Scaling From a One-Man Band: When to Take On Help

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Scaling isn't magic, it's just adding people and systems -- and each step wakes up a new bit of law. Here's how to think about it.

1. Stage 1: one-man band with regular help

You're here if it's mainly you, with the odd mate or subbie.

Key points:

• You can be sole trader or limited company -- structure choice is mainly about tax and risk at this stage.
• Legal basics:
  • Register for Self Assessment and, if in construction, CIS (as subbie and/or contractor).
  • Watch the VAT threshold -- once turnover tips over about £90k in any 12 months, you must register.
• If you're using subbies, you still need to:
  • Get their details, verify them for CIS if you're the contractor.
  • Check status -- don't treat employees as "cash-in-hand subbies" (see 8.4 and 8.10).

At this stage, your main "scaling" jobs are: keep clean books, use a separate account, and don't wing CIS or VAT.

2. Stage 2: first proper employee (1-4 staff)

Once you put someone on the books, the game changes.

You must:

• Decide their status correctly (employee vs worker vs self-employed).
• Register as an employer with HMRC and set up PAYE.
• Sort employers' liability insurance.
• Give them a written statement / contract covering pay, hours, holidays, etc. (Employment Rights Act 1996).
• Pay at least the National Minimum/Living Wage and give statutory holiday.
• Trigger auto-enrolment pension duties if they're an eligible jobholder (22 to State Pension Age, over £10k a year).

H&S wise, you still don't legally need a written policy below 5 staff, but in construction it makes sense to have at least a basic one (see 8.11).

3. Stage 3: hitting 5+ employees -- key legal thresholds

5 is a big number in UK compliance.

Once you hit 5 or more employees at any time:

• Written health & safety policy becomes mandatory -- statement, organisation, and arrangements for managing risk.
• You must also record the significant findings of your risk assessments and bring the policy to staff's attention.

On the HR side, 5+ staff is also where people start expecting:

• A more formal staff handbook -- basic policies on conduct, grievance, discipline, equality, etc.
• Some structure to holidays, sickness, overtime and training.

Auto-enrolment and PAYE don't change at 5 -- they kicked in with your first employee -- but the paper trail and expectations do.

4. Stage 4: VAT, company accounts and "bigger business" rules

Separately from headcount, there are financial thresholds to watch as you grow:

• VAT registration -- compulsory once taxable turnover in any rolling 12 months goes over about £90,000 (current UK threshold around that mark), which is common in construction.
• Company size thresholds -- if you're Ltd, recent changes increased "small/medium" cut-offs; most small construction firms will sit in the small company zone, with lighter reporting than medium/large.

As you grow you may also start tripping:

• Audit thresholds -- medium/large companies need audits; most small firms won't be there, but know it exists.
• More serious Companies House scrutiny -- late accounts, repeated penalties, and messy filings look worse when you're a bigger employer (see 8.2).

This is where having a switched-on accountant and proper bookkeeping stops being a "nice to have".

5. Practical scale-up steps at each stage

Going from 1 to 2-3 people

• Formalise: separate bank account, basic H&S policy, simple employment contracts, payroll sorted.
• Get your auto-enrolment and EL insurance right from hire one.

Going from 3 to 5 people

• Tighten H&S: draft the full written policy and start recording risk assessments properly.
• Put in basic systems: job sheets, variation forms, timesheets, toolbox talks.

Going from 5 to 10+ people

• Consider moving to a Ltd company if you're not already (risk and tax reasons).
• Add some light management structure -- working foreman, someone handling office/admin.
• Get your HR and H&S paperwork reviewed by a professional (you don't need ISO badges, just not-cowboy).

At each jump, the trick is to get ahead of the threshold -- don't wait until the week you hire person number five to think about policies.

Scale-up ladder for a small builder

Step 1 -- One-man band (0-1 on the books)

You: just you, maybe the odd casual helper or genuine subbie.

• Get the basics right: Self Assessment/CIS registration, separate bank account, clean records.
• Make sure any "subbies" are genuinely self-employed and, if you're the contractor, you're registered for CIS and verifying them.
• Keep an eye on the VAT threshold -- once turnover heads towards ~£90k in 12 months, talk to your accountant.

Step 2 -- Small crew (1-4 employees)

You: you plus 1-4 people on payroll.

• Register as an employer and run PAYE properly -- no cash-in-hand shortcuts.
• Put in written contracts and basic HR records (right to work, pay, holidays, sickness).
• Get employers' liability insurance and check your public liability still fits the bigger risk.
• Start your auto-enrolment duties and keep up pension contributions.
• Have at least a simple H&S policy and RAMS, even though under 5 you don't legally have to write it all down.

Step 3 -- Proper small firm (5-10 employees)

You: 5+ on the books, regular jobs on the go.

• Written health & safety policy now mandatory by law; plus written risk assessment findings.
• Build a basic staff handbook -- discipline, grievance, equality, holiday/sickness rules.
• Tighten up job management: standard quotes, variations forms, site files, toolbox talks.
• Make sure VAT, CIS, PAYE and pensions are all up to date -- no more winging it.

Step 4 -- Growing outfit (10+ employees and/or higher turnover)

You: several gangs, possibly multiple sites at once.

• Review your business structure -- likely Ltd, possibly group structure as you grow.
• Keep an eye on company size thresholds -- you'll stay "small" for a while, but reporting will get heavier as you climb.
• Bring in more management: foremen, someone dedicated to H&S/admin, serious bookkeeping and management accounts.
• Start thinking strategically about frameworks, tenders and bigger clients -- the compliance work you've done now starts to pay off.

If you climb this ladder one step at a time -- not trying to do step 4 jobs at step 1 -- you massively cut the risk of nasty surprises from HMRC, HSE or Companies House.

6. Common mistakes

• Growing headcount without growing systems -- 10 lads and no timesheets, no proper contracts, no written H&S policy. One HSE visit or HMRC enquiry and you're in trouble.
• Ignoring the VAT threshold until HMRC writes to you -- then you owe backdated VAT and penalties.
• Treating everyone as self-employed to avoid PAYE and pensions -- HMRC's favourite thing to investigate in construction.
• Not reviewing insurance as you grow -- your £1m PL policy from when it was just you might not cover a 10-person operation.
• Trying to run a 10-person firm from your phone -- at some point you need proper software, proper admin, and someone who isn't you doing the books.

7. Who to contact

• HMRC VAT helpline -- 0300 200 3700 (free)
• HMRC employer helpline -- 0300 200 3200 (free)
• The Pensions Regulator -- auto-enrolment duties: thepensionsregulator.gov.uk (free)
• HSE -- employer health and safety duties: hse.gov.uk (free)
• ACAS -- employment rights, contracts and HR basics: 0300 123 1100 (free)
• Your accountant -- structure advice, VAT timing, payroll setup
• FMB / NFB -- trade body support for growing construction firms

8. Sources and legislation

• Health and Safety at Work etc. Act 1974 -- section 2(3) (written policy at 5+ employees). legislation.gov.uk/ukpga/1974/37
• Employment Rights Act 1996 -- written statement of particulars (day 1 right). legislation.gov.uk/ukpga/1996/18
• Employers' Liability (Compulsory Insurance) Act 1969 -- EL insurance requirement. legislation.gov.uk/ukpga/1969/57
• Pensions Act 2008 -- auto-enrolment duties. legislation.gov.uk/ukpga/2008/30
• Value Added Tax Act 1994 -- VAT registration thresholds. legislation.gov.uk/ukpga/1994/23
• Companies Act 2006 -- company size thresholds, filing requirements. legislation.gov.uk/ukpga/2006/46

9. Related guides on this site

• 8.1 Sole trader vs limited company -- honest comparison
• 8.2 Companies House basics -- annual filings, confirmation statements
• 8.3 Business bank account -- why you need a separate one
• 8.4 Registering for CIS as a contractor
• 8.10 Taking on your first employee -- legal checklist
• 8.11 Health and safety policy -- when you need a written one
• 8.17 Partnerships in construction -- how to structure them properly

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