Seamless Gutters Sized for Pacific Northwest Rain
5-inch and 6-inch K-style or half-round, formed on-site, installed with hidden hangers every 24 inches, paired with the right downspout size for actual PNW rainfall volume.
- Seamless Aluminum
- Half-Round Copper
- Gutter Repair
- Downspout Drainage
How a Gutter Install Works
Three steps from inspection to working system.
Free Inspection
We measure roof footprint, evaluate tree exposure, inspect existing fascia and soffit condition, and recommend size and material. Most inspections take 30 to 45 minutes.
Written Quote
Line-item pricing including material, downspouts, hangers, drainage tie-ins. 60-day quote validity, no vague lump sums.
Same-Day Install
Most King County residential installations complete in 1 working day. Larger or complex jobs run 1.5 to 2 days. Same crew handles tear-off and seamless install.
What We Install
5-inch K-Style Aluminum
The default for 70 percent of King County homes. Lightweight, paintable, 25-35 year lifespan. Right size for smaller homes with moderate tree exposure.
6-inch K-Style Aluminum
Necessary for larger homes, heavy tree canopy, or homes with limited downspout count. Roughly 80 percent more flow capacity than 5-inch.
Half-Round Copper
Traditional profile for craftsman, tudor revival, and modern farmhouse architectural styles. 60-80 year service life, develops natural patina.
Downspout Sizing
2x3 paired with 5-inch, 3x4 paired with 6-inch. Custom copper downspouts available for premium architectural systems.
Gutter Guards
Micro-mesh or solid surface guards for homes under heavy Douglas fir or big-leaf maple canopy. Reduces (does not eliminate) cleaning frequency.
Gutter Repair
Sagging sections, failed seams (sectional gutters), separated downspouts, fascia rot. Often the root cause of so-called roof leaks.
Drainage Solutions
Underground tie-ins to dry wells, daylight discharge, French drains. Stops downspouts from pooling water at the foundation.
Call us today or send us a message for a free roof inspection.
We offer financing
We’ve partnered with Wisetack to offer our customers flexible financing options, so you can pay over time rather than all at once. The application takes about a minute to complete, and checking your options does not impact your credit score.
- Finance projects up to $25,000*
- Terms from 3 to 120 months*
- APRs range from 0 to 35.9%*
- No hidden fees or compounding interest
Prequalify today with no impact to your credit and contact us to learn about financing your next project!
*All financing is subject to credit approval. Your terms may vary. Payment options through Wisetack are provided by our lending partners. For example, a $1,200 purchase could cost $104.89 a month for 12 months, based on an 8.9% APR, or $400 a month for 3 months, based on a 0% APR. Offers range from 0-35.9% APR based on creditworthiness. State interest rate caps may apply. No other financing charges or participation fees. See additional terms at https://wisetack.com/faqs. https://www.wisetack.com/faqs..
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Why King County Homeowners Choose Prosperity
5.0 Stars on Google and Facebook
Real reviews from real homeowners. No bots, no buyouts.
Licensed, Bonded, and Insured
Washington State licensure current. Workers comp and liability up to date.
Seamless Formed On-Site
Continuous aluminum coil cut to your exact runs. No sectional seams that leak in 8-12 years.
Honest Sizing Recommendations
5-inch when 5-inch works. 6-inch when the math actually requires it. No upsells to bigger when bigger is unnecessary.
Local Crews, Not Subcontractors
The installers on your home are Prosperity employees who work King County every week.
Wisetack Financing Available
Split gutter projects over 12 to 60 months with no penalty for early payoff.
Industry Excellence
Our Certifications & Affiliations
Master Elite® Contractor
Frequently Asked Questions
Do I need 5-inch or 6-inch gutters for my King County home?
5-inch works for smaller homes with light tree exposure and sufficient downspouts. 6-inch is necessary for homes with heavy Douglas fir or big-leaf maple canopy, larger roof footprint, steep pitch, or limited downspout count. We size based on actual roof and tree conditions, not generic defaults.
What does a gutter installation cost in King County?
5-inch K-style aluminum runs $1,350 to $3,300 fully installed for typical homes (150-220 linear feet). 6-inch costs 15-25 percent more. Half-round copper runs 3 to 5 times standard aluminum but lasts 60-80 years.
Are seamless gutters better than sectional?
For King County conditions, yes. Seamless aluminum has no joint failures, lasts 25-35 years, and is formed on-site to your exact runs. Sectional gutters with seam connectors fail at year 8-12 in PNW because the seams cannot resist constant moisture exposure.
Should I upgrade to copper gutters?
Copper makes sense on craftsman, tudor revival, modern farmhouse, or other architectural styles where the aesthetic fits. The 60-80 year lifespan justifies the cost over the life of the home. For 1980s and 1990s suburban builds, aluminum K-style is the correct match.
Do gutter guards work in Pacific Northwest conditions?
Micro-mesh and solid surface guards reduce cleaning frequency by 50 to 70 percent in PNW. They do not eliminate the need for annual maintenance because fine debris (pine needles, seed pods) accumulates on top of the guards over time. Worth the investment for homes under heavy tree canopy.
How long does a gutter installation take?
Most King County residential gutter installations complete in 1 working day. Homes with complex geometry, multiple stories, or 250+ linear feet may run 1.5 to 2 days. Same crew handles old gutter tear-off and new seamless install.
Ready for Gutters That Actually Handle PNW Rain?
Undersized gutters rot fascia, soak the deck near the eaves, and create the slow damage that becomes a roof problem 3 years later. The right gutter system prevents all of that. Free inspection and honest sizing recommendation, whether you book us or not.
Serving Western Washington — Bellevue, Renton, Kirkland, Kent, Sammamish, Redmond, Issaquah, Bothell, and surrounding communities.