. A business with strong word-of-mouth and a dense service agreement base can often sustain steady growth on less. The percentage is only meaningful in the context of a specific revenue goal — which is why reverse-engineering the budget from your target is more reliable than applying a blanket rule.
How do I work out how much I need to spend to hit my revenue goal?
Start with four numbers: your target revenue gap (how much additional revenue you want), your average job value, your lead-to-booking conversion rate, and your cost per lead from the channels you use. Divide the revenue gap by average job value to get the number of additional jobs you need. Divide that by your conversion rate to get the leads required. Multiply leads by cost per lead to get your budget. For example, a £300k revenue gap at a £2,500 average job value and a 40% booking rate requires 300 leads. At £70–£90 per lead from paid search, that’s a budget of £21,000–£27,000 — roughly 7–9% of the gap you’re trying to close.
Should I spend my marketing budget on new customers or existing ones?
Both, but most field service businesses underinvest in retention relative to acquisition. Acquiring a new customer costs five to twenty-five times more than retaining an existing one, and you’re far more likely to win repeat work from a customer who already knows you (60–70% probability) than to convert a cold prospect (5–20%). The most capital-efficient approach is to maximise what service agreements, referrals, and follow-up can deliver before sizing the paid acquisition budget around the remaining gap. Retention investment for a field service business is mostly systems and time — a CRM, service reminders, and a consistent follow-up process — rather than heavy ad spend.
What does a lead actually cost for a trades or HVAC business?
It varies significantly by channel and by trade. Google Local Services Ads (LSAs) in the UK typically run at £40–£100 per lead for HVAC and heating work, £30–£70 for electricians, and £35–£75 for plumbing, based on 2026 benchmark data. Non-branded Google Search Ads run higher — typically £100–£130 per lead in the trades. Organic search through local SEO delivers leads at a fraction of paid channel costs once established, but takes three to six months to build. Referrals from existing customers are effectively free. Your blended cost per lead across all channels combined is the figure that matters for budget planning, not the cost on any single channel in isolation.
How do I know if my marketing budget is working?
Track three numbers per channel: spend, leads generated, and jobs booked from those leads. From there you can calculate cost per lead and cost per booked job, and compare performance across channels. The key is connecting lead source through to the completed job in your CRM or job management system — not just counting leads as they come in. If you can’t trace a marketing pound through to a booked job, you’re flying blind on whether the spend is working. Review channel performance monthly for high-cost paid channels like Google Ads, and quarterly for slower-moving channels like SEO and referrals.
What is the cheapest way to generate leads for a field service business?
The cheapest leads come from sources that don’t require ongoing ad spend. Referrals from satisfied customers arrive at zero paid cost and tend to convert at higher rates than cold leads. Existing customers on service agreements don’t need to be acquired again — you’ve already paid to win them. Upsells identified during existing jobs generate revenue with no acquisition cost at all. After those, organic local search (Google Business Profile, local SEO, review building) delivers leads significantly cheaper than paid channels once it’s established, though it takes time to build. Paid channels like Google Ads and LSAs are valuable for immediate volume but should supplement these lower-cost sources rather than replace them.
