Heat pump installer income guide 2026: what MCS-certified businesses actually earn

If you're considering getting MCS-certified for heat pumps, or you're already certified and trying to work out whether your numbers stack up, the honest information is hard to find. Most articles either talk about the market in general terms or focus purely on what a single engineer earns. This is about the business: what a properly run heat pump installation company can turn over and take home.

What MCS certification is worth

MCS certification unlocks two things: the right to install heat pumps under the Boiler Upgrade Scheme (BUS), and customer trust. Of those two, the BUS access is the financially material one.

The BUS grant is £7,500 for air source heat pumps and £7,500 for ground source. It's paid to the installer, not the customer, and it's off the top of the job value. A £12,000 ASHP install with BUS applied means the customer pays £4,500 and the BUS pays you £7,500. You invoice the full amount; the grant comes separately.

Without MCS, you can't access BUS. You're also not credible to the homeowners who've done their research - and most heat pump buyers have. Uncertified installers do exist in the market, but they're competing on price against certified ones with a grant to offer. It's not a sustainable position.

The certification itself costs roughly £2,000-£4,000 through an MCS-approved certification body (NAPIT, NICEIC, and Stroma are the main ones), plus around £500/year in renewal fees. Add in the time cost of getting your processes and documentation up to standard - typically 3-6 months before you're actually issuing MCS certificates on jobs. For most businesses, the payback on that investment is fast once volume picks up.

Day rates and employment numbers

A qualified heat pump engineer in the UK (MCS-competent, Level 3 plumbing or NVQ background, heat pump specific training) earns £350-£450/day employed, or £500-£650/day as a self-employed subcontractor.

Those numbers have moved up over the past two years as demand has outpaced supply. The Heat Pump Association estimated around 14,000 certified heat pump installers in the UK at the start of 2026, against a Government target of 600,000 installs per year eventually requiring considerably more. The supply of qualified engineers is the constraint, not the work.

For a business owner who's also a working engineer, the income conversation is more nuanced - you're not just earning a day rate, you're building an asset and carrying the risk. That's covered in the turnover section below.

What a 5-person team can realistically earn

A typical small heat pump business running at scale looks like this:

Two engineers on site (plus apprentice support) can complete one ASHP install in 2-3 days depending on complexity. That's roughly 6-8 jobs per engineer pair per month, or 10-15 jobs for the full team with the director taking some installs and some office/sales time.

At 15 ASHP installs per month on a £12,000 average contract value:

Overheads for a business at this size - vans, insurance, office admin, software, lead generation, accountancy - typically run £120-160k per year. That leaves a net profit of £370-400k before director salaries and tax.

Two working directors drawing £50k PAYE each leaves £270-300k to distribute as dividends or retain in the business. After income tax and dividends tax at that level, each director takes home roughly £90-120k.

What pushes income up or down

The numbers above assume a tightly run operation. The gap between 20% gross margin and 10% gross margin on the same revenue is about £220,000 a year. The main drivers:

Volume is the biggest lever. Going from 15 to 20 installs/month with the same fixed overhead base adds around £165k revenue with most of it dropping to the bottom line.

Average job value matters more than it looks. Mixing in some GSHP installs (£18,000-25,000 contract value) or pairing heat pumps with battery storage or hot water heat pumps lifts the average meaningfully. A business running at £15,000 average vs £12,000 average is 25% better off on the same install count.

Survey accuracy hits margin directly. If your heat loss calculations are off and you're revisiting or upgrading equipment post-install, you're eating that cost. Getting the survey methodology right - and documenting it consistently - is where the margin is protected.

Retentions and snagging are the hidden cost in a growing business. One job with a complicated snagging dispute can absorb 10-15 hours of engineer time. Process and documentation reduce the incidence; having commissioning records and handover sign-offs protect you when they happen anyway.

The business model question

Employed engineers or subcontractors is a decision that hits income and scalability differently. Employed staff cost more in base terms (salary, employer NI, pensions, holiday pay) but you control the schedule and the training. Subbies give you flexibility but they're harder to build a consistent quality system around, and in a tight labour market they'll work for whoever pays most.

Most growing heat pump businesses move from subcontractors toward employees around the 8-12 installs/month mark, when the scheduling predictability is worth the overhead.

The businesses that scale past £3m turnover are generally ones that have solved two things: a repeatable survey and quoting process that doesn't fall apart when the director isn't doing it personally, and an MCS compliance process that doesn't create a backlog after every busy month. Both of those are process problems before they're tech problems - but once the process exists, software to run it at scale makes a real difference.

If you're looking at how other heat pump businesses manage MCS compliance and quoting at volume, book a demo with Payaca and we can show you what that looks like in practice.