Permeable resin-bound surfacing can work as permeable pavement in Bellevue when it is one layer of an engineered section: a resin-bound wearing course over a permeable base such as Rock Crete and an open-graded stone reservoir, on soil that passes the city's infiltration feasibility steps, or with an underdrain the engineer designs. Laid over an existing concrete driveway, rain passes the top layer but still runs off the slab, so it is a finish, not a stormwater facility.

Bellevue Utilities applies the Department of Ecology manual through its own Storm and Surface Water Engineering Standards, updated January 2026. Those standards carry an approved-materials list for permeable pavement wearing courses, and a poured resin-bound surface isn't on it, so plan on asking the Utility for prior approval.

How Bellevue Utilities treats permeable pavement in the 2026 standards

The engineering standards set Bellevue's minimum requirements for storm and surface water design in line with Ecology's Stormwater Management Manual for Western Washington, where permeable pavement is an on-site stormwater management practice. Low impact development is the preferred approach, and permeable pavement sits alongside bioretention and dispersion as a way to manage hard surfaces where rain falls.

Two details shape a resin-bound proposal. The standards count permeable pavement as hard surface when working out which minimum requirements a project triggers, so a permeable patio still adds to your new-plus-replaced total. And Appendix D-6, the approved materials list, names specific paver and grid products as permeable pavement wearing courses, with other manufacturers needing the Utility's prior approval. Expect a written request backed by product data and the engineer's section.

The Land Use Code has its own permeable pavement thresholds for impervious-surface limits, which the standards say can differ from utility code purposes. Treat zoning and stormwater as two separate checks.

Till, the Infiltration Potential Map and wet-season testing

Bellevue's infiltration feasibility process starts with the city's Infiltration Potential Map. Where the map doesn't rule a site out, the standards call for a geotechnical or soils report and field testing, scheduled in the December to March wet season whenever possible. For permeable pavement, the bottom of the base course needs at least 1 foot of separation from the seasonal high water mark, hardpan or another low-permeability layer.

Much of the Eastside sits on dense glacial till, and the standards' own site-planning advice is to put hard surfaces over till and save more porous soils for bioretention or permeable pavement. On a till lot the project engineer may specify an underdrain or a detention-style section; the resin-bound surface still drains freely, while the base and outlet do the stormwater work. Steep slopes and landslide hazard areas under the critical areas code add setbacks and can rule infiltration out entirely.

Where resin-bound fits on Bellevue sites

Single-family rebuilds. The standards' own worked example of a house redevelopment includes a new permeable pavement patio. Resin-bound patios and paths fit that pattern where testing supports infiltration.
Downtown and BelRed courtyards. Plazas in the newer mixed-use blocks can use resin-bound as a finish. Over a podium slab it drains to the building system and is not a stormwater facility.
Office campuses in Eastgate and Factoria. Pedestrian walks and outdoor seating areas with light loads.
Lakefront homes on Lake Washington and Lake Sammamish. Terraces and paths, subject to shoreline rules and whatever the geotechnical report says about groundwater.
School grounds. Walkways and outdoor classrooms, with a maintenance plan for leaf litter from mature Eastside trees.

Getting a resin-bound section reviewed by Bellevue Utilities

Bellevue Utilities reviews storm drainage on building and utility permits, and some permits require a storm drainage report. The city's report checklist asks for infiltration testing for proposed permeable pavers so the Utilities reviewer can decide whether the site is infiltration feasible. Expect the same for a resin-bound wearing course, plus the prior-approval question, and raise both at pre-application.

Resin Rock supplies the system: UV-stable resin binder, natural stone aggregate blends, trims and Rock Crete permeable sub-base. Our technical data sheets give your engineer product information to attach to an approval request. We don't install. We train and approve installers and can match you with an approved installer, usually within 24 hours, and Washington contractors can join our installer training.

Before you specify permeable resin-bound in Bellevue

Check the parcel on Bellevue's Infiltration Potential Map.
Book soils and infiltration testing for December to March if you can.
Confirm at least 1 foot of separation below the base course.
Ask Bellevue Utilities about prior approval for a wearing course not in Appendix D-6.
Count the permeable area as hard surface when checking minimum requirements.
Check Land Use Code impervious-surface limits separately.

Common questions about permeable resin-bound in Bellevue

Does a resin-bound patio count as pervious in Bellevue?

Not for stormwater thresholds. Bellevue's 2026 engineering standards treat permeable pavement as hard surface when deciding which minimum requirements apply. A properly designed permeable section can still serve as an on-site stormwater practice if the Utility accepts it. The Land Use Code handles permeable pavement separately for impervious-surface limits, so ask the land use reviewer as well.

Can I lay resin-bound over my existing concrete driveway?

Yes, as a resurfacing. Rain passes through the resin-bound layer and then runs off the slab underneath, so for stormwater purposes the driveway behaves like any other hard surface and shouldn't be counted as a facility. To act as permeable pavement, the slab comes out and an engineered permeable base goes in over soil or an underdrain that can take the water.

My lot is on till. Is permeable resin-bound still worth it?

It can be, but its stormwater role changes. If testing shows slow soils, the engineer may add an underdrain or detention layer, or manage runoff elsewhere on the lot. The surface still drains freely and avoids puddles. Whether any of it counts toward your requirements is the Utilities reviewer's decision, not something the material settles.

Official sources for Bellevue

Local rules change. We last checked these sources in October 2026. Confirm current requirements with the reviewing agency before you design, and treat this page as a starting point, not engineering or permitting advice.

Permeable Resin-Bound Surfacing in Bellevue, WA