ISA Consortium

Two contractors came to us in 2023, mid-way through merger conversations.

Firm A: £6M turnover, 9% net margin, strong main contractor relationships, weaker on direct-to-end-client work.

Firm B: £4M turnover, 12% net margin, strong on direct end-client work, weaker on bigger projects.

On paper, the merger logic was obvious: combine them and you've got a £10M business with both capabilities, stronger bid lists, shared overhead.

We modelled it. The financial picture wasn't what either side expected.

What the combined entity looked like at 12 months post-merger (in the modelled scenario):
• £9.7M combined turnover (some leakage during transition)
• Net margin compressed to 8.6% (overhead reorganisation, dual systems, customer churn)
• Combined enterprise value: roughly £4.3M
• Integration cost: £280K not previously accounted for

What the two firms looked like at 12 months without merger but with deeper formal collaboration:
• Firm A: £6.6M turnover, 10% margin, EV roughly £3.1M
• Firm B: £4.4M turnover, 13% margin, EV roughly £2.4M
• Combined value: £5.5M
• Plus retained option to merge later from a stronger position

The merger arithmetic looked good. The actual numbers said the opposite.

What they did instead:
✅ Formal partnership agreement (not a merger)
✅ Specific JV vehicle for bigger projects they could jointly target
✅ Shared bid support, but separate balance sheets
✅ Regular strategic reviews, but no equity entanglement

18 months in:
• Both firms had grown
• Both had higher margins than before the conversation started
• Combined value materially higher than the original merger scenario
• Both retain the option to merge later if it makes sense

The owners' reflection: 'We thought the answer was being one bigger company. The answer was being two stronger ones, working together properly.'

Merging often looks like the right answer when partnership would be better. The financial model usually tells you which is which, if anyone runs it before the deal.

Joint ventures kill more construction relationships than they create.

Most construction owners considering a JV underestimate how often these things go wrong.

Done well, a JV unlocks projects that change a business. Done badly, it destroys relationships, cash, and reputation in the same year.

The pattern that works:
✅ Two firms with genuinely complementary capabilities (not similar ones)
✅ One specific project or programme, not a vague 'work together'
✅ A written JV agreement before any commercial activity, not after
✅ Clear split of profit, cost, risk, liability, decision-making
✅ A defined exit mechanism if it doesn't work out
✅ Separate JV vehicle or contractually clean structure that isolates risk

The pattern that fails:
❌ Two firms with similar capabilities competing for the same margin
❌ 'We'll work out the details as we go'
❌ Verbal agreements that no one wrote down
❌ One partner doing most of the work, the other doing most of the talking
❌ No mechanism to deal with disputes when they happen
❌ Mixed liabilities that contaminate the parent businesses

The financial questions that matter most before signing:
1. Who provides working capital, and on what terms?
2. How is profit calculated and shared (gross or net, before or after central overhead)?
3. Who carries which risks (delay, dispute, defect, retention)?
4. What happens if one partner runs into financial trouble unrelated to the JV?
5. Who has legal authority to bind the JV with external parties?

If you can't answer these clearly, you're not ready to sign.

Reminder: every JV is specific to its circumstances. Get proper legal and commercial advice on the actual deal in front of you.

Send us a message for the JV readiness framework we use with clients.

Which door are you closest to right now?

Honest question for the construction owners reading 👇

Yesterday I wrote about the three doors most firms face between £8M and £12M. Stay independent, partner up, or merge or acquire.

Which door are you closest to today?

🅰️ Independent. Happy with the current scale.
🅱️ Independent, but actively thinking about partnership for a specific opportunity
🅲️ Exploring a JV or formal partnership now
🅳️ Considering merger or acquisition (either direction)

No right answer. But the decisions, structures and financial models are very different for each.

And one of the biggest mistakes we see is owners who are at C or D in their head but trying to manage it like A.

A, B, C or D in the comments.

Most growing construction firms hit a ceiling around £8M to £12M. Then face three doors.

Build a construction business from £750K to £8M and you've already done something most firms never do.

But somewhere between £8M and £12M, most owners hit a ceiling. The next stage of growth needs something fundamentally different from what got you here.

There are usually three doors at that point.

Door 1: Stay where you are
Hold the size. Tighten the operation. Maximise profitability at current scale. Honest answer for many owners. Often the best one.

Door 2: Joint venture or partnership
Team up with another firm to win work neither of you could win alone. Bigger projects, shared risk, shared margin. Faster than building it yourself, more contained than merging.

Door 3: Merge, acquire, or be acquired
Combine balance sheets, capabilities, and management teams permanently. The fastest route to step-change in size, but also the highest-risk and highest-reward.

Most owners drift through this decision rather than make it deliberately. They take on bigger work without the right partner. They acquire when they should have stayed independent. They stay small when a partnership would have transformed the business.

The decision deserves real thought because:
✅ Each path has different financial implications across 5 to 10 years
✅ Each requires different skills and structures to do well
✅ Each carries different risks if it goes wrong
✅ The reversibility of each is very different

Worth flagging: this is a strategic framework, not personal advice. Any specific partnership, merger or acquisition needs proper legal, tax and commercial due diligence.

Message us THREEDOORS for the strategic options framework we use with clients.

Most AI conversations in construction right now are either hype or fear. Both miss the point.

Here's where AI is genuinely useful for £750K to £15M construction firms today.

Where it works well now:

✅ Reading paper documents: scanned invoices, delivery notes, paper contracts. Modern tools extract data with high accuracy and post directly to accounts.

✅ First-draft writing: quote covering letters, terms and conditions, supplier communications. The owner edits, doesn't write from scratch.

✅ Reconciliation and matching: identifying which transactions match invoices, flagging anomalies. Reduces month-end time materially.

✅ Email and inbox triage: drafting replies, sorting supplier emails, surfacing what actually needs your attention.

✅ Analysis on demand: 'show me my top 10 most profitable jobs from last year' answered in seconds, not days.

Where it's not ready yet:

❌ Pricing decisions on complex tenders. The maths matters too much to delegate.

❌ Anything that requires understanding your specific client relationships. Context still wins.

❌ Final review of management accounts, contracts, or legal documents. Always a human last.

❌ Replacing your bookkeeper or finance manager. Augmenting them, yes. Replacing them, no.

The construction firms getting real value from AI right now aren't using it as a magic solution. They're using it to remove the repetitive parts of the work, so their people can focus on the parts that actually need human thinking.

If you're not yet using AI tools in any part of your back office, you're 12 to 24 months behind. Not catastrophic. But the gap widens every quarter.

Comment AI below for the practical AI-in-construction-finance starter guide we share with clients.

A £5M Hertfordshire contractor came to us early 2024. Their finance setup was the classic 'B' from yesterday's poll.

Xero set up properly. Bank feed connected. Monthly accounts coming through. On paper, it looked fine.

In reality:
• 2 part-time bookkeepers + 1 office manager doing 38 hours of finance admin a week between them
• Job costing in a master spreadsheet built in 2018
• Margin per job visible only at year-end, when the accountant reconciled
• Director making pricing decisions on a 'feel' for margin, not data

Over 4 months, we put in place:
✅ Dext for purchase invoice capture
✅ A construction-specific job costing layer integrated with Xero
✅ A monthly Fathom dashboard with live KPIs
✅ Reworked the bookkeeping workflow to eliminate duplicate data entry

What changed in 9 months:

Admin time:
• From 38 hours a week to 6 hours a week
• Net saving: 32 hours a week, freed up for proper financial analysis
• One bookkeeper redeployed to credit control, debtor days dropped 14 days

Margin:
• Live job costing revealed 4 specific job types that were consistently losing 6 to 9% margin no one could see
• Pricing on those job types was adjusted
• Annualised margin uplift: £190K on the same turnover

Total annual cost of the new stack: £6.4K
Total annual return: £190K margin + the value of 1,664 hours of staff time

The director's reflection: 'We weren't losing money. We were losing visibility. The two feel the same in the end.'

Modernising the back office isn't a tech project. It's a margin project that happens to involve tech.

4 pieces of back-office tech that pay for themselves in under a year.

We're not in the tech recommendation business. But after 50+ implementations across construction firms, four categories of tool consistently pay for themselves in under 12 months.

Not the only ones worth having. Just the ones with the most obvious return.

1. Receipt and invoice capture (Dext, Autoentry, Hubdoc)
Cost: roughly £30 to £100 a month.
Replaces: someone manually keying purchase invoices into the accounts system.
Time saved: 4 to 8 hours a week, every week.
Side benefit: VAT becomes audit-ready as it happens, not a quarter-end scramble.

2. Construction-specific job costing (e.g. Eque2, Re-flow, Buildxact, integrated with Xero/QB)
Cost: £100 to £400 a month depending on size.
Replaces: the master spreadsheet that 'only Sarah understands'.
Real benefit: live job margin visibility. You see margin slipping in week 3 of a 12-week job, not at month 4 of the post-mortem.

3. Payment and bank automation (open banking feeds, Plaid, GoCardless)
Cost: usually under £50 a month or included in the accounts software.
Replaces: manual bank reconciliation, supplier payments by remembering, debtor chasing by gut feel.
Real benefit: cash visibility becomes daily, not weekly. Debtor days drop 5 to 12 days on average.

4. Management reporting layer (Fathom, Spotlight, Float, Syft)
Cost: £50 to £150 a month.
Replaces: hand-built spreadsheets that the accountant sends quarterly.
Real benefit: monthly accounts with real KPIs, cash forecasts, and proper job analysis. Decisions made on data, not memory.

Total monthly cost for a £4M construction firm: roughly £250 to £700.
Typical return: 2 to 4 percentage points of net margin, plus 30 to 60 hours a week of back-office time freed up.

These tools work best as part of a properly designed stack, not bolted on randomly. The firms that get the most out of them sequence the rollout, train the team, and connect them properly.

Send us a message for the construction finance tech roadmap we use with clients.

What's your current finance tech stack?

Honest question for the construction owners reading 👇

What does your finance setup actually look like today?

🅰️ Mostly Excel. Some accounts software for compliance.
🅱️ Xero or QuickBooks, manual entry, spreadsheets on the side
🅲️ Xero or QB plus a few automation tools (Dext, Autoentry, etc)
🅳️ Full integrated stack: accounts, job costing, payroll, automated bank feeds, real-time dashboards

Each one runs the business differently:

A means you're carrying a lot of risk in one or two people's heads, and getting management info is expensive.

B is the most common setup we see. It works, but there's significant time and accuracy waste.

C is where most well-run construction firms sit in 2025.

D is where the firms scaling fastest already are. Real-time visibility, decisions made on current data, 80% less admin time.

A, B, C or D in the comments.

The back office is where margin hides. Most firms can't see it.

Walk into the back office of a typical £750K to £15M construction firm. You'll usually find:

• A copy of Sage or Xero set up in 2015
• Excel spreadsheets that no one fully understands except one person
• PDF invoices that someone manually keys into the system
• Job costing tracked in a separate spreadsheet, reconciled (badly) at month-end
• Management accounts that arrive 6 to 8 weeks late, if at all

None of this is wrong, exactly. It works. It's just running on infrastructure from a different era.

Here's what it costs you:

Time. Most construction firms in this turnover bracket have 30 to 60 hours a week of back-office admin that doesn't need a human doing it.

Visibility. By the time you can see whether a job made money, the next 3 jobs are already in progress with the same problem.

Decisions. Owners make pricing, hiring, and quoting decisions on memory and gut feel because the data isn't real-time. That's expensive.

Margin. The biggest one. The firms with proper back-office systems consistently run 2 to 4 percentage points higher net margin than those without. On a £4M business, that's £80K to £160K a year of pure margin uplift, every year.

The barrier isn't usually money. The tools are affordable now. The barrier is owner attention. Modernising the back office feels like a project, not a priority, until someone calculates what the old setup is actually costing.

Message us BACKOFFICE for the finance tech audit we run with clients.

When main contractor work is actually the right choice

After 4 days arguing for shifting toward end client work, here's the honest other side.

Main contractor work is sometimes the right call. Often, even. The trick is choosing it deliberately rather than drifting into it.

When it actually makes sense:

✅ You're in a specialism where main contractor relationships are the natural route to market.
Highways, rail, large-scale civils, certain M&E specialisms. End client work in these areas is rare. The smart play is to be a great supply chain partner, not to fight the structure.

✅ You're newly trading and need predictable flow.
End client work takes years to build the pipeline for. Main contractor work can be won next week. For a 0 to £2M firm, this is often the right starting structure.

✅ You've built a reputation with specific main contractors that drives repeat work at decent margin.
If you're consistently winning at 9% plus from 3 to 4 main contractor relationships, that's a real business. Don't fix what isn't broken.

✅ Your operational capability is built around large, complex, predictable projects.
Your people, processes and systems may genuinely be better-suited to one big job a year than 20 small ones.

Where it goes wrong is when main contractor work becomes the default by accident, not the choice by design.

The questions worth asking once a year:
✅ Did I choose this client mix, or did it choose me?
✅ What's the actual net margin by client type?
✅ If my top main contractor relationship changed hands tomorrow, what happens?
✅ Am I building a business, or am I a subcontracted department of someone else's?

The last one is the hardest. And the most important.

Comment MIX below for the client portfolio review template we use with clients.