One Client Gives Me Most of My Work: How to Cut the Risk
The short answer
Don't drop the big client. Measure how much of your turnover and profit depends on them, tighten your terms so a bad month can't sink you, then reserve time and team capacity every week for two or three new sources of work until no single client can close your business.
- Measure it first. Share of turnover, share of profit and how fast they pay, for every client, from the last 12 months.
- Keep the big client, protect yourself. Written terms, stage payments, no price cuts to keep them, and watch their payment days.
- Add two or three channels, not ten, and reserve capacity. Do each properly for 30 days. If the big client fills 100% of your team, you can't say yes to anyone else.
- Plan the cash for a quiet month. Know how many weeks you can cover wages if their work stops tomorrow.
One main contractor, one developer or one architect sends you most of your work. It feels great: no marketing, no chasing, the team is always busy. Until their QS changes, a project gets cancelled, or they start paying in 60 days instead of 30. If one client gives you most of your construction work, this guide is for you.
Most builders we speak to rely on word of mouth and one or two contacts, so work comes in waves. Here's how to keep the big client and stop them being the only thing between you and an empty diary. To map your own client mix with our team, book a free strategy call.
Step 1: measure how much of your work one client gives
Gut feel isn't enough. Pull the last 12 months of invoices and build one table.
| Client (example) | Turnover | Share | Gross margin | Average days to pay |
|---|---|---|---|---|
| Main contractor A | £390,000 | 65% | 14% | 52 |
| Architect-led private jobs | £120,000 | 20% | 28% | 14 |
| Past clients and referrals | £60,000 | 10% | 31% | 10 |
| Other | £30,000 | 5% | 22% | 21 |
| Total | £600,000 | 100% |
The figures are illustrative. Run it on your own numbers. Look at three things:
- Share of turnover: what happens to wages if this line goes to zero next month?
- Share of profit: big clients often bring the volume but the lowest margin.
- Days to pay: a big client paying slowly is financing their job with your money.
In the example, two-thirds of turnover comes from one client at half the margin of the rest. That's the pattern we see most often.
Step 2: protect the relationship you have
Don't walk away from good work. Make it safer.
- Get the terms in writing: payment dates, retention and when it's released, how variations are agreed.
- Don't cut your price to keep them. It deepens the dependence and teaches them your price is negotiable.
- Watch their payment days every month. A client who drifts from 30 to 60 days is telling you something.
- Know more than one person there: the QS, the project manager and a director. People move; relationships shouldn't vanish with them.
- Keep delivering brilliantly. The point isn't to lose them. It's to stop needing them.
If payments are already slipping, read what to do when a main contractor doesn't pay.
Two-thirds of your work from one client?
Book a free call and we'll plan the next 90 days with you.
Step 3: add two or three sources of work, not ten
The temptation is to try everything at once. Doing 20 things badly gets you nothing. Pick two or three that fit your work and do them properly for 30 days, then add the next.
| If your big client is… | Add first | Why |
|---|---|---|
| A main contractor | Two or three more main contractors turning over £5–15M | Same work, same skills, less risk. See how to get onto their supplier lists |
| One architect | More small studios and interior designers | Their clients need builders, and one studio can't fill your year |
| One developer | Other small developers and property managers | Repeat work, but spread over several owners |
| Word of mouth only | Calling every past client and contact, plus a referral program | Costs nothing and starts working in days |
Adam, a builder we mentored, signed £91,796 of work in 8 days just by calling his contacts and previous clients properly. Individual results, not typical or guaranteed.
Step 4: reserve capacity for new clients
Here's the trap: the big client fills every man-day, so when a new enquiry comes in you can't take it, and the dependence grows.
- Hold back some team capacity for new clients. Tell the big client your availability honestly.
- Use subcontractors for overflow, so saying yes to a new client doesn't mean letting the old one down.
- Take one new client job at a time and deliver it as well as the big client's work.
Step 5: put sales in the diary every week
Most builders only look for work when the current job is ending. By then it's too late. A simple weekly rhythm keeps the pipeline full even when you're busy:
- Monday: new planning approvals and enquiries; pick who to call.
- Tuesday and Thursday mornings: 8–10 new calls plus follow-ups.
- Friday: send everything you promised during the week.
- Every lead in one CRM, with the source, next step and call-back date.
If quotes go out but don't convert, the leak is in your sales process, not your lead sources. Our Sales Blueprint covers the follow-up.
Step 6: plan for the quiet month
Even with new channels, the big client could stop before they're working. Know your numbers now, not in the crisis. If it has already happened, follow the plan for when building work goes quiet.
- Weeks of cover Cash in the bank divided by monthly wages plus overheads.
- Money owed What the big client owes you today, and when it's due.
- What you'd cut first Costs that don't produce work.
Our cash flow guide has a 4-week cash forecast and the 5 numbers to check every Friday.
20+ Ways to Get Construction Projects in the UK
22 ways builders find work, with scripts and a 30-day plan, so the next client isn't luck.
Get the free guideWant a pipeline that doesn't depend on one phone call?
Book a free strategy call.
The bigger picture
A business that depends on one client is really a well-paid job with extra risk. Spreading the work is what turns it into a company you could step back from, or sell.
BizMentor is one-to-one mentoring with Sviat Jay, who runs Craftex, a working London construction company. He finds the channels that fit your strengths and builds them with you, aiming for results in about four months rather than 1–3-year programs. To pick your first two channels with our team, book a free strategy call.
To see where your business is most exposed, take the free 4-minute Construction Business Scorecard. Not sure whether you need a construction business coach or a mentor? Here's the difference.
This is general information from a contractor's experience, not legal or financial advice. On the tools and under £500K a year? Watch our free training first.
This week
- A 12-month client table with share, margin and days to pay
- Written terms with your biggest client, and no price cuts
- Two new sources of work picked, with a 30-day plan for each
- Half a day a week in the diary for sales
- Your weeks of cash cover worked out
