How to start a roof cleaning business: soft washing, equipment, pricing and insurance

What does a roof cleaning business do?

A roof cleaning business removes the dark streaks, moss and lichen that grow on roofs, mostly on asphalt shingles in humid climates, using a low-pressure spray of cleaning solution followed by a gentle rinse. The streaks are a blue-green algae (Gloeocapsa magma) that feeds on the limestone filler in shingles; moss and lichen hold moisture and lift shingle edges. Homeowners pay because a streaked roof looks old, and because insurers and buyers sometimes flag it.

Most roof cleaning companies sell a short menu:

• Asphalt shingle soft wash. The core job. Solution applied at low pressure, left to work, rinsed or left to be rinsed by rain depending on the method.
• Moss and lichen treatment. Treat, let it die and release over weeks, then a gentle removal. Scraping live moss tears granules off shingles.
• Tile, metal and slate. Different surfaces, different dwell times and rinse methods, higher prices because of the risk and the footing.
• Gutter cleaning and house washing on the same visit, which doubles the ticket for an extra hour.

It is a natural specialty inside a pressure washing or exterior cleaning company, and many owners start there. If you have not read it yet, the pressure washing business guide covers the general setup, wash water rules and the rest of the exterior menu; this page goes deep on roofs.

Why are roofs soft washed instead of pressure washed?

Because pressure strips the protective granules off asphalt shingles and forces water under them, and the roofing industry says so plainly. Soft washing kills the growth with chemistry and lets low pressure and rain do the rinsing.

The Asphalt Roofing Manufacturers Association’s page on algae discoloration of roofs tells owners not to use a power washer or any type of brush or broom to clean algae from the roof surface, and says high-pressure washing systems are likely to damage asphalt roofing. Its cleaning method is a solution of household bleach (sodium hypochlorite) and water, left on the roof for at least 15 minutes but no more than 20 minutes, then rinsed by gently spraying with water. It also advises working from a ladder or walkboards to avoid direct contact with the roof surface. Shingle manufacturers publish their own mixing directions, and following them matters for the homeowner’s warranty.

What the solution is

Professional soft wash mixes are sodium hypochlorite (pool chlorine, typically bought at 10% to 12.5% strength) diluted with water, plus a surfactant so the mix clings to the pitch instead of running off. Roofs usually get a stronger mix than siding. Every operator settles on their own ratios by surface and growth; what does not change is the safety list:

• Never mix sodium hypochlorite with acids, ammonia or other cleaners. The mixtures release toxic gases.
• Read the product label and safety data sheet, and wear splash goggles, chemical-resistant gloves and boots. Use a respirator when the label or your exposure calls for it.
• Pre-wet plants and lawns, bag or divert downspouts, keep rinsing during the job and rinse plants again after. Dead landscaping is the most common claim.
• Cover or move cars, cushions, grills and anything with metal or fabric in the overspray zone.
• Keep the solution off copper flashing and bare metal longer than necessary, and rinse metal surfaces well.

Rinse or no rinse

Some operators rinse every roof with low pressure; others leave the solution to dry and let rain finish the job on shingle roofs. ARMA’s method rinses. Whatever you choose, tell the client what to expect: streaks often fade over days to weeks rather than disappearing on the spot, and moss turns brown and sheds over a month or more.

Pesticide rules

If you market the service as killing moss, algae or lichen, or you use a product labeled as a pesticide, your state department of agriculture may treat you as a commercial pesticide applicator and require a license. Rules differ by state, so ask before you print the brochure.

How to start a roof cleaning business, step by step

Learn the chemistry on your own roof, register and insure the business, buy a soft wash pump system and the safety gear, set prices by roof size and pitch, and sell with photos. A one-person operation with a pickup or trailer can be working within a month.

1. Practice first. Treat your own roof, a relative’s or a church’s, and photograph everything. Learn dwell times, how the mix behaves on a hot day, and how much plant rinsing really takes.
2. Register the business. Entity, name, EIN and a bank account. Our guide on an LLC for a cleaning business applies to exterior work too.
3. Check licenses. Usually a general business license, plus any contractor registration your state applies to exterior cleaning and any pesticide applicator rule. The steps in what licenses a cleaning business needs show who to call.
4. Insure before the first paid job. See the insurance section: chemical damage and height are the two things to ask about.
5. Buy the equipment. A soft wash pump system, hose, nozzles, a chemical-resistant tank, ladders and fall protection. Details below.
6. Decide your roof policy. Which pitches you will walk (ideally none), which you will do from a ladder, when you will rent a lift, and which jobs you will turn down.
7. Build a price list by roof size, pitch and growth, with a minimum charge.
8. Get the first ten roofs. Neighbors of every job, realtors, HOAs and your own before-and-after photos.

The general steps every service business shares (bookkeeping, a first budget, a simple plan) are in how to start a cleaning business.

What equipment does a soft washing business need, and what does it cost?

You need a dedicated soft wash pump (not your pressure washer) that moves solution at low pressure, a chemical-resistant tank and hose, a way to meter the mix, a rinse source, and ladders with fall protection. A starter kit costs a few thousand dollars; a full truck skid costs five figures.

Prices below come from J. Racenstein’s soft wash systems listings (a professional exterior cleaning supplier) in October 2026, so check current pages and compare other dealers before you buy.

Add the items the kits do not include:

• Chemical-resistant tank (often 50 to 100 gallons) and a water tank or hydrant access for rinsing.
• Sodium hypochlorite and surfactant, a recurring cost you build into each price.
• Fiberglass extension ladder, ladder stabilizer, roof anchor, harness and rope grab for any time you are off the ground.
• Goggles, gloves, boots and a respirator, plus a tarp set and downspout bags for landscaping protection.
• A pickup or trailer. Many owners start with the pump system in a truck bed and move to a trailer once the schedule fills.

If you already pressure wash, you can begin with a downstream injector or a small 12-volt pump for siding, but roofs need the stronger mix and the dedicated pump. The profit calculator shows how many roofs a month pay back the rig.

How do you stay safe on roof cleaning jobs?

Stay off the roof whenever you can. Spray from the ground with a long wand or from a ladder set at the right angle, rent a lift for tall or steep roofs, and turn down the jobs that would need you to walk a wet, treated, slippery slope. A treated roof is far more slippery than a dry one.

What OSHA requires once you have employees

OSHA’s general industry walking-working surfaces rule, 29 CFR 1910.28, requires employers to protect each employee on a walking-working surface with an unprotected side or edge 4 feet or more above a lower level, using guardrails, safety nets or personal fall protection. Where the work counts as construction, the roofing provisions of 29 CFR 1926.501 require fall protection on low-slope and steep roofs with unprotected edges 6 feet or more above lower levels. Either way, a two-story roof needs a system, not good balance. Solo owners are not covered by OSHA the same way, but the roof does not know that.

Ladder rules that prevent most falls

OSHA’s portable ladder safety card gives the basics: set the base a quarter of the working length away from the wall, extend a ladder used to reach a roof at least 3 feet above the point of support, and keep three points of contact. Add a stabilizer so the ladder does not crush gutters, and never lean a ladder on a surface you just treated.

Chemical safety on the job

• Mix outdoors, in the open, with eye protection on, and label every tank.
• Keep a hose running on plants the whole time the solution is on the roof above them.
• Know your runoff path. Treated water should not go into storm drains; the wash water rules in the pressure washing guide apply.
• Keep a first aid kit and an eyewash bottle in the truck, and know the product’s first aid instructions.

For a deeper look at ladder setup, roof access and the gutter work you can sell on the same visit, see how to start a gutter cleaning business.

What insurance does a roof cleaner need, and what does it cost?

General liability first, commercial auto if a vehicle or trailer carries the rig, workers’ compensation when you hire, and ask specifically about chemical damage and work at height, because standard policies sometimes exclude both.

Insureon’s pressure washing insurance cost page reports that pressure washing companies that bought through it paid an average of $73 per month, or $879 a year, for general liability, and $147 per month for workers’ compensation. Roof work can price higher because of height, so get quotes with the roof work described honestly.

Questions to ask the agent

• Is damage from chemicals and overspray covered: dead plants, spotted paint, stained concrete, corroded metal?
• Is roof work excluded, or limited to a certain height or pitch?
• Is there a care, custody or control exclusion for the roof itself, and what happens if shingles are damaged?
• Is water intrusion covered if solution or rinse water gets into the attic or behind siding?
• Is my equipment covered in the truck and at the job site?

The cleaning business insurance guide explains each policy type. This is general information; confirm coverage with a licensed agent.

How much should you charge to clean a roof?

Price by roof size, pitch, height, roof type and how much growth there is, with a minimum charge, and most residential jobs will land in the mid hundreds. Build your own numbers from timed jobs, then check them against what the marketplaces report. Per-square-foot rates, pitch factors and material multipliers are worked through in our guide to roof cleaning prices per square foot.

What the marketplaces report

• Thumbtack puts the national average at $356 to $718, with low-end jobs around $213 and high-end around $1,222. It says a roof under 1,000 square feet costs about $400 (roughly $0.40 per square foot), a 3,000 to 4,000 square foot roof about $500 to $630, and that a pressure washed (more precisely, soft washed) roof averages $475.
• Fixr gives a range of $450 to $700 with a national average of $612 for a 1,500 square foot roof, and says to expect $0.10 to $0.60 per square foot depending on method and buildup.

Price units

A worked example (hypothetical numbers)

Say a 2,000 square foot single-story shingle roof with moderate streaking takes two people 2.5 hours on site, including landscaping protection and rinsing.

• Labor: 5 hours at $24 an hour = $120
• Sodium hypochlorite and surfactant: $30
• Fuel for the truck and pump: $15
• Direct cost: $165

If you want 25% of the price for overhead (insurance, rig payments, phone, software, marketing) and 20% profit, direct cost must be 55% of the price: $165 divided by 0.55 is $300, so you quote about $300 for this roof, or $15 per square. A second story adds ladder time and risk, so add a story fee; heavy moss adds a second visit for removal. Set a minimum (many owners will not roll the truck for under $250 to $300) and bundle a house wash or gutter clean for a better hourly rate.

Put the roof type, square footage, what is included and what is not (plant damage disclaimer, no guarantee on moss removal timing) in every quote. The cleaning estimate template works for exterior work.

How seasonal is roof cleaning, and how do you fill the calendar?

Roof cleaning runs from spring through fall in most of the country and stops when temperatures approach freezing, because cold slows the chemistry and ice on a roof is deadly. On top of that, a roof needs cleaning only every few years, so repeat frequency per home is low. Plan around both.

• Stack services. House washing, gutters, driveways and window cleaning turn a $400 roof job into a $900 visit and give clients a reason to call yearly.
• Sell the maintenance plan. An annual exterior visit with a roof check and spot treatment keeps you on the calendar between full cleans.
• Work the shoulder seasons. Real estate listings in spring, pre-winter moss treatment in fall.
• Commercial and HOA work. Townhome communities and apartment complexes have dozens of roofs under one decision maker, and a two-day job can fill a slow week.
• Winter. Interior work, equipment maintenance, marketing, and in warm states, keep going.

How do you find roof cleaning clients?

Roof cleaning sells on photos, because the before and after is dramatic and visible from the street. Show the work everywhere, then work the neighbors, realtors and HOAs who see streaked roofs every day.

• Google Business Profile. Photos from every roof, the towns you serve and reviews. The cleaning company SEO guide covers setup.
• The five houses on each side. Door hangers with a photo of the roof you just cleaned and a same-street price. The flyer template is a quick start.
• Realtors and home inspectors. A streaked roof photographs badly in a listing and gets flagged in inspections.
• Insurance agents. Some carriers ask homeowners to address moss or algae before renewal; agents like having a name to give.
• HOAs and property managers. One contact, many roofs. Offer a community rate for a block of homes done in a week.
• Roofers and gutter companies. They are asked about cleaning constantly and usually do not want the job. Trade referrals.

For scripts and a weekly plan, see how to get clients for a cleaning business. As the calendar fills, booking software that keeps quotes, photos, reminders and card payments in one place matters more than any ad. Broombook is booking, scheduling and reminders for recurring service businesses; it fits the recurring side of an exterior company (annual house washes, gutter visits, maintenance plans) and the house cleaning crews many exterior owners also run. See the pricing page for plans.