Capitol Hill DADU New Construction HardiePanel and Lap Siding Installation

This Capitol Hill / Madison Valley, Seattle, WA project was built as a complete exterior case study, not just another list of siding materials. KV Construction looked at the house as a full wall system: what had to come off, what had to be checked behind the old siding, how water would be managed around windows and doors, and how the finished exterior should feel in its local setting.

Seattle DADUs are small buildings, but their envelope details matter as much as a full-size home. Around Capitol Hill and Madison Valley, compact lots and tight setbacks make it especially important to finish the siding cleanly, manage water around every opening, and keep the exterior proportions sharp.

The core installation centered on Smooth 8 1/4-inch primed Hardie lap siding with a 7-inch reveal. Smooth lap siding and trim helped the DADU feel modern and intentional, while the HardieWrap and flashing package protected the smaller structure from the same Seattle rain as the main house. The work also included new construction DADU siding, Allura trim, slope seal at windows, smooth Hardie lap siding, which made the project more layered than a standard siding replacement and gave the final result a stronger sense of place.

Coordinating the Exterior Before the Building Was Closed In

Because this was a new construction scope, KV Construction coordinated the siding sequence around the builder’s schedule, framed openings, trim layout, and weather barrier. That matters in Seattle and the broader PNW because the best time to protect the wall assembly is before small sequencing issues become hidden behind finished siding.

Weather Barrier, Flashing, and Rain Control

Pacific Northwest siding work has to respect water. On this project, the weather barrier was HardieWrap paper with 1 1/2-inch Hardie seam tape. Flashing details included 4-inch HardieFlash tape, 26GA window head flashing, slope seal on bottom of windows, primed flashing, and Z metal flashing. HardieWrap, seam tape, and detailed flashing created the water-management layer behind the siding, which is the part homeowners rarely see but rely on every winter. QUAD MAX sealant was used at key transitions so trim, blocks, windows, doors, and siding could work together instead of becoming separate weak points.

Material Choices That Fit the Home

The main siding choice was Smooth 8 1/4-inch primed Hardie lap siding with a 7-inch reveal. KV Construction paired that with Smooth Allura 5/4×4 outside corners, window trim, and door trim. This is where a case study becomes more than a materials list: the profile, reveal, texture, trim depth, and finish all influence how the home reads from the street and how well the edges are protected.

Details That Made This Project More Complete

Several project details shaped the final result: Window and door openings flashed as part of the DADU envelope; New construction detached accessory dwelling unit. These items matter because siding replacement often exposes the places where older exteriors were weakest: soffits, corners, window transitions, door openings, insulation gaps, or paint systems that no longer protect the home well.

Outcome and Homeowner Value

The finished project gives the home a more complete exterior system, with the visible siding, trim, soffit, window/door details, and hidden water-management layers all tied into one scope. The result is the kind of project KV Construction wants to be known for: practical, well-organized, and built around a full siding replacement mindset suited to Seattle-area and Pacific Northwest weather.

Project Specifications And Materials

Request a Free Siding Consultation

Talk with KV Construction about a full siding replacement, James Hardie exterior upgrade, or larger moisture-related siding project built for Pacific Northwest weather. KV Construction is owner-operated, uses consistent crews, follows disciplined flashing and QUAD MAX sealant standards, and backs its work with a 5-Year KV Workmanship Warranty. Request a free siding consultation to review your exterior, materials, waterproofing details, and project fit.