Commercial Roofing Services in Seattle
Reliable commercial roofing for Seattle-area businesses. TPO, PVC, metal, and flat roof systems installed and maintained by K Single Corp's experienced crew.
Seattle's Trusted Commercial Roofing Contractor Since 2007
K Single Corp is a licensed Washington commercial roofing contractor (WA #KSINGSC842B3), bonded, insured, and BBB accredited. Since 2007 our crews have completed more than 15,000 projects across the Puget Sound, including warehouses, retail centers, restaurants, multi-family buildings, and office properties. Property managers and building owners trust us for clean documentation, references on request, and a 4.7-star rating across 172+ Google reviews.
We install and service every major low-slope and commercial system: TPO and PVC single-ply membranes, EPDM rubber, modified bitumen and torch-down, standing seam metal, and silicone or acrylic roof coatings. Whether you need a full tear-off, a re-cover, emergency leak response, or a scheduled maintenance contract, our factory-certified crews deliver phased installs that keep your operations running and your tenants in place.
Licensed & Insured
WA #KSINGSC842B3, fully bonded, general liability + workers comp on every project.
10-Year Warranty
Workmanship warranty on every install, plus manufacturer material warranties up to 30 years.
4.7-Star Google
172+ Google reviews across King, Snohomish, and Pierce counties since 2007.
What's included with our commercial roofing service
- ✓ TPO membrane systems
- ✓ PVC membrane systems
- ✓ Modified bitumen / torch down
- ✓ EPDM rubber roofing
- ✓ Standing seam metal
- ✓ Roof coatings & restoration
- ✓ Maintenance contracts
- ✓ Emergency leak response
Get a Free Commercial Roofing Estimate
Most estimates scheduled within 48 hours. No obligation, no high-pressure sales, written line-item quote.
Request Free Estimate Call (206) 659-4349172+ verified Google reviews from Seattle, Bellevue, Kirkland, and Greater Seattle homeowners.
K Single Corp has installed and maintained commercial roofing systems across the greater Seattle area since 2007, serving retail, office, warehouse, and multi-family properties. Browse our commercial roofing portfolio for completed examples, or contact us for a free estimate.
Commercial roofs in the Pacific Northwest face challenges that residential roofs do not. Flat and low-slope designs (TPO, PVC, modified bitumen) must handle Seattle’s 37+ inches of annual rainfall without ponding, while also supporting heavy HVAC equipment, foot traffic from maintenance crews, and the thermal movement that comes with large roof surfaces. Drainage engineering is not optional here. It is the single most important factor in a commercial roof’s long-term performance.
Why Commercial Roofing
What Sets Us Apart
Minimal Business Disruption
We schedule around your operating hours. Weekend, after-hours, and phased installation options keep your business running.
Every Major Flat Roof System
TPO, PVC, EPDM, standing seam metal, modified bitumen, and roof coatings. We match the right system to your building.
Property Manager Ready
Detailed documentation, progress updates, photo reports, and warranty packages built for property records and compliance.
Maintenance Programs
Bi-annual inspections, drain clearing, membrane patching, and condition reports. Extend your roof life 5 to 10 years.
25+ Years Commercial Experience
Retail, office, warehouse, multi-family, restaurant, and industrial. We have done it all across the Puget Sound.
15,000+ Projects Completed
Proven track record across the greater Seattle area since 2007. Licensed, bonded, and insured in Washington State.
At a Glance
WA License
KSINGSC842B3
Credentials
Licensed, Bonded, Insured
Service Area
King, Snohomish, Pierce
Warranty
10-year workmanship
Systems & Options
Commercial Roofing Systems We Install
TPO Membrane
The most popular flat roof system for commercial buildings. Excellent waterproofing and energy-efficient white reflective surface.
PVC Membrane
Ideal for restaurants and industrial buildings where chemical and grease resistance matters. Superior weld seam strength.
EPDM Rubber
A proven single-ply membrane for large flat roofs. Cost-effective with strong weather resistance and easy repairs.
Standing Seam Metal
Extremely durable metal roofing for sloped commercial structures. Low maintenance and strong performance in high-wind areas.
Modified Bitumen
Multi-layer system for buildings needing extra durability and waterproofing. Well-suited for roofs with moderate foot traffic.
Roof Coatings
Silicone and acrylic coatings that extend the life of an existing commercial roof without full replacement.
Our Commercial Roofing Process
Site Assessment
We inspect your building's roof, document conditions, and assess drainage, insulation, and structural requirements.
System Recommendation
Based on your building type, budget, and performance needs, we recommend the best roofing system. Options, not pressure.
Detailed Proposal
Written proposal with material specs, labor breakdown, timeline, warranty details, and total cost. No hidden fees.
Scheduled Installation
We coordinate with your schedule to minimize tenant and business disruption. Weekend and after-hours work available.
Inspection + Documentation
Final inspection, warranty documentation, and a maintenance guide for your property records.
Site Assessment
We inspect your building's roof, document conditions, and assess drainage, insulation, and structural requirements.
System Recommendation
Based on your building type, budget, and performance needs, we recommend the best roofing system. Options, not pressure.
Detailed Proposal
Written proposal with material specs, labor breakdown, timeline, warranty details, and total cost. No hidden fees.
Scheduled Installation
We coordinate with your schedule to minimize tenant and business disruption. Weekend and after-hours work available.
Inspection + Documentation
Final inspection, warranty documentation, and a maintenance guide for your property records.
Built for Pacific Northwest Conditions
Commercial Roofing in Seattle's Climate
37+ inches of annual rain, 150+ overcast days, salt-air drift off Puget Sound, freeze-thaw at higher elevations. Every commercial roofing project we deliver is spec'd for what Seattle actually throws at it.
Seattle Rainfall & Drainage
With 37+ inches of annual rainfall, commercial drainage cannot be an afterthought. We engineer slope, scuppers, and internal drains to move water off low-slope roofs before it finds a seam or penetration.
Ponding Water Protection
Standing water that lingers past 48 hours breaks down membranes and voids manufacturer warranties. We address dead spots with tapered insulation, crickets, and proper drain placement during every install.
HVAC & Penetration Sealing
Rooftop units, vents, curbs, and conduit are the most common leak sources on PNW commercial roofs. We install heat-welded flashings and reinforced details around every penetration, then re-inspect annually.
Low-Slope Membrane Performance
Flat and low-slope roofing in Seattle runs $4 to $11 per square foot installed. TPO runs $5 to $9, PVC $6 to $11, and torch-down modified bitumen $4 to $8. We match the membrane to your building's traffic, chemicals, and budget.
Recent Work
Commercial Roofing Projects in Seattle
I'm a business owner in Seattle, WA and we have a flat roof that needed multiple repairs. I really enjoyed working with...
K Single has completed two roof repairs for me; one on my house and one on a commercial building I own. Both jobs were d...
I've used them in the past on a small commercial building and they did a great job. Now they're doing my home and so far...
Very professional and services are done at a very high level. Our company owns several properties and have used them for...
My job was very challenging. Actively leaking torchdown flat roof in winter over the holidays during an atmospheric rive...
We purchased our home 14 years ago. Our roof started to leak. After investigating the cause, it was apparent there were...
Common Questions
Frequently Asked Questions
How much does a commercial roof replacement cost in Seattle?
What is the best commercial roofing system for Seattle's climate?
How long does a commercial roof installation take?
Does K Single Corp handle commercial roof maintenance?
Can you repair my commercial roof without a full replacement?
Is K Single Corp licensed for commercial roofing in Washington?
Do you work with property managers and building owners?
Other Services We Offer
From roofing to siding, gutters, decks, and more. K Single Corp handles it all.
Residential Roofing
Complete residential roofing services for Seattle-area homeowners. From full replacements to storm damage repairs, K Single Corp delivers proven results backed by 25+ years of experience.
Roof Installation
Professional new roof installation for Seattle homes and businesses. Every material type, expert crews, and a 10-year workmanship warranty from K Single Corp.
Roof Repair
Fast, reliable roof repair for Seattle homes and businesses. Fix leaks, storm damage, missing shingles, and flashing failures.
Siding
Professional siding installation and replacement for Seattle homes. Vinyl, fiber cement, wood, and engineered options. Boost curb appeal and energy efficiency.
Ready to Get Started?
Request a free estimate and find out why 15,000+ homeowners trust K Single Corp.
Most estimates completed within 24 hours.