Office · Retail · Warehouse · Industrial
Commercial Roofing in Philadelphia
Flat and low-slope commercial roofing done right — installed, repaired, and maintained on a schedule that keeps your business running. Serving the Philadelphia tri-state area.
GAF Certified
In-house crews
OSHA compliant
Documented inspections
Get Your Free Commercial Roofing Assessment
Tell us about your building — no obligation.
Free, no-obligation, itemized. We’ll tell you straight what it needs.
Built for Buildings
Commercial Roofing is Different
Bigger surface areas, flat and low-slope systems, real drainage planning, and a schedule that can’t grind your operation to a halt. Commercial roofing takes a contractor who works at that scale — and Garrison does, across offices, storefronts, warehouses, and light industrial buildings throughout the tri-state area.
We’re GAF certified with in-house crews, so the people on your roof work for us, not a subcontractor you’ve never met. You get a straight assessment, a system matched to your building, and a roof that holds up.
Low-slope & flat systems
Commercial Systems We Install
We match the system to your building, your use, and your budget.
01
TPO
TPO roofing installation is one of our most-requested commercial systems — a reflective single-ply that’s the energy-efficient workhorse of low-slope roofing.
02
EPDM
Tough rubber membrane built for large, flat commercial surfaces and long service life.
03
PVC
A strong single-ply where grease or chemical resistance matters — restaurants and manufacturing.
04
Built-Up (BUR)
The proven multi-layer system for heavy-duty flat roofs that take real punishment.
04
Modified Bitumen
A rugged membrane for high-traffic and demanding low-slope applications.
04
Metal
Standing-seam and panel systems for the right commercial building and roofline.
Full service
Install · Replace · Repair · Maintain
01
Installation
New construction and re-roofs, built to manufacturer spec with detailed drainage planning.
02
Replacement
Full tear-off and replacement past service life — phased on large buildings so you stay open.
03
Repair
Failed seams, flashing, and drainage — found and fixed before they reach your operations.
04
Maintenance Programs
Ongoing commercial flat roof maintenance with quarterly inspection reports and thermal-drone scans.
Commercial
We Keep You Open
We Work Around Your Business
A leaking roof over a running business can’t wait, and the fix can’t shut you down. We plan the work to keep you operating:
- Phased installation on large properties so sections stay in use
- Scheduling built around your hours for business continuity and occupant safety
- Strict OSHA compliance and on-site safety protocols on every project
Thermal-Drone Candidacy Scan
Evidence, not guesses
We Find the Leak — Even on 100,000 Sq Ft
Pinpointing a small leak on a massive flat roof is its own skill. A visual walk misses it; cutting open the wrong section wastes your money. We use thermal-drone moisture scanning to read exactly where water is getting in and sitting under the membrane, then document it with photos in a written report.
That proof-based approach is something we already do for property portfolios — and almost no commercial roofer in this market offers it to individual building owners. You get evidence before anyone spends a dollar.
Who We Serve
Building Types We Roof
From retail and office roofing to large-format warehouses, we’re an experienced warehouse roofing contractor across the Philadelphia tri-state area.
Office Buildings
Retail & Storefronts
Warehouses
Light Industrial
Mixed-Use
Straight About Pricing
What Commercial Roofing Costs
Commercial pricing depends on the size of the roof, the system, the condition of what’s underneath, and access. Rather than throw out a number that means nothing, we inspect the roof and give you a free, itemized quote you can plan around.
No obligation, and no surprises once the work starts. You’ll know exactly what the project costs and why before we begin.
★★★★★
"Garrison roofing company was Great Job was Done on time an excellent experience"
Patrick S.
Google review
★★★★★
"I had my back lower roof done the guys were fast and professional. I will use Garrison roofing again."
sierra B.
Google review
★★★★★
"Always available for our repairs! Been working with them since 2021"
Lanae S.
Google review
Our Work
COMMERCIAL ROOFING PROJECTS
New installs, re-roofs, and restorations across Philadelphia-area commercial and industrial properties.
Good Questions
Frequently Asked Questions
What roofing system is best for a flat commercial roof?
It depends on the building and how it’s used. TPO is a popular reflective single-ply for many low-slope roofs; EPDM is a durable rubber option for large flat surfaces; PVC stands up where grease or chemicals are in play; built-up and modified bitumen suit heavy-duty applications. We assess your roof and use, then recommend the right fit instead of a one-size answer.
How much does commercial roof replacement cost in Philadelphia?
It varies with roof size, the system you choose, access, and the condition of the existing deck. We give you a free, itemized quote after inspecting the roof, so the number reflects your actual building rather than an average — and since the assessment is free, there’s no commercial roof inspection cost to get that number.
How often should a commercial roof be inspected?
Regularly — many owners inspect quarterly and after major weather. Our preventive maintenance program includes scheduled inspection reports so problems get caught early, before they reach your interior or inventory.
Can commercial roof repairs be scheduled around business hours?
Yes. We schedule work to keep your business running, including phased installation on large properties and timing that maintains business continuity and occupant safety.
Free & No-Obligation
Get a Free Commercial Roof Assessment
Install, replace, repair, or maintain — from a GAF-certified contractor who documents the work and schedules around your business.