Chimney Sweeps — A Surprisingly Profitable Trade (Tax Guide)

Chimney sweeping might conjure images of Victorian soot-covered children, but the modern reality could not be more different. Today's chimney sweeps are skilled technicians using cameras, rotary power sweeping systems, and specialist testing equipment. And here is the thing that surprises most people: it is a genuinely profitable trade.

With the surge in wood-burning stoves and the renewed emphasis on home heating efficiency, demand for chimney sweeps has grown steadily. Many sweeps are fully booked weeks in advance during the autumn and winter months, and with relatively low overheads, the margins are excellent.

This guide covers everything you need to know about running a chimney sweeping business in the UK during the 2025/26 tax year.

Why Chimney Sweeping Is More Profitable Than You Might Think

Let us look at the numbers. A typical chimney sweep charges between £60 and £90 per sweep, depending on the region and the complexity of the job. An experienced sweep can comfortably complete six to eight jobs per day.

Even at the lower end — six jobs at £60 — that is £360 per day. Over a five-day week, that is £1,800. Across a 40-week working year (accounting for quieter summer months and holidays), that is a turnover of £72,000.

Your costs are relatively modest — van running expenses, equipment, insurance, and consumables. A well-run chimney sweeping business can realistically achieve profit margins of 60–75%, which puts annual profits in the £43,000–£54,000 range. Not bad for a trade that most people overlook.

Of course, there is seasonality to factor in. September to March is peak season, while summer tends to be quieter — although stove installations, bird guard fitting, and CCTV inspections can fill the gaps.

Getting Started

Training and Accreditation

There is no legal requirement to be certified as a chimney sweep in the UK. However, professional accreditation is practically essential. Homeowners' insurance policies often require that a chimney is swept by a qualified professional, and many will specifically ask for a certificate from a recognised body.

The main accreditation routes are:

• Guild of Master Chimney Sweeps — Requires completion of their approved training course and ongoing CPD.
• HETAS (Heating Equipment Testing and Approval Scheme) — Offers chimney sweep registration, particularly relevant for wood-burning and multi-fuel installations.
• NACS (National Association of Chimney Sweeps) — Another well-established professional body.
• APICS (Association of Professional and Independent Chimney Sweeps) — Newer but growing.

Training courses typically cost £1,000–£2,000 and cover practical sweeping techniques, safety, building regulations, and the science of combustion. These costs are fully tax-deductible.

Registering as Self-Employed

You need to register with HMRC as self-employed as soon as you start trading. This is free and can be done online. You will receive a UTR number for filing your Self Assessment return.

Insurance

Public liability insurance is a must. You are working in people's homes, often near soft furnishings and light-coloured carpets, with soot and debris. Accidents — a soot spillage on a white carpet, a cracked flue liner, damage to a fireplace surround — need to be covered.

Policies for chimney sweeps typically cost £150–£300 per year depending on the level of cover. Professional indemnity insurance is also worth considering, particularly if you provide advisory services or issue safety certificates.

Understanding Your Tax

Income Tax for 2025/26

Your tax is calculated on your net profit — total income minus allowable expenses.

• Personal allowance: £12,570 tax-free
• Basic rate: 20% on profits between £12,571 and £50,270
• Higher rate: 40% on profits above £50,270

National Insurance

• Class 2 NI: £3.45 per week
• Class 4 NI: 6% on profits between £12,570 and £50,270

Given the earning potential outlined above, many chimney sweeps find themselves in the higher reaches of the basic rate band or even into higher-rate territory. That is a good position to be in, but it makes expense tracking and tax planning particularly important.

Our guide to how much tax you will pay as a sole trader can help you estimate your liability.

Expenses Chimney Sweeps Can Claim

Equipment

• Rotary power sweeping system and rods
• Manual brushes and rods
• CCTV camera and monitor (for flue inspections)
• Smoke pellets and draught testing equipment
• Industrial vacuum cleaner (with HEPA filter)
• Dust sheets, soot cloths, and containment systems
• Ladder and roof access equipment
• Carbon monoxide analyser

These are all business expenses. Smaller items can be deducted in full in the year of purchase. Larger items like a CCTV system or van may be claimed through capital allowances.

Vehicle Costs

Most sweeps operate from a van fitted out with tool storage. You can claim either:

• Mileage: 45p per mile for the first 10,000 business miles, 25p thereafter
• Actual costs: Fuel, insurance, maintenance, road tax, and capital allowances on the vehicle

For a full explanation of the two methods, see our mileage claims guide.

Professional Fees and Training

• Guild, HETAS, or NACS membership fees
• Annual certification and CPD courses
• Chimney sweeping training courses
• First aid certification

Consumables

• Certificate pads (sweep certificates for customers)
• Carbon monoxide alarms (if you supply them to customers)
• Soot disposal bags
• Protective gloves and masks
• Cleaning products

Marketing and Administration

• Website and booking system
• Google Ads and social media advertising
• Vehicle signage
• Business cards and leaflets
• Phone bill (business proportion)
• Accountancy and bookkeeping fees

For the full rundown, see our sole trader expenses guide.

Managing Cash Payments

Chimney sweeping is one of those trades where cash payments are still common. There is nothing wrong with being paid in cash, but you must declare it all. HMRC has sophisticated data-matching tools and can spot discrepancies between your lifestyle, bank deposits, and declared income.

Best Practices for Cash

• Issue a numbered certificate and receipt for every job
• Record every payment on the day it is received
• Bank your cash regularly
• Keep a separate business bank account

Many sweeps now use card readers like SumUp or Zettle, which creates automatic digital records. Some customers even prefer to pay by bank transfer. The more payments you receive digitally, the easier your record-keeping becomes.

With Accounted, you can connect your business bank account and let Penny categorise your transactions as they come in — which takes the hassle out of tracking everything manually.

VAT — Is It Relevant?

You must register for VAT when your taxable turnover exceeds £90,000 in any rolling 12-month period. Based on the earning potential discussed earlier, a busy sweep could approach this threshold within a couple of years.

The key decision is whether to register voluntarily before you hit the threshold. For chimney sweeps, most of your customers are homeowners who cannot reclaim VAT, so adding 20% to your prices makes you more expensive. Unless you have significant equipment purchases where you would benefit from reclaiming input VAT, it usually makes sense to wait until you are obliged to register.

If you are approaching the threshold, read our VAT registration guide for the full picture.

Seasonal Planning

Chimney sweeping has a distinct seasonal pattern, and managing your finances around this is important.

Peak Season (September–March)

This is when you make the bulk of your income. Demand is highest, and you can often fill your diary weeks in advance. Some sweeps increase their prices slightly during peak season, while others maintain a flat rate year-round.

Off-Season (April–August)

Domestic sweeping slows down, but there are ways to fill the gaps:

• Stove installations and servicing (if you have the appropriate HETAS certification)
• Bird guard and cowl fitting
• CCTV flue surveys for estate agents and conveyancers
• Fireplace and flue repairs
• Commercial kitchen extract cleaning

Diversifying your services reduces your reliance on seasonal demand and smooths out your income throughout the year.

Setting Money Aside

Because your income is front-loaded towards autumn and winter, it is tempting to feel flush during those months and forget about tax. Do not make that mistake. Set aside 25–30% of your profit throughout the year, ideally into a separate savings account. Your Self Assessment payment in January (right in the middle of your busy season) should not catch you off guard.

Growing Your Business

Hire a Second Sweep

Once you are consistently booked out weeks in advance, it may be time to take on an employee or train someone up. This effectively doubles your capacity without doubling your workload, as the second sweep handles jobs while you manage the business and take on the more complex work.

Build Relationships with Stove Installers

Stove installers are a natural referral source for chimney sweeps. Every new stove installation means a customer who will need annual sweeping going forward. In return, you can refer customers to trusted installers when they need a new stove.

Join Local Trade Directories

Checkatrade, Bark, MyBuilder, and similar platforms can generate leads, particularly when you are starting out. The fees are tax-deductible, and the reviews you collect provide social proof that attracts more customers.

Key Tax Dates

• 5 April — End of the tax year
• 31 July — Second payment on account
• 5 October — Registration deadline for newly self-employed
• 31 January — Self Assessment deadline and first payment on account

The Bottom Line

Chimney sweeping is a genuinely rewarding trade — both personally and financially. The demand is strong, the overheads are low, and there is real scope for growth. Keep on top of your tax obligations, claim all your legitimate expenses, and plan around the seasonal nature of the work, and you will be in a strong position.

Accounted helps UK sole traders stay on top of their bookkeeping and tax. Start your free 30-day trial at getaccounted.co.uk

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Related reading:

• How Much Tax Will I Pay as a Sole Trader?
• How to Claim Mileage When Self-Employed
• The Complete List of Sole Trader Expenses You Can Claim

Related Reading

• Security Guards and Door Supervisors — Self-Employed Tax Guide
• Event Planners and Wedding Coordinators — Freelance Tax Guide
• Speech Therapists in Private Practice — Tax Guide

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