Insulated vinyl siding cost

Insulated vinyl siding costs $700 to $1,300 per square installed, typically about $950. A square is 100 square feet of wall, and the price includes stripping the old siding and new house wrap.

The figure that matters is the gap to standard vinyl at $500 to $1,000 a square. Whether that gap is worth paying depends far less on the insulation than the name suggests, and far more on how straight your walls are.

What it costs

Insulated vinyl sits in the middle of the market: a clear step above builder-grade vinyl, and below engineered wood and fiber cement at both ends of the range. Every figure here is a full re-side, so the comparison is like for like.

What the foam backing actually is

An insulated panel is an ordinary vinyl panel with a contoured slab of expanded polystyrene bonded to the back. The foam is shaped to fill the hollow behind each lap, so the panel no longer bridges an air gap. It sits tight against the wall over its whole face.

That one change does three things, and the R-value is the smallest of them.

It stiffens the panel. Hollow vinyl is a thin plastic shell that follows whatever it is nailed to. With foam filling the back, the panel spans dips in the sheathing instead of telegraphing them, and it resists the rippling known as oil-canning on sunlit walls.

It takes a hit. A ball, a ladder foot or a hailstone that would crack or dent a hollow panel tends to be absorbed by the foam behind it. Panels on the side of a driveway or a play area last longer for this reason alone.

It adds a modest R-value. Roughly R-2 to R-3, and the value is in where it sits rather than how much there is. It runs continuously over the studs, which are the weak point in a framed wall, so it trims the heat that leaks through the framing. That is real, and it is small next to an attic that is short of insulation.

The foam is usually grooved or perforated on the back so water that gets behind the siding can still drain down. The house wrap stays the water barrier, exactly as it does behind standard vinyl.

When the premium pays back

The energy saving alone rarely pays for the upgrade within the life of the siding. Treat any quote that promises it will as a sales pitch. The premium pays for itself in other ways, and it does so in some houses far more than others.

Older houses with wavy walls. Board sheathing, sagging corners and walls that were never quite plumb show through thin vinyl on the first sunny afternoon. Foam-backed panels bridge much of that, and on these walls the difference between the two quotes is visible from the street.

Long, unbroken walls in full sun. A south or west wall with few windows is where oil-canning is worst and where a stiffer panel matters most.

Walls with only cavity insulation. On a house with fiberglass between the studs and nothing outside the sheathing, a continuous layer over the framing does more than the same R-value added anywhere else.

Exposure to knocks and hail. Ground-level walls by a driveway, a basketball hoop or a busy yard, and regions where hail is a regular event.

Noise. The foam deadens sound from rain and traffic. Owners on busy streets often notice this before they notice anything on the utility bill.

When it does not

Straight, new sheathing. On a house with true walls and sound OSB or plywood, a good premium-thickness hollow panel installed correctly can look nearly as straight.

Walls getting rigid foam anyway. If the plan already includes a layer of rigid insulation board over the sheathing, the panel foam adds little on top of it, and the money is better spent on the board.

A short horizon. If you expect to sell within a few years, buyers will see new vinyl, not insulated vinyl. The premium is unlikely to show up in the sale price.

Mild climates. Where heating and cooling loads are light, the R-value is close to irrelevant and only the appearance and impact arguments are left.

What changes on the install

Insulated panels are thicker than hollow ones, and that has knock-on effects a careful quote accounts for.

The J-channel around windows and doors has to be deep enough to receive the thicker panel, so the trim accessories are the wider versions. Window and door casings that were already shallow can end up recessed, and some need extension jambs or new trim to sit right. Ask whether the openings will need build-out and whether it is priced.

The panels still have to move. Vinyl expands and contracts along its length with temperature, and the foam does not change that. Nails go in the center of the slot and are left slightly loose, with a gap at every channel and corner post. A panel nailed tight buckles whether it has foam on the back or not; the vinyl siding guide covers those details.

Insulated panels are also bulkier to ship and to handle, and some manufacturers offer fewer profiles and colors in their insulated lines. If you want a specific dark shade or a board-and-batten look, confirm it exists in the insulated product before comparing quotes.

A worked example: a 2,000 square foot two-story

A two-story house with 2,000 square feet of living area has about 19 squares of wall, plus roughly 3 squares in its two gable ends. The owner has quotes for both insulated and standard vinyl.

Insulated vinyl:

• Walls: 19 squares × $700 to $1,300 per square = $13,300 to $24,700
• Gables: 3 squares × $700 to $1,300 per square = $2,100 to $3,900
• Total: $15,400 to $28,600

Standard vinyl, same house:

• Walls: 19 squares × $500 to $1,000 per square = $9,500 to $19,000
• Gables: 3 squares × $500 to $1,000 per square = $1,500 to $3,000
• Total: $11,000 to $22,000

The gap between $15,400 to $28,600 and $11,000 to $22,000 is the price of the foam, and on most houses it lands in the low to mid thousands. On a house of this age with straight walls and a mild climate, that money is hard to justify. On a 1940s house with board sheathing and a long west wall, it is the difference between siding that looks new and siding that looks cheap. Many owners split it: insulated on the sunny and street-facing walls, standard on the rest, from the same product line so the colors match.

How to read the quote

• Is the panel named by product line, and is the thickness of the vinyl itself stated separately from the foam?
• Is the J-channel and corner trim sized for insulated panels?
• Do any windows or doors need extension jambs or new casing, and is that priced?
• Is house wrap included, and is it named by product? The house wrap guide explains what to look for.
• Is there a per-sheet price for rotten sheathing found once the old siding is off?

Frequently asked questions

Is insulated vinyl siding worth the extra cost?

On older houses with uneven walls, or walls exposed to sun, knocks or hail, usually yes, because it looks straighter and lasts better. On a newer house with true walls in a mild climate, usually not. The energy saving on its own rarely covers the premium.

What is the R-value of insulated vinyl siding?

Roughly R-2 to R-3, depending on the product and the foam thickness. Its value comes from running continuously over the studs rather than from the number itself.

Does insulated siding reduce noise?

Yes, noticeably for rain and traffic, because the foam damps the panel. It will not quiet a house the way new windows or added wall insulation can.

How much more is insulated vinyl than regular vinyl per square?

Compare $950 a square installed for insulated against $750 for standard vinyl at the typical figure. The real gap on your house depends on which grade of standard vinyl it is being compared with.

Related guides

• Vinyl siding cost — grades, thickness and installation details
• Siding replacement cost — measuring wall area in squares
• House wrap cost — the water barrier behind the foam
• Fiber cement siding cost — the next step up in price and life