12 Months Before You Sell: A Preparation Checklist

The difference between a well-prepared sale and an unprepared one is often measured in hundreds of thousands of pounds. Buyers pay more for businesses where the risks are visible and manageable, the financials are clean, and the operation runs without heavy dependence on the owner. Most of the things that improve your valuation take time to implement properly. Twelve months is the right planning horizon.

Financial Preparation

Buyers will want three years of accounts. If those accounts contain personal expenses, one-off costs, or items that a typical buyer would not incur, a good broker can help present these as add-backs to arrive at adjusted EBITDA. But this only works if the accounts are clean, consistent, and verifiable. If your bookkeeping is informal or your accounts are filed very late, this is the first thing to address.

• Ensure accounts for the last three financial years are filed and accessible
• Separate any personal expenses from business accounts going forward
• Document any one-off costs that should be treated as add-backs (e.g. one-time equipment purchases, exceptional legal costs)
• Prepare a clear breakdown of revenue by type: maintenance contracts, installations, reactive callouts, commercial vs residential
• Ensure VAT returns, PAYE records, and Corporation Tax filings are up to date

Operational Preparation

A buyer is buying a business they can run without you. The more the business depends on your personal relationships, your technical knowledge, and your daily presence, the harder it is to sell and the less it is worth.

• Identify which client relationships are held by you personally and begin transitioning them to senior engineers or an office manager
• Document operational processes: how jobs are dispatched, how contracts are renewed, how complaints are handled
• Ensure all engineers are on proper employment contracts with clear notice periods
• Put a senior engineer or operations manager in a position where they could run the day-to-day without you for at least three months
• Review your van fleet and equipment: buyers will notice deferred maintenance and factor it into their offer

Certification and Compliance

Regulatory compliance is not just a legal requirement. It is a value driver. A buyer needs confidence that on completion day, the business can continue trading without interruption.

• Ensure all engineers' Gas Safe registrations are current and renewal dates are tracked
• Renew any F-Gas certifications that are due within 18 months
• If you have MCS accreditation, ensure it is current and all paperwork is in order
• If you do not have MCS accreditation but your team has heat pump experience, consider applying: the valuation uplift typically justifies the cost
• Ensure all REFCOM certifications (if applicable) are current
• Check your public liability and employer's liability insurance: buyers will ask

Contract Book Review

Buyers will scrutinise your maintenance contracts carefully. Preparing this information in advance speeds up due diligence and builds confidence.

• Create a full schedule of all maintenance contracts: client, annual value, renewal date, years held
• Calculate your contract renewal rate over the past three years
• Convert any informal recurring clients to documented annual agreements where possible
• Review contract terms: ensure contracts can transfer to a new owner without requiring individual client consent, where possible

Client Concentration Check

Buyer concern about client concentration is one of the most common reasons for a valuation haircut. If one client represents more than 20 per cent of your revenue, buyers will factor in the risk of losing that client post-acquisition.

• Calculate the revenue concentration of your top five clients
• If one client represents more than 20 per cent of revenue, actively grow other clients to dilute the concentration before the sale
• If you have long-standing relationships with commercial clients, ensure those relationships are with the business, not just with you personally

If you are considering your options, start with a free confidential valuation. The earlier you begin the preparation process, the more options you will have when it comes to timing and terms.