Sill Plate Replacement Cost
Tacoma WA
Sill plate replacement cost in Tacoma ranges from $7,500 for partial single-run replacement up to $12,000 or more for full perimeter replacement with concurrent rim joist work. Two recent reference points: a sill plate replacement in Aberdeen at $7,500 and a full perimeter job in Old Town Tacoma at $12,000. This guide shows what drives the final number and where your project is likely to land.
- Real recent Tacoma/South Sound job data
- What drives pricing tier-by-tier
- Shoring scope included in fixed-price bid
- 5-year written structural guarantee
- Aberdeen job: $7,500 (single run)
- Old Town Tacoma: $12,000 (full perimeter)
- Includes temporary shoring scope
- Pressure-treated replacement material
$350 diagnostic credits 100% toward your repair.
Sill Plate Replacement Cost in Tacoma, WA — Direct Answer
Sill plate replacement cost depends on linear feet of decayed plate, whether shoring is required, and whether the rim joist and anchor bolts also need replacement. Realty Repair Co. (APCON LLC, Washington General Contractor #APCONL*825QO) performs this work directly as the general contractor in Tacoma, Washington. Scope is confirmed on site with moisture meters and physical probing before any price is issued; the resulting repair contract is lump-sum fixed price, not hourly, and structural repairs carry a five-year written guarantee.
- Work performed
- cost drivers, shoring requirements, fixed-price proposal
- How it starts
- $350 forensic structural report — on-site, written, photographed. Credited 100% against the repair contract if you proceed.
- Pricing method
- Lump-sum fixed price issued after the failure boundary is confirmed. No hourly billing. No open-ended scope.
- Guarantee
- Five-year written guarantee on structural repairs.
- Licensing
- WA General Contractor #APCONL*825QO, bonded and insured. Work performed under the 2021 Washington State Residential Code (WAC 51-51, effective March 15, 2024).
- Not offered
- Crawl space encapsulation, waterproofing, basement finishing, painting, pressure washing, landscaping. Plumbing, electrical and mechanical are coordinated through separately licensed contractors per RCW 18.27.
- Contact
- 253-891-9622 · dispatch@realtyrepairco.com · 711 115th St S, Tacoma, WA 98444
Reviewed by Dindar Nasim, owner and Washington licensed general contractor (#APCONL*825QO) · Updated September 28, 2026
Sill Plate Replacement Cost Tacoma —
Understanding the Scope
The sill plate is a bearing member. It sits on top of the foundation and carries the weight of the framing above. When it rots, it doesn't just need repair — it needs full excision, temporary shoring of the load, replacement with pressure-treated lumber, restoration of the sill seal and moisture barrier, and correction of the moisture source that caused the rot to start. All of that scope drives the price, and scope depth is why phone estimates on sill plate work are unreliable.
License Note: Sill plate replacement is performed directly by APCON LLC under GC License #APCONL*825QO. Where the work exposes plumbing or electrical systems requiring licensed trade coordination, those scopes are GC-coordinated under RCW 18.106 and RCW 19.28 respectively.
Partial. Corner. Full Perimeter.
Pick Your Tier.
Sill plate replacement pricing falls into three scope tiers based on how much of the perimeter needs to come out and whether rim joist replacement runs concurrent. Each tier below includes the real Tacoma range and what drives the price inside it.
Single Run: $7,500–$8,500
Partial sill replacement on one run of the perimeter. Rot is localized, adjacent sections test sound. Includes shoring scope and sill seal restoration. Our $7,500 Aberdeen job fell in this tier.
Corner + Adjacent: $9,000–$10,500
Replacement spans a corner with adjacent runs on both sides. Common when water tracked along two perimeter walls. Includes specialized corner shoring and moisture barrier re-tie at the connection.
Full Perimeter + Rim: $11,000–$12,000+
Full foundation perimeter sill replacement with concurrent rim joist scope. Our $12,000 Old Town Tacoma job fell in this tier. This is the scope for older homes with system-wide moisture issues.
Mandatory Scope
Every tier includes: full rot excision to sound fiber, pressure-treated sill material, sill seal replacement, anchor bolt retie where compromised, and root-cause moisture correction to protect the 5-year guarantee.
Five Variables That
Move the Final Number
Within each tier, five variables shift the final bid. Knowing these helps you evaluate any competing contractor bid you receive for comparison.
1. Perimeter Linear Footage
Linear footage of sill replacement is the base driver. Partial jobs run 8–20 linear feet. Corner jobs run 20–40 feet. Full perimeter on a typical Tacoma home runs 120–180 feet.
2. Crawl Space Access Height
Tight crawl spaces under 24” of clearance slow the work considerably. Some older Tacoma homes have crawl heights that require specialized low-profile tooling and extended labor hours.
3. Shoring Point Count
Shoring points are determined by bearing-wall layout, span, and load paths. A typical partial replacement needs 2–4 shoring points. Full perimeter work can require 12–20 depending on framing design.
4. Rim Joist Concurrent Scope
If the diagnostic finds rim joist rot, scope expands to include rim replacement concurrent with sill replacement. This is common and often necessary for the repair to hold.
5. Moisture Source Correction
Regrading, flashing, gutter correction, or vapor barrier installation — whatever the moisture source is, correcting it is mandatory. Scope varies but is always in the bid.
6. Exterior Finish Restoration
Where sill replacement requires siding removal and replacement, finish match scope is priced into the bid. Painted composite siding is straightforward. Custom cedar or lap profiles add cost.
Sill Plate Service Pages
Related to This Cost Guide
These service pages cover the underlying scope in more detail. All pricing routes through the $350 forensic diagnostic.
Primary Service Page
Mudsill & Sill Plate Replacement Tacoma — the main sill plate service page covering methodology, material spec, shoring approach, and the structural rebuild sequence.
Related Structural Pages
Other Cost Guides
Sill Plate Replacement Cost Tacoma FAQ
Ready for an Accurate
Sill Plate Replacement Quote?
The $350 diagnostic maps the full sill plate scope, probe-tests adjacent runs, counts shoring points, and produces a lump-sum fixed-price bid. If you proceed, the fee credits 100% to the project.
Book a $350 Sill Plate Diagnostic 📞 Call Direct