Costing a Whole-House Window Treatment Project

Pricing a single blind is easy; pricing a whole house is where budgets quietly get away from people, because installation, measuring fees, discounts, and tax all layer on top of the sticker price for each window in ways that are easy to lose track of by hand. Our Window Treatment Cost Estimator exists specifically to build that total up transparently, one layer at a time, so nothing gets missed. Here’s a full worked example, built up step by step, for a realistic small project.

Setting up the project: six windows, three treatments

Say a household is dressing six windows across three rooms in one order: three bedroom windows getting cordless cellular shades at $90 each, one larger living-room window getting a roller shade at $150, and two kitchen and bathroom windows getting faux-wood venetian blinds at $70 each. Entered as three separate lines — rather than one blended average price — the calculator totals the items themselves, before anything else is added, at an items subtotal of $560 across all 6 windows.

Adding installation, line by line

Professional installation is usually priced per window rather than per order, since the labour is roughly the same whether the blind cost $70 or $150. Add a representative $20 per window across all six windows, and the running total moves from $560 to $680 — the $560 items subtotal plus $120 of installation ($20 × 6 windows).

Adding a one-off measuring fee

Many retailers charge a flat, one-off fee for an in-home measuring visit, separate from per-window installation, since someone has to visit the property once regardless of how many windows they end up measuring. Add a representative $50 measuring fee on top of the running total, and it moves from $680 to $730 — the fee applies once to the whole order, not once per window, which is exactly why the calculator keeps it as a separate field rather than folding it into the per-window installation rate.

Applying a whole-order discount

A seasonal or bulk-order discount is typically applied to the subtotal after items and labour but before tax, reflecting how most retailers actually structure a quote. Apply a 5% discount to that $730 running total and it comes to a $36.50 reduction, bringing the total down to $693.50. Notice that the discount is calculated against the full pre-tax total, including installation and the measuring fee, not just against the raw item prices — a detail that matters if you’re trying to sanity-check a retailer’s own quote against this figure by hand.

Adding sales tax last

Tax applies after the discount, on the discounted amount, which is the order most jurisdictions actually use and the order the calculator follows by default. A 7% tax rate on that $693.50 discounted total adds $48.55, bringing the final order total to $742.05 for all six windows, fully installed, measured, discounted, and taxed.

What that works out to per window

Dividing the $742.05 final total across the 6 windows gives an average cost of $123.67 per window — a genuinely useful single figure for comparing this whole-house quote against a different retailer’s quote for a similarly sized job, even when the two quotes are broken down into completely different line items. A per-window average is also the most honest way to compare a job that mixes cheap and expensive treatments (as this one does, spanning $70 to $150 per item before extras) against a second quote priced more uniformly across every window.

Seeing what each layer actually cost

Walking back through the build-up shows exactly where the money went: $560 for the treatments themselves, $120 for installation, $50 for measuring, minus $36.50 for the discount, plus $48.55 in tax. Installation alone added over 21% on top of the raw item cost in this example, which is a useful thing to know before deciding whether a DIY inside-mount install — using the technique in our guide to measuring windows for blinds — is worth the labour saving for a household comfortable doing it themselves. Even a partial DIY approach, doing the straightforward bedroom windows yourself while paying for professional installation only on the trickier bay window, is a legitimate way to bring a whole-house total down without giving up professional help where it genuinely earns its cost.

Budgeting a project in phases instead of all at once

Not every household wants to dress every window in one order, and the same layered approach works just as well for a phased project. Cost the bedrooms this year using their own item lines, installation, and any fee or discount that applies to that smaller order, and cost the living areas next year as a second, separate calculation with whatever pricing and tax conditions apply at that later time. Trying to estimate a phased project by mentally splitting one big combined total in half is far less accurate than simply running two smaller, honest calculations, since installation minimums, measuring fees, and discount thresholds often don’t scale down cleanly from a whole-house quote to a partial one.

Getting multiple quotes onto the same footing

When comparing quotes from more than one retailer, the biggest source of confusion is usually that each one bundles its costs differently — one includes installation in the per-window price, another lists it separately, a third waives the measuring fee above a certain order size. Re-enter each retailer’s numbers into the same calculator, using its separate fields for items, installation, fee, discount, and tax, and you get every quote expressed in the same structure regardless of how the retailer chose to present it on their own paperwork. That’s often the only reliable way to tell whether a lower headline total from one retailer is genuinely cheaper once every layer is accounted for on both sides.

Mixing treatment families in the same project

Nothing about the calculator requires every line to be the same style of treatment, which is exactly why this worked example mixes cellular shades, a roller shade, and faux-wood venetians in one order. If you’re still deciding which family suits which room, our comparison of blinds vs curtains vs shutters and our tour of types of blinds and shades both help you settle on a per-room treatment before you start filling in prices line by line. And our Standard Window Size Reference shows a rough estimated cost alongside order size, slat count, and fabric yardage for nine common window sizes, if you want a sense of scale before your own quotes come in.

A second worked example: a bigger house, a bigger discount

Scale changes the arithmetic’s shape, so it’s worth seeing a larger project too. Take a ten-window house: five bedroom and hallway windows at $60 each (roller shades), three living and dining windows at $110 each (cellular shades), and two shutter-fitted windows in a prominent bay at $300 each. That’s an items subtotal of $1,230 across 10 windows. Add $15 per-window installation ($150 total) and no separate measuring fee this time, since this retailer bundles it into the per-window rate, and the running total reaches $1,380. Apply a larger 10% whole-order discount — more common on bigger jobs — and that discount comes to $138, bringing the total to $1,242. Add an 8% local tax rate on that discounted figure and you get $99.36 of tax, for a final total of $1,341.36 across all ten windows, or $134.14 per window on average once the two premium shutter windows are blended in with the eight cheaper ones.

Common budgeting mistakes this build-up avoids

A few habits cause most whole-house budgets to come in wrong, and building the total up layer by layer avoids all of them. The first is forgetting installation entirely and comparing a bare item-only quote against a fully installed one from a different retailer — in the first worked example above, installation alone added over 21% to the raw item cost, more than enough to flip which of two quotes is actually cheaper. The second is applying a discount to only part of the order (say, only the item cost) when a retailer’s real discount applies to the full pre-tax total including labour and fees, which understates the discount’s real value. The third is calculating tax on the pre-discount amount instead of the post-discount one, which overstates the final total. And the fourth, specific to mixed projects like both examples here, is averaging per-window prices before entering them rather than entering each treatment as its own line — doing that hides exactly which room is driving the bulk of the cost, which matters if you need to trim the budget and want to know where trimming actually helps.

Re-running the numbers as quotes come in

Treat this build-up as a template, not a one-time exercise: as real quotes come in from different retailers, re-enter their actual per-window prices, installation rates, fees, and any discount or local tax rate, and let the calculator do the same layered arithmetic on your real numbers. Because every layer is entered separately, you can isolate exactly which part of two competing quotes actually differs — a lower item price that’s offset by a much higher measuring fee, for instance — rather than comparing two opaque bottom-line totals and guessing at why they don’t match. Keep each quote’s inputs saved somewhere alongside the calculator’s output, so that months later, when a second contractor’s quote arrives for a follow-up room, you can compare it against the same structured breakdown rather than a half-remembered headline number.