ADU Construction in Longview

Longview is roughly 2.5 hours south of Seattle on I-5 — Vladislav makes the drive for ADU and remodel projects in the right scope range, generally $80,000 and up. Initial phone calls happen within 24-48 hours; site visits are typically scheduled within 1-2 weeks of that first conversation, depending on the project calendar. The on-site visit is necessary for ADU work — soil conditions, utility access points, lot geometry, and existing foundation conditions can't be assessed from a satellite photo. Call (206) 591-1096 to talk through your project before committing to anything.

A 400-600 SF detached ADU in Longview — one bed, one bath, small kitchen, GE or Whirlpool appliances — typically runs $120,000-$175,000 all-in, including permits, engineering, foundation, framing, MEP, and finishes. Attached garage or basement conversions usually land between $60,000-$110,000. Site-specific factors that shift the number: slope, Cowlitz Valley clay soil conditions, utility line distances, and whether Pacific Power requires a new service drop. TopVolk provides a written line-item quote after the site visit — a real number, not a range. Call (206) 591-1096 to schedule the free consultation.

In-city Longview lots go through the City of Longview Building Division; unincorporated Cowlitz County parcels use the county's own building department — two different counters, slightly different timelines and fee schedules. Either way, a DADU permit requires a site plan, architectural drawings with dimensioned setbacks, energy code compliance documentation, and typically a structural engineering stamp. Plan review in Longview runs approximately 6-10 weeks for a new structure. After permit issuance, budget for framing inspection, rough-in inspection, insulation inspection, and final inspection milestones before the certificate of occupancy issues. TopVolk is a WA Licensed Contractor and prepares the complete permit submittal package for every ADU project — you don't have to learn the portal.

Yes — and in Longview's 1920s-1940s housing stock, the detached garages behind Lake Sacajawea-area craftsman homes are often the most practical and cost-effective ADU path. The existing foundation and roof structure eliminate a significant portion of new construction cost. Basement conversions require egress window installation per IRC minimum opening requirements, moisture management with DriCore subfloor panels, and a headroom assessment — some older Longview basements run under 7 feet, which affects both livability and permit compliance. Every garage and basement conversion is scoped with a full MEP (mechanical, electrical, plumbing) plan, not just framing and drywall.

A DADU shell — framing, sheathing, roofing, windows, and Hardie siding — typically goes up in 6-8 weeks after permits are in hand. MEP rough-in follows, then the rough-in inspection, insulation, and drywall hang, tape, and mud. A 400-500 SF detached ADU generally reaches substantial completion in 12-16 weeks of active construction. Attached conversions run shorter, usually 8-12 weeks depending on the scope of structural work. TopVolk writes specific construction milestone dates into the contract, with financial penalties for missed deadlines paid to you — that's a binding commitment, not a general assurance about how seriously the schedule is taken.

Yes — Cowlitz County as a whole, including Kelso (98626), Castle Rock (98611), and surrounding unincorporated areas, falls within the service area for ADU and larger remodel projects. Vladislav works directly with every client on every project; there's no project coordinator layer between you and the owner when scheduling decisions or scope questions come up. Permit jurisdiction varies by parcel — some lots go through city building departments, others through Cowlitz County — but the permit prep process TopVolk handles is the same regardless of which counter the application goes to. Call (206) 591-1096 to discuss your specific lot and project.