Bigger roof.
Bigger system.
Offices, retail, medical, restaurants, warehouses, and multi-unit buildings. We size commercial gutters to the roof, schedule the work around your business, and keep the water off your customers and out of the building.
A commercial roof sheds far more water than a house, so it needs a bigger system. That usually means 6-inch gutters or larger, oversized downspouts, and more drops, sized to the roof area instead of a standard house spec. Get it wrong and the overflow becomes a tenant complaint, a slip hazard by the door, or water inside the building.
We install, repair, and maintain commercial gutters across New Hampshire, and we schedule the work around how your building runs. Commercial jobs are quoted per building, because roof size, access, and scope all move the number.
How commercial differs from a house
It is the same idea at a different scale, and the scale changes what the job needs.
| Residential | Commercial | |
|---|---|---|
| Typical gutter | 5-inch, sometimes 6-inch | 6-inch and larger, box gutters on some roofs |
| Downspouts | 2×3 or 3×4 inch | Oversized, and more of them |
| Roof type | Pitched | Often flat or low-slope |
| Scheduling | A day at the house | Worked around business hours and access |
| Upkeep | Twice a year | Often a scheduled maintenance plan |
Buildings we work on
If it is a commercial property in our area, we most likely handle it. Common ones include:
| Property | What matters most |
|---|---|
| Offices & professional buildings | Clean entrances, no overflow on walkways |
| Retail & restaurants | No disruption to customers or parking |
| Medical & dental | Safe, dry entries and reliable drainage |
| Warehouses & light industrial | Big roofs that need real capacity |
| Multi-unit & condo | Protecting the structure and the tenants |
Why capacity is the whole game
On a house, an undersized gutter is an annoyance. On a commercial roof it is a liability. A large flat or low-slope roof can send a wall of water to the edge in a hard New Hampshire rain, and if the gutters and downspouts cannot move it, it sheets over onto the entrance, pools in the lot, freezes into a hazard, or backs up under the roof edge. We size the system to the actual roof and rainfall so it carries the load, then route it where it does no harm.
| System | How it works | Right for |
|---|---|---|
| 6-inch seamless | A larger K-style gutter with more capacity than a house gutter | Pitched commercial roofs and larger homes |
| Box gutter | A deep, high-volume rectangular gutter built for heavy flow | Big roofs and long runs that overwhelm standard gutters |
| Oversized downspouts | Larger drops, and more of them, to move the volume down | Any commercial roof, paired with the gutter above |
| Low-slope drainage | Edge gutters and scuppers designed to the roof plan | Flat and low-slope commercial roofs |
We work around your business
The gutters are only half of a commercial job. The other half is doing it without shutting you down. We schedule early, after hours, or in stages, keep entrances and parking clear during your busy times, and stage the work so your customers and tenants barely notice we were there. On an occupied building, that is the difference between a good contractor and a headache.
Scheduled maintenance for property managers
For a commercial building, letting the gutters go until something fails is the expensive path. We set up routine cleaning and inspection on a schedule, so clogs, sags, and small leaks get caught before they turn into a tenant complaint, a slip-and-fall claim, or water inside the building. Property managers use it to stay ahead of the roofline instead of reacting to it, and it makes budgeting predictable.
What it costs
Commercial work is quoted per building, because no two are the same. Roof size and pitch, the number of stories, access and staging, and whether you need a new install, a repair, or an ongoing maintenance plan all move the number, so there is no flat rate to post. We walk the property, scope exactly what it needs, and give you a firm written quote.
Commercial questions.
Do you do commercial gutter work?+
Yes. Alongside homes, we install, repair, and maintain gutters on commercial buildings across New Hampshire, offices, retail, medical, restaurants, warehouses, and multi-unit properties. Commercial work is bigger and has more moving parts than a house, and we scope it to the building.
What size gutters does a commercial building need?+
Commercial roofs shed a lot more water, so they usually need 6-inch gutters or larger, oversized 3 by 4 inch downspouts, and more drops than a house. On flat and low-slope roofs the design changes again. We size the whole system to the roof area and the rainfall, not to a standard house spec.
Can you work around our business hours?+
Yes. We schedule around how your building runs, early, after hours, or in stages, so we are not blocking entrances, parking, or customers during your busy times. Keeping the disruption off your operation is part of the job on a commercial property.
Do you offer scheduled maintenance for commercial properties?+
Yes, and for a commercial building it is worth it. We can set up routine cleaning and inspection on a schedule so clogs and small failures get caught before they become a tenant complaint, a slip hazard, or water inside the building. Property managers use it to stay ahead of problems.
How much does commercial gutter work cost?+
Commercial jobs are quoted per building, because the roof size, the number of stories, access, and whether it is an install, a repair, or ongoing maintenance all change the number. There is no flat rate, so we walk the property and give you a firm written quote for the scope you need.
How do you handle drainage on a flat or low-slope commercial roof?+
Flat and low-slope roofs drain differently than a pitched house, so we design the edge gutters, scuppers, and oversized downspouts to the roof plan and the rainfall, not to a standard house spec. We size the whole system to carry the load and route it where it does no harm.
Last updated August 30, 2026
Pairs well with.
Keep the water off your customers.
Tell us about the property, and we will walk it and quote the install, the repair, or a maintenance plan, free.