How much does exterior cleaning cost in Harrow?

Most homes in Harrow should have gutters cleaned at least twice a year, ideally in autumn after leaves fall and in spring. Properties near trees may need quarterly cleaning. Signs you need gutter cleaning include water overflowing during rain, sagging gutters, plants growing from gutters, or damp patches on external walls. Regular cleaning prevents expensive water damage to your property.

Is pressure washing safe for my driveway or patio?

Yes, when done professionally. We adjust water pressure based on your surface type. Block paving, concrete, tarmac, and natural stone all require different pressure settings. Our experienced team knows exactly how to clean each material effectively without causing damage. DIY pressure washing often causes problems because people use too much pressure. We get it right first time.

Will roof cleaning damage my tiles?

No. We use soft washing techniques specifically designed to protect roof tiles while removing moss, algae, and lichen. Unlike high-pressure washing which can crack tiles and force water under them, our method is gentle yet highly effective. We've cleaned thousands of roofs across Harrow without a single tile damaged. Your roof is safe in our hands.

Do I need to be home during the cleaning service?

Not necessarily. For exterior services like gutter cleaning, pressure washing, and window cleaning, you don't need to be present as long as we have access to outdoor taps and the areas being cleaned. We'll take before and after photos and send them with your digital invoice. Many of our regular customers leave us to work while they're out. Our reviews often mention how much they trust us with property access. Just let us know your preference when booking.

What equipment do you use for window cleaning?

We use a pure water fed pole system for most window cleaning jobs. This produces streak-free, spotless results without chemicals. The purified water dries naturally without leaving marks. For interior windows or specific requests, we also use traditional methods with professional-grade squeegees and cleaning solutions. Our equipment reaches up to four storeys high safely from the ground.

Can you clean my gutters if they're very blocked?

Absolutely. Heavily blocked gutters are our specialty. We use industrial vacuum equipment that handles even the worst blockages, including compacted leaves, moss, and debris. We'll also clear downpipes and check the entire gutter system is flowing properly. If we find any damage or issues during cleaning, we'll let you know immediately so you can arrange repairs.

What's the difference between pressure washing and soft washing?

Pressure washing uses high-pressure water to blast away dirt, perfect for hard surfaces like driveways and patios. Soft washing uses lower pressure with specialised cleaning solutions, ideal for delicate surfaces like roofs, render, and painted surfaces. We choose the right method for your specific surface to get excellent results without damage. Sometimes we use both techniques on different areas of the same property.

Do you offer regular maintenance contracts?

Yes. Many of our five star customers book regular window cleaning every 4 to 8 weeks, gutter cleaning twice yearly, or annual pressure washing. Regular maintenance keeps your property looking great and prevents minor issues becoming expensive problems. We offer flexible scheduling and discounted rates for recurring customers. Our Google reviews frequently mention customers who've used us for years. Just ask about setting up a maintenance plan that suits your property and budget.

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How Long Does Roof Cleaning Take? What to Expect on the Day

Q: How long does roof cleaning take?

A typical residential roof cleaning takes between 4 to 8 hours depending on roof size, pitch, and the level of moss coverage. We work carefully to ensure thorough cleaning without rushing. Most jobs are completed in a single day. We'll give you an accurate timeframe when we quote. The results last for years, making it a worthwhile investment in your property.

Home Blog How Long Does Roof Cleaning Take? What to Expect on the Day

Booking a roof clean can feel like a big deal. Contractors on your roof, scaffolding questions, a day lost waiting around. Most people just want to know how long it will take and whether they need to be in.

We clean roofs for homeowners across Harrow, Pinner, Stanmore and North West London. This guide walks through what happens on the day, what affects the timings, and what you need to do before we arrive.

How Long Does Roof Cleaning Take?

Most roof cleans take between 2 and 8 hours, depending on the size of the roof. Checkatrade’s UK cost guide (April 2026) gives these estimates:

Small roof, about 65 square metres (terrace or small semi): 2 to 4 hours
Average roof, about 75 square metres (semi or small detached): 4 to 6 hours
Large roof, about 85 square metres (detached): 6 to 8 hours

These are estimates. A proper quote should give you a realistic time for your own home before you book.

The honest answer is that it depends on the roof. A proper quote should give you a realistic time for your home before you book.

What Affects How Long It Takes

Roof size: a bigger roof means more surface to cover
How much moss and growth there is: thick moss takes more careful removal
Pitch and access: steep roofs and tight access take more time to set up safely
Extensions and outbuildings: garages and rear extensions add to the job
Weather: wind and rain can delay or pause the work

What Happens During Roof Cleaning

Every roof is different, but the process usually follows the same steps.

Step 1: Survey and Setup

We look over the roof and the area around it first. We check the tiles, the access and where the moss is thickest. Then we protect the areas below, such as patios, plants and cars, and set up safe access.

Step 2: Moss and Debris Removal

Loose moss and debris are taken off first, using gentle methods suited to your tiles. Roof tiles are not a driveway, so heavy pressure isn’t the answer.

Worried about damage? Read our guide: does roof cleaning damage tiles.

Step 3: Cleaning and Treatment

The roof is then cleaned and treated to deal with what’s left. Treatment helps to slow the moss and algae coming back. You may notice the roof carries on improving over the following weeks as the treatment does its job.

Step 4: Gutters, Tidy Up and Final Check

Moss that comes off the roof often ends up in the gutters, so these get checked and cleared. We tidy the area, run a final check and take photos of the finished job.

If you want the gutters done at the same time, see our roof cleaning service in South Harrow page.

Do I Need to Be at Home?

Usually not. Most of the work happens outside. What we normally need is:

Clear access to the sides and back of the property
Cars moved from the driveway if they’re in the way
An outdoor tap if one is available
A way to contact you if we need a decision on the day

If you’d rather be there for the start or the sign off, that’s fine too.

Will the Weather Affect the Date?

It can. Wet, windy or icy conditions make roof work unsafe, so we’d move the date rather than risk it. Safe working at height matters, and the Health and Safety Executive publishes guidance on it.

You can read the HSE’s guidance on working at height

How to Prepare for the Day

Move cars and garden furniture away from the sides of the house
Make sure we can get to side gates and the back garden
Tell us about anything fragile, such as plants, glass or a conservatory roof
Let us know about pets so we can plan around them

If you’re looking for a trade body to check roofing standards, the National Federation of Roofing Contractors is a useful place to start.

The Bottom Line

Most roof cleans take between 2 and 8 hours, but the real answer depends on your roof. The size, the amount of moss, the access and the weather all play a part. A good company will tell you what to expect before booking, and will explain each step.

If you want to understand how moss is removed first, read how to get rid of moss on roof tiles.

Elite Spotless Solutions covers Harrow, Pinner, Stanmore, Ruislip, Northwood, Watford and across North West London. Call 07751 890709 for a free, no obligation quote and a realistic time estimate for your roof.

Frequently asked questions

Q1: How long does roof cleaning take for an average house?

Checkatrade (April 2026) estimates 2 to 4 hours for a small roof of about 65 square metres, 4 to 6 hours for an average 75 square metre roof, and 6 to 8 hours for a large 85 square metre roof. The size, pitch, amount of moss, access and weather all affect the time. A good quote should give you a realistic estimate before you book.

Q2: What happens during roof cleaning?

A professional roof clean usually starts with a survey and protecting the area below. Moss and debris are then removed using gentle methods suited to your tiles, followed by cleaning and treatment. The gutters are cleared, the area is tidied and the finished job is checked and photographed.

Q3: Why does roof cleaning take longer than cleaning my gutters or windows?

A roof clean involves safe access at height, protecting the ground below and working carefully across the whole tile surface. Gutters and windows are usually much smaller jobs. The exact time depends on the size and condition of your roof, and a good company will give you an estimate when they quote.

Q4: Do I need to be at home while my roof is cleaned?

Usually not. Most of the work is outside, so we mainly need access to the sides and back of the property. It helps if we can reach you in case we need a decision on the day. You’re welcome to be there if you’d prefer.

Q5: Will roof cleaning make a mess in my garden?

Some moss and debris will come down during the job. We protect patios, plants and cars first, and we clear the gutters and tidy up afterwards. Ask the company how they handle this before you book.

Q6: What if it rains on the day of my roof cleaning?

Wet, windy or icy weather can make working on a roof unsafe, so a good company will rearrange rather than risk it. Light drizzle isn’t always a problem, but safety comes first. We’ll let you know as early as possible if the date needs to move.

Q7: Why does the moss still look there after my roof was cleaned?

Treatment applied to a roof can keep working for some weeks after the clean, so the roof may carry on improving. It’s normal for the finish to settle over time. If you’re unsure, contact the company and ask what to expect.

Q8: How long does roof cleaning last before moss comes back?

It depends on the roof, how shaded it is and how damp the area is. Roofs under trees or in shade tend to see regrowth sooner. Treatment helps to slow it down, and a regular check helps you spot growth early.

Q9: Is roof cleaning a safe job to do myself?

Working at height is risky, and falls from roofs cause serious injuries. Roof tiles can also be damaged by the wrong method. A professional has the equipment and training to do it safely, and the HSE publishes guidance on working at height.

Q10: How do I prepare my house for a roof cleaner?

Move cars and garden furniture away from the sides of the house, and make sure we can reach side gates and the back garden. Tell the company about fragile items, plants or pets. A clear outdoor tap, if you have one, also helps.

Q11: Can gutters be cleaned at the same time as my roof?

Yes, and it usually makes sense. Moss and debris from the roof often end up in the gutters, so clearing them at the same visit saves a second trip. Ask when you request your quote.

Q12: Do you offer roof cleaning near me in Harrow and North West London?

Yes. We cover Harrow, Pinner, Stanmore, Ruislip, Northwood, Watford, Bushey and the surrounding areas. We’re based in South Harrow (HA1). Call 07751 890709 for a free, no obligation quote.