Threshold ramp installation cost Seattle

Quick Answer

Threshold ramp installation in Seattle costs $100–$600 per location for prefabricated or custom-built ramps at interior and exterior doorways. Longer exterior ramps meeting ADA slope requirements (1:12 ratio) cost $1,500–$6,000 depending on rise, material, and complexity. Threshold ramps are one of the lowest-cost, highest-impact modifications for wheelchair users, walker users, and anyone with limited step clearance.

Detailed Explanation

A threshold is any raised surface that must be crossed to move from one area to another — an exterior door saddle, the edge of a shower, a height change between flooring materials, or the lip at a sliding glass door. For most adults, these are minor inconveniences. For someone using a wheelchair, walker, or rollator, or for anyone with balance or gait issues, they become genuine obstacles and fall risks.

Seattle's housing stock creates a specific version of this problem: older homes often have exterior entry thresholds that are 1.5–3 inches tall (designed to keep Pacific Northwest rain out), sliding door tracks that protrude above the floor surface, and height mismatches between interior flooring materials that accumulated over decades of piecemeal updating. These aren't design failures in the original sense — they were reasonable decisions for their era — but they require deliberate remediation for aging in place.

The standard for accessible thresholds is ½ inch or less, with the preferred condition being a flush transition. A ½ inch change in floor level is acceptable if the edge is beveled at a 1:2 slope. Anything taller than ½ inch must be ramped at no greater than 1:2 slope for interior transitions, or 1:12 slope for exterior ramps used by wheelchair users. Understanding this hierarchy helps prioritize which thresholds require a full ramp solution versus a simpler modification.

Threshold ramps are often the first modification families install — they're fast, relatively inexpensive, and produce an immediate visible improvement in accessibility. They're also not a permanent fix for the underlying problem. Where possible, the better long-term solution is to adjust the subfloor or transition to eliminate the height change, rather than ramp over it permanently.

What to Expect

Prefabricated Rubber or Aluminum Threshold Ramp: $50–$200 in materials, plus $100–$250 for professional installation and securing. These modular ramps are available in heights from ½ inch to 5 inches and are secured with adhesive or mechanical fasteners. Good solution for interior doorways and modest exterior thresholds. Not appropriate for rises over 5 inches.

Custom Wood or Composite Threshold Ramp (Interior): $300–$600 installed for a custom-built ramp built and finished to match existing flooring and trim. Looks intentional rather than retrofitted. Appropriate for interior thresholds where aesthetics matter.

Exterior Entry Ramp — Short (6–12 inch rise): $1,500–$3,500 for a short exterior ramp in pressure-treated wood, composite decking, or concrete, with handrails on both sides and non-slip surface treatment. Seattle's wet climate requires material selection with corrosion-resistant hardware and proper drainage slope to prevent standing water.

Exterior Entry Ramp — Long (12–24 inch rise): $3,500–$7,500+ for a switchback or extended ramp with appropriate 1:12 slope, landing platforms, compliant handrails at 34–38 inches, and weather-resistant surface. Longer ramps may require a building permit through Seattle DCI.

Sliding Door Track Modification: $300–$700 to address raised sliding door tracks by flush-mounting the track, building a custom transition ramp, or replacing the sliding door assembly with a zero-threshold product. The right solution depends on door type and floor construction.

Shower Threshold Ramp: $200–$500 for a custom teak, aluminum, or composite ramp fitted to an existing shower curb. A better long-term solution is a curbless shower conversion, but threshold ramps are a practical interim measure.

Permits: Simple threshold ramp installations do not require permits. Exterior ramps attached to the structure and over a certain height threshold may require a building permit in Seattle — confirm with Seattle DCI or your contractor before beginning work.

Overall Timeline: Prefabricated ramp installation is typically same-day. Custom-built ramps take 2–5 days. Exterior ramps requiring permits may take 3–6 weeks including permit approval.

Need Help?

Crest & Level handles threshold modifications and ramp installation throughout Seattle — from simple interior transitions to fully finished exterior entry ramps with compliant handrails. We can evaluate which of your thresholds represent the highest risk and recommend the most durable, well-finished solution for each. Reach out to get started.