Sliding and Patio Door Replacement in Bellevue, WA

Which Patio Door Do You Have?

Most patio door replacement on the Eastside falls into three types. Knowing which one you have makes the first conversation shorter and the quote more accurate.

Sliding: One panel stays fixed and the other glides along a track. This is the common choice where floor space beside the door is limited, such as a deck off a kitchen or a condo balcony.

French: Two hinged panels that meet in the middle, usually opening inward. They give a wide, unobstructed opening and suit rooms with space to swing the doors.

Hinged single or double: A conventional swing door with a large glass panel, sometimes with a fixed side panel beside it. It seals differently from a slider and has no track to clean.

Some openings take a different type from the one being removed. A tired slider can become a French door, and the other way round, but that choice can change the frame, the threshold and the trim, so it is worth raising at the start. Tell the person arranging your survey which type you have and which type you would like instead.

Frames and Glass Options

A door replacement quote should say what the frame is made of and what the glass is. Those two lines drive much of the quote.

Frame material: Vinyl, fiberglass and wood or clad-wood all appear in patio doors. The same trade-offs apply as with windows, so the pages on vinyl windows, fiberglass windows and wood and clad windows are a useful starting point. Larger panels put more stress on a frame, so rigidity matters more on a wide opening than on a small window.

Glass: Ask whether the glass is double-pane or triple-pane, whether it carries a low-emissivity coating, and what gas fill is used between the panes. Ask for the NFRC U-factor and for the limit your city's permit office applies. Do not assume that a larger number or a thicker unit is better without seeing the NFRC label.

Safety glazing: Glass in and beside doors is generally required to be safety glass. Ask which glass is specified so the quote and the order match.

Track, Threshold and Moisture Points

The bottom of a patio door is where most problems start, so it deserves its own check.

• Threshold and sill: Ask how the sill will be sealed and flashed to shed water away from the framing. A door that looks tight on installation day can still let water into the wall beneath it later.
• Track drainage: A sliding door track normally has small weep channels that let rain escape. Keep them clear of debris after installation.
• Subfloor and framing: Once the old door is out, the framing and floor beneath it can be seen for the first time. Ask what happens if rot or damage turns up, and who decides and who prices the repair. Do not accept an open-ended "we'll see."
• Threshold height: If step-free access matters to anyone in the household, say so at the survey. It affects which threshold styles are possible.
• Insect panel: If you use one, ask whether it is part of the door or sold separately.

What Moves the Price

This page gives no figures. A number stated here could miss your door by a wide margin, so the factors are listed instead. The cost guide, window replacement cost, explains how to read a quote and where estimates come from.

• Size and number of panels: Wider openings and three- or four-panel layouts cost more than a standard two-panel door.
• Type: French and hinged doors, a slider and a multi-slide system all price differently.
• Frame material: Vinyl, fiberglass and wood or clad-wood sit at different levels, and larger frames amplify the gap.
• Glass: Double-pane versus triple-pane, coatings, tints, decorative or privacy glass, and safety glass requirements.
• Structural change: Widening the opening, adding a header, or changing the type of door can add framing work and may bring a permit into the picture.
• Access and finishing: Second-story decks, tight access, interior and exterior trim, painting, and removal of the old door.
• Condition behind the old door: Damaged sill or framing is found only once the door is out.

Ask for a written quote that lists each of these separately, so you can compare two quotes line by line.

Permits and Condo or HOA Rules

In Bellevue, replacing a window with one of the same size and no structural change is generally exempt; changing the opening needs a permit. Confirm with Bellevue Development Services before work starts. Doors are different enough from windows that you should ask the same question about your specific opening, especially if it will be widened or moved. Other cities on the Eastside run their own permit offices, so check with yours.

If you live in a condo or a managed community, the rules for exterior doors may sit with your association, not just the city. Check your community's CC&Rs and architectural review before ordering. Our guide on permits and HOA rules covers the basics.

General information, not advice.

Repair or Replace

A patio door is worth repairing when the frame is sound and the problem is a part: a worn roller, a bent track, a tired seal or a loose lock. It is worth replacing when the frame itself is damaged, when moisture has reached the framing, when glass units have failed in several panels, or when the door no longer closes square.

Ask any quote to say what is wrong, what is being fixed and why replacement is or is not the better option. Our page on is it worth replacing walks through the same decision for windows.

Related Pages

Compare materials on vinyl windows and fiberglass windows, read insert or full-frame for how a new unit is fitted, or see service areas such as Kirkland, Redmond and Mercer Island. The all services page lists everything we arrange.