Retrofit or Full Frame, and How to Tell Which One Your Riverside House Needs

Published August 27, 2026

Almost every window quote in this city is really an answer to one question, and most homeowners never get told the question was asked. Does the new window go inside the frame that is already in the wall, or does the frame come out too.

That is the retrofit versus full frame decision. It changes the price by roughly double, it changes the job from one day to several, and it is decided by the condition of your openings rather than by which package a salesperson is pushing that month. Here is how we make the call, so you can make it yourself before anyone comes out.

Two Different Jobs Wearing the Same Name

A retrofit window, sometimes called an insert or a flush fin window, is a complete window unit with a flange around the outside that laps onto the face of your existing frame. The old sash and glass come out. The old frame stays put. The new unit is shimmed square inside it, sealed, and the flange covers the joint.

Nothing gets cut. Your stucco is untouched. The interior casing and drywall return never move. On a house where the existing openings are sound, that is not a compromise, it is simply the sensible way to do it.

A full frame replacement removes everything: sash, glass, frame, the nailing fin the frame was fastened with, and the stucco return that laps over that fin. What is left is bare rough framing. The opening gets repaired if it needs it, flashed from scratch, the new window set on its fin, and then lath, brown coat, colour coat and a texture match to bring the wall back.

One of those is a window job. The other is a window job with a small stucco job attached. Both are legitimate. The mistake is assuming the expensive one is the good one.

The Five Checks

Anyone can do these. You need a tape measure, a screwdriver and about three minutes per window.

Is the opening square

Measure the existing frame diagonally, corner to corner, both ways. If the two numbers are within a quarter of an inch of each other, the opening is square enough for a retrofit unit to sit properly in it.

If they are off by more, something has moved. On slab-on-grade tract houses out through Orangecrest and Mission Grove that usually means settlement has dropped one corner of the opening. You can still force a retrofit into a racked opening with enough shims, and plenty of people do, but the sash will bind and the weatherstrip will be under permanent uneven load. That opening wants full frame.

Is the sill solid

Press a screwdriver firmly into the wood sill at both bottom corners, which is where water sits longest. It should feel like pushing into a board. If it sinks, if it feels spongy, if the tip goes in a quarter of an inch with hand pressure, the framing has already taken water and gone soft.

A new window fastened to soft wood has nothing to hold. This one is not a judgement call.

What does the stucco return look like

The stucco return is the finished edge of stucco that wraps into the window opening. Look for cracks running out from the corners, sections that sound hollow when you tap them, and anywhere the stucco has pulled away from the frame leaving a gap that has been filled with caulk more than once.

A retrofit flange has to seal against a flat, sound surface. If the return has failed there is nothing to seal against, and no quantity of sealant fixes that for longer than a season or two.

Is there staining inside

Look at the interior casing directly under the sill, and at the drywall in the bottom corners. Water that has been getting past the flashing shows up as staining, bubbling or peeling paint, chalky white deposits, or drywall paper that has lifted.

This is the check people most want to talk themselves out of, because the stain is old and the leak is not currently happening. It does not matter. The flashing behind that fin has failed, and a retrofit window put in over the top of it seals the evidence away without touching the cause.

What is the frame made of and what shape is it in

Aluminium frames from the seventies and eighties are extremely common here and most of them are still structurally fine. Corroded corners where the sections meet, or a frame that flexes when you push on it, are different. So is a wood frame that has been painted so many times the sash has not opened since the Clinton administration.

What Each One Costs and Why

Per opening, retrofit work in Riverside typically lands somewhere between four hundred and nine hundred dollars depending on size, glass package and whether it operates. Full frame is roughly double that, call it nine hundred to eighteen hundred, and on a large or unusual opening it can be more.

The gap is not markup. Full frame is one to two extra hours of demolition per opening, framing repair where it is needed, a proper flashing sequence, and then a stucco trade coming back for lath, brown coat, colour coat and texture. Stucco has cure times that no amount of scheduling makes shorter.

Which is exactly why it is worth knowing which one you need. If your house takes retrofits and someone quotes you full frame across the board, you are paying for demolition and stucco repair you do not need. If your house genuinely needs full frame on two openings and you are quoted retrofit throughout, you are buying a cover up on those two, and it will surface in three to five years.

Most Houses Are Mixed

The single most useful thing to know is that this is not a whole house decision. It is a per opening decision.

The pattern we see constantly on a Riverside single family home is nine or ten openings that are clean retrofits and one or two that are not. The exceptions are almost always on the west and south elevations, because that is where the sun has been cooking the sealant and the paint for forty years, and where the wind driven rain we do get comes from.

So the quote should be itemised. Retrofit here, full frame at these two, and the reason written next to each. If a quote gives you one number for a whole house and does not name the method, that is the thing to ask about before anything else.

The Riverside Specifics That Change the Answer

Heat and the west elevation. Summer here is long, dry and genuinely hot, and afternoon sun on the west side of a house is the dominant load on your air conditioning. That is a glass specification question rather than a method question, but it interacts with the method: if you are doing full frame anyway, you have the opening open, and it is the moment to fix an undersized or badly placed window rather than replace it like for like.

Title 24 and the NFRC sticker. California sets the performance the new units have to hit for our climate zone. The two numbers on the sticker are U-factor, which is heat conduction, and SHGC, which is how much solar heat gets through the glass. Lower SHGC helps a lot on west and south glass in a climate like ours. You want the stickers left on until the inspector has seen them, and you want copies afterwards.

Vinyl in high heat. Vinyl is what most of these houses get and it is fine, but it expands and contracts more than fiberglass across the temperature swing between a hundred degree August afternoon and a cold January night. That makes the quality of the install matter more than the material choice. A vinyl unit screwed off hard against an out of square opening will bind by the second summer. Fiberglass moves less, costs more, and earns its money on large west facing sliders rather than on a north bedroom.

Santa Ana conditions. The wind events that come through in autumn are the ones that find every unsealed joint in a wall. They are also, usefully, the best free leak test you will ever get. If you feel air at a window during a Santa Ana, note which window and which corner and tell whoever measures.

Older stock. In the Wood Streets and along Victoria Avenue the housing is older, often with original wood windows, and the answer is sometimes neither method. A sound original double hung with good joinery is frequently better restored, reglazed and weatherstripped than replaced. That is not work we sell, and saying it costs us jobs, but a vinyl window in a nineteen twenties opening is a thing you cannot undo.

What Good Looks Like

A company that measures every opening before quoting any of them. A quote that names the method per opening and says why. Permits pulled, because Riverside requires one and the flashing inspection on full frame work is the inspection you actually want to happen. NFRC stickers left on. A labour warranty on water tightness in writing, separate from the manufacturer’s glass warranty, and long enough to matter.

And a straight answer when the honest answer is smaller than the sale. One fogged pane in an otherwise good vinyl window is a failed insulated glass unit, and swapping the glass is often the entire fix.

If you want the openings on your house looked at properly, call Artshay at (951) 839-3855. We will measure, check all five items above at every window, and tell you which method each opening needs before anything gets ordered.