James Hardie Certified Installer in Seattle
GP General Corp is a James Hardie Certified Installer for the Pacific Northwest. That means our crews have completed Hardie’s installer training, we install to Hardie’s published HZ10 specifications, and the warranty stays valid — not voided.
WA License #GPGENGC830KD 
Hardie Certified Installer 
5-Star Rated 
HZ10 Spec InstallsGP General Corp is a James Hardie Certified Installer serving Seattle, the Eastside, and Snohomish County — our crews install to Hardie’s published HZ10 specifications so the manufacturer warranty stays valid, not voided. Verifiable on Hardie’s contractor locator; WA license GPGENGC830KD, MBAKS member, rated 5.0 on Google. Real installed rates on our pricing page; free written quote after an on-site assessment.
By Paul Gubenya — Owner, James Hardie Certified Installer · WA License #GPGENGC830KD · MBAKS Member · Rated 5.0 on Google · (425) 344-9635
What Homeowners Say
Real reviews from our Google profile — unedited, from real projects.
“We recently had Paul with GP General repair a damaged corner protector and sidings. His estimate was reasonable, his availability was timely, and his job was excellent. Our home hadn’t been re-painted in a while and the paint had considerably faded, yet he was able to match the color perfectly. Now we know who to turn to when in need of another repair work.”
“GP General replaced LP siding on our garage. Paul was very thorough when he came out to do the estimate; he listened to my concerns and was able to work out solutions on the spot. His crew did a great job and were very courteous. They also were careful about cleaning up (I didn’t find any nails!). Really happy with the job and can recommend GP General.”
“I highly recommend GP General Corp for siding replacement. We recently had our wood siding replaced with James Hardie lap siding, and Paul and his team did an excellent job.”
Manufacturer-Backed Training
Hardie audits and trains certified contractors on flashing, clearance, fastener spacing, joint treatment, and HZ10-specific install practices. Generic siding contractors don’t have access to that documentation or the field-rep support behind it.
Your Warranty Stays Valid
Hardie’s product warranty (30 years on HardiePlank, 15 on the ColorPlus finish) requires the product to be installed per published spec. Improper fastener depth, wrong nail head, missing flashing details, or mixing HZ5 product into HZ10 territory will void it. Certified install protects the warranty you’re paying for.
HZ10 Climate Formula
Seattle and the I-5 corridor are HZ10 territory. Hardie makes a separate fiber-cement formulation (HZ10) for our high-moisture, freeze-thaw climate. Using HZ5 product (the version built for snow, ice and hard freezes) here voids the warranty and won’t perform. Every Hardie install we do uses HZ10 product per spec.
What Hardie Certification Covers
Verify Our Certification
You should never take a contractor’s word that they’re “certified” — verify it. James Hardie publishes their certified contractor lookup so homeowners can confirm before signing.
Recent Hardie projects:
- Mercer Island Hardie reside with R-5 exterior insulation + Shou Sugi Ban accent →
- Bellevue modern new construction — white ColorPlus Hardie + metal coping →
- Bellevue new construction — Hardie mixed lap & panel with composite accents →
- Ravenna Hardie board & batten reside — hidden rot discovery →
If you’re getting bids from multiple contractors, ask each one for their Hardie certification ID and verify it at the link above. It’s a five-second check that filters out a lot of weekend warriors. And when you’re comparing actual proposals, our James Hardie siding Seattle page lays out the product lines, HZ10 spec, and real installed pricing.
Select vs. Preferred vs. Elite Preferred — Hardie’s Tiers, Explained
Searching for a local James Hardie Elite Preferred contractor? Here’s what the badges actually mean. Hardie’s Contractor Alliance program has tiers — Select Contractors at the foundation, with Preferred and Elite Preferred above. The higher tiers generally reflect a company’s Hardie install volume and how deeply it participates in Hardie’s program — many holders are large regional sales organizations.
Here’s the part that matters for your house: Hardie’s 30-year non-prorated product warranty follows the boards and the spec — correct HZ10 product, installed to Hardie’s published requirements. That’s true at every tier. A bigger badge doesn’t nail the siding to your wall; the crew does.
Straight answer about us: GP General Corp is a James Hardie Select Contractor — not Elite Preferred, and we won’t pretend otherwise. What you get instead of a sales office: Paul on your project, HZ10 installed to spec, every opening flashed, and the warranty documentation to prove it. Whichever tier a contractor claims, verify it on Hardie’s contractor locator — and ask who actually shows up Monday morning.
Ready for a Hardie Install Done Right?
Free on-site assessment with Paul. Written, line-itemized quote. Hardie HZ10 product per spec, certified install, full manufacturer warranty intact.
Get a Free Assessment →