Flat roof and balcony waterproofing
Seal leaking flat roofs, balconies and terraces with liquid or membrane systems.
- £2k-10k
- Part-time
- Out and about
Estimates for a small start in the UK, not guarantees.
Official data
37,269 UK companies in this field, 29% registered in the last 2 years
SIC 43290 “Other construction installation”. Source: Companies House, November 2026.
What it is
Applying waterproof coatings or membranes to flat roofs, balconies, terraces and small extensions to stop leaks. Includes repairs, re-coating and full re-covers.
Your first three steps
- Get trained on one or two systems, as many liquid and membrane manufacturers run approved installer training
- Buy basic tools, access equipment and a first batch of materials, then build a small portfolio with before and after photos
- Introduce yourself to local builders and property managers and offer to quote for roof repairs
Who pays
Homeowners, landlords, small commercial property owners and building firms who sub-contract the work.
How it makes money
Fixed price per job based on roof area and system used. Repeat work can come from builders and property managers.
Skills that help
- Comfortable working at height
- Practical building skills
- Careful surface preparation
- Measuring and quoting
Watch out for
- Public liability insurance, and check whether your cover includes work at height
- Safe working at height and scaffolding or edge protection, check the current rules
- Weather dependency, so plan for delays and rescheduling
- Manufacturer guarantees often depend on approved installer status, check the conditions
- Hot works such as torch-on felt need extra safety precautions and insurance checks
Deep research report · UK
Everything you need to start: flat roof and balcony waterproofing
Researched with live web search for United Kingdom: real startup prices, the licences and rules, what others charge, a break-even example, how to find your first customers and a 30-day launch plan. With sources.
- Startup costs with real prices
- Licences, registration and rules
- Pricing: what others charge
- Break-even example
- Finding your first customers
- 30-day launch plan
- Risks and how to reduce them
Questions people ask
How much does it cost to start a flat roof waterproofing business?
Startup costs are typically around £2,000 to £10,000, depending on tools, materials, access equipment and insurance. These are estimates, so get quotes for equipment and cover before taking on work.
How much can a waterproofing contractor earn?
Monthly revenue is typically around £2,000 to £9,000, depending on job size, how many jobs you complete and your pricing. These are estimates, and weather can cause delays and rescheduling.
What should I check before waterproofing roofs and balconies?
Check public liability insurance covers work at height, and the current rules on safe working at height, scaffolding or edge protection. Hot works such as torch-on felt need extra safety precautions and insurance checks.
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