# Foundation Repair Des Moines WA | Seattle Foundation Repair > Foundation repair, crawl space work, and drainage in Des Moines WA. Post-war shoreline homes and south King County lots evaluated with documented surveys. URL: https://foundationrepairseattle.net/service-areas/des-moines/ ![](/images/misc/foundation-crew-working-beside-an-older-pacific-no.webp) Serving Des Moines and the surrounding area # Foundation Repair & Evaluation in Des Moines Des Moines sits on the Puget Sound shoreline in south King County where post-war crawl-space homes, bluff-edge lots, and marine drainage shape most of the foundation work we evaluate here. We assess and repair foundations across Marine Hills, Zenith, Saltwater, and the Kent-Des Moines corridor with documented measurements and coordinated scopes. Free preliminary project review Written scope with clear exclusions Reviewed through King County Areas covered Zenith Marine Hills Saltwater Kent-Des Moines Des Moines Beach Last updated: September 20, 2026 Request a Foundation Repair Quote [/request-quote/ →](/request-quote/) Book an evaluation [/foundation-evaluation/ →](/foundation-evaluation/) Free Preliminary Project Review Tell us what you're noticing before you commit to anything. Laser Manometer Elevation Survey Multi-point measurements record exact floor differentials. Written Scope With Exclusions Quantities, depths, and permit notes stated in writing. Registered Washington Contractor Registration and bond are verifiable through L&I Verify. Common concerns ## Foundation Warning Signs Worth a Second Look Most people reach out because something has changed and they cannot tell how serious it is. That is a reasonable place to start. ### Cracks you cannot read A diagonal line above a door frame or a stair-step crack in block work means something. Width alone does not tell you what. We measure the pattern and the movement before calling it anything. ### Floors that have gone out of level Sloping floors, doors that bind in one season, a gap opening where a wall meets the ceiling. These often trace to crawl space framing rather than the perimeter foundation, and the fix differs completely. ### Water arriving every wet season Puget Sound rain is sustained rather than dramatic, which is why basements leak in January and stay dry in July. Whether you need drainage or waterproofing depends on how the water is getting in. ### Quotes you cannot compare Two proposals, two numbers, no shared language. We itemise quantities, depths, and exclusions so you can see what each line is actually paying for and where the two differ. Available here ## Our Foundation Repair Services in Des Moines Des Moines sits on the Puget Sound shoreline in south King County where post-war crawl-space homes, bluff-edge lots, and marine drainage shape most of the foundation work we evaluate here. We assess and repair foundations across Marine Hills, Zenith, Saltwater, and the Kent-Des Moines corridor with documented measurements and coordinated scopes. ![Excavated pit at a Seattle house footing with a steel push pier bracket positioned against the concrete](/images/misc/excavated-pit-at-a-seattle-house-footing-with-a-st.webp) ### Foundation Repair Support and stabilization for settling foundations, matched to assessed conditions and approved scope. Read more [Foundation Repair →](/foundation-repair/) ![Foundation anchor bolt and steel retrofit plate fastened through a sill plate on a Seattle home stem wall](/images/misc/foundation-anchor-bolt-and-steel-retrofit-plate-fa.webp) ### Seismic Retrofit Foundation anchorage, sill connections, and cripple wall bracing that strengthen a home's load path. Read more [Seismic Retrofit →](/seismic-retrofit/) ![Adjustable steel support post carrying a wood girder above a new concrete footing pad in a Seattle crawl space](/images/misc/adjustable-steel-support-post-carrying-a-wood-gird.webp) ### Crawl Space Repair Repair for failing posts, beams, joists, and sills that cause sagging or bouncy floors. Read more [Crawl Space Repair →](/crawl-space-repair/) ![Seattle Foundation Repair: horizontal crack across a poured concrete basement wall with string-line deflection measurement](/images/misc/horizontal-crack-running-across-a-poured-concrete-.webp) ### Basement Walls Reinforcement and stabilization for cracked, bowing, or moving basement walls. Read more [Basement Walls →](/basement-wall-repair/) ![Interior perimeter drain trench along a Seattle basement floor edge with perforated pipe bedded in gravel](/images/misc/interior-perimeter-drain-trench-cut-along-a-baseme.webp) ### Waterproofing Water-entry assessment with collection, drainage, and discharge systems. Read more [Waterproofing →](/basement-waterproofing/) ![Seattle Foundation Repair encapsulated crawl space with reinforced liner covering the ground and foundation walls](/images/misc/encapsulated-crawl-space-with-a-clean-reinforced-l.webp) ### Moisture Control Vapor barriers, encapsulation, drainage, and humidity management where appropriate. Read more [Moisture Control →](/crawl-space-moisture-control/) Start with an evaluation [/foundation-evaluation/ →](/foundation-evaluation/) The process ## How an Evaluation Works Four steps from the first message to a decision you can actually make. Nothing is committed until you have the written scope in front of you. 1. Step 01 ### Tell us what you see Send the observations, photos, and rough timeline through the quote form. We'll tell you what an evaluation would examine and what it cannot establish from a photo. 2. Step 02 ### On-site evaluation We record accessible observations and take multi-point laser manometer elevation readings, so floor differentials are measured rather than estimated by eye. 3. Step 03 ### Findings and limits explained You get a plain explanation of what the findings do and do not indicate, including the limits of a visual assessment and whether an engineer should be involved. 4. Step 04 ### Written scope and next step If repair is warranted, the proposal states quantities, depths, permit notes, and explicit exclusions. If it is not, we say that too. ## Need a foundation opinion in Des Moines? Send the observations and the address. We'll confirm coverage, the applicable permitting authority, and what an evaluation would examine. Request a Quote [/request-quote/ →](/request-quote/) How evaluations work [/foundation-evaluation/ →](/foundation-evaluation/) Local difference ## Why Des Moines Homeowners Work With Us Crawl-space substructure audits mapping posts, girders, joists, and sill anchorage Moisture source corrected alongside framing repair so decay does not return Seismic retrofit scope explained as separate work from settlement repair Correct permitting authority confirmed: City of Des Moines or King County Documented laser manometer elevation surveys, not a single spot check Coverage across Zenith, Marine Hills, Saltwater, Des Moines Beach, and the Kent-Des Moines corridor Customer experience ## What Des Moines Customers Say > The evaluation was calm and thorough. They explained which cracks were cosmetic and which were load-bearing, and gave us a written scope with clear exclusions before any work. Homeowner, Queen Anne Queen Anne, WA > Our floors had started to slope near the kitchen. They audited the crawl space, showed us the failing posts, and fixed the moisture source too, not just the framing. Homeowner, Ballard Ballard, WA Illustrative summaries of the service experience. They are not verified Google reviews and carry no star ratings. Real reviews replace them once our Google Business Profile is connected. Local knowledge ## South King County Permitting and Site Access Foundation work in Des Moines may route through the City of Des Moines building department or King County Development Services depending on the specific parcel. Confirming which authority reviews your property is part of scoping a project here rather than an assumption made after quoting. Submittal requirements and review timelines differ, and establishing that at the start keeps the schedule honest. Access across most Des Moines lots is generally workable. Inland parcels along the flat upland have conventional equipment access and staging. Bluff-facing lots above Saltwater State Park and the marina corridor can have steeper grades and limited turnaround for larger equipment, and we assess those constraints during the evaluation and note them in the written scope before work begins. Crews reach Des Moines via SR-509 and SR-99 as part of our regular south King County coverage. We schedule work alongside Burien, Kent, and Federal Way rather than treating the area as a separate block with uncertain arrival windows. ## Post-War and Mid-Century Homes on the Shoreline The dominant housing type in Des Moines is post-war and mid-century construction from the 1950s through the early 1980s. That era means conventional crawl spaces on post-and-pier supports, perimeter stem walls, and sill plates that were commonly built without anchorage to the foundation. On these homes we most often record settled post bases, undersized or moisture-damaged girders, and cripple walls that were never braced. The marine climate and proximity to the Sound make moisture a persistent crawl-space consideration. Where the terrain drops toward the bluff, drainage routing and soil saturation can keep crawl spaces wetter than inland properties of the same vintage. Decay in framing that was never braced or sealed against moisture is a slow process, but it produces the same symptoms as settlement: floors that bounce at mid-span, doors that bind, and visible sag in the floor plane. Newer construction in the area sits on engineered footings and presents different findings, but drainage and flatwork settlement still appear on these lots as downspouts route water toward foundations and driveways settle over years of wet cycles. ![Older Pacific Northwest residential street of timber-frame homes on a gentle slope](/images/misc/older-pacific-northwest-residential-street-of-timb.webp) Neighbourhoods covered Zenith Marine Hills Saltwater Kent-Des Moines Des Moines Beach Permitting authority King County Requirements differ between jurisdictions. We confirm which applies to your parcel before quoting rather than assuming Seattle rules carry over. Landmarks & access Near **Des Moines Marina**, **Des Moines Beach Park**, **Saltwater State Park**. Via SR-509 (Marine View Drive), SR-99 (Pacific Highway S) Transit: King County Metro bus connections along Pacific Highway S Map showing the general Des Moines area we serve. It is not a site assessment and it does not indicate risk at any specific address. Local questions ## Des Moines Questions My Des Moines property is on a bluff lot above the Sound. Does that mean extra permitting? Possibly. Lots with steep slopes or proximity to the shoreline can trigger additional review requirements, including geotechnical documentation in some cases. We check the parcel before quoting so the review path in your scope reflects the real permit process rather than an optimistic one. Which Des Moines areas do you cover? Zenith, Marine Hills, Saltwater, Des Moines Beach, and the Kent-Des Moines corridor along Pacific Highway S, plus adjacent streets toward Burien and Federal Way. If you are near a boundary, ask and we will tell you plainly whether we serve your address. My post-war Des Moines home has sloping floors. Is that a foundation problem? In most homes of this era, a sloping or bouncy floor traces to the crawl-space framing rather than the perimeter foundation. Settled post bases, an undersized girder, or moisture-damaged joists all produce that symptom. An evaluation maps the substructure with elevation readings so the repair targets the actual cause. Is my older home's sill plate bolted to the foundation? Many homes of the 1950s through 1980s were built without anchorage, but not all, and some have been retrofitted since. We check the actual connections in the crawl space rather than assuming from build year. Do you offer seismic retrofit in Des Moines? Yes, where the building is suited to it. Eligibility for a prescriptive approach depends on foundation condition, configuration, and access. We check the applicable requirements before recommending a scope and never promise a home will survive a specific earthquake. How do I get started? Tell us what you are noticing through the quote form. The preliminary project review is free, and we explain any on-site evaluation charge before an appointment is booked. ### Still have a question? Send us what you're noticing and we'll tell you plainly what it might mean and what an evaluation would examine. Ask us about your property [/request-quote/ →](/request-quote/) Nearby coverage ## Areas We Also Serve Near Des Moines ### Burien Seattle Foundation Repair serves Burien homeowners dealing with foundation settlement, crawl space damage, and seasonal drainage on the city's west-facing slopes toward Puget Sound. Post-war homes built in the 1950s and 1960s near Seahurst, Three Tree Point, Gregory Heights, and Boulevard Park commonly show settling in crawl space framing and moisture intrusion where slopes meet the bluff. We evaluate each property with multi-point laser manometer readings and document bearing soil, drainage paths, and structural framing before recommending any repair scope. Available services in Burien include helical pier underpinning, crawl space encapsulation, basement waterproofing, concrete leveling, and retaining wall stabilization. View Burien [Burien →](/service-areas/burien/) ### Kent Kent's Green River valley floor - spanning zip codes 98030, 98031, and 98042 - carries soft alluvial soils and a high seasonal water table. Single-family homes across Panther Lake, Meridian, and Downtown Kent each face distinct bearing and moisture conditions. Whether you are searching for foundation repair near you on the valley floor or up on the hillside, we evaluate each property individually before recommending a method. View Kent [Kent →](/service-areas/kent/) ### Federal Way Federal Way's later housing stock and rolling terrain bring drainage routing, crawl-space moisture, and flatwork settlement as the most common findings. View Federal Way [Federal Way →](/service-areas/federal-way/) See all service areas [/service-areas/ →](/service-areas/) ![](/images/misc/foundation-technician-standing-beside-an-excavated.webp) Next step ## Foundation concerns in Des Moines? Free preliminary project review. Free preliminary project review on every enquiry, with the evaluation charge explained before anything is booked. Request a Foundation Repair Quote [/request-quote/ →](/request-quote/) Other ways to reach us [/contact/ →](/contact/) Free preliminary project review. Any charge for an on-site evaluation is explained before booking.