How to compare commercial window tinting quotes

Two quotes for “tinting the office windows” can differ by thousands of dollars and still both be fair prices, because they are frequently quoting different things. This guide shows you how to line quotes up so you are comparing like with like.

The method in one line: fix the scope, compare named film specifications rather than adjectives, check that somebody looked at your glass, get both warranties in writing, and only then look at the totals. If you would rather work from a printable list, the cost guide has one.

Start by fixing the scope

Before comparing anything, make sure every quote covers the same work:

• The same glass. Ask each quote to list the areas included, by room, elevation or a marked-up floor plan. “All external windows” is ambiguous in a building with a glass entry, skylights and a stairwell void.
• The same film category. A solar film quote and a privacy film quote are not comparable. If installers have proposed different categories, that is worth understanding before price enters the conversation. One of them may have read your problem better.
• The same conditions. After-hours installation, site inductions, parking and access equipment all cost money. If one quote includes them and another is silent, the silent one is not cheaper. It is incomplete.

The most efficient way to achieve all three is to write the brief once and hand the identical document to everyone. That is exactly what NSW Fair Trading advises buyers of building work to do: write a job brief, provide at least three contractors with the same information so the quotes are easy to compare, and expect a written quotation that includes all the work and lists all the materials. It is guidance written for home building, but nothing in that logic is residential.

Compare film specifications, not adjectives

“Premium”, “high-performance” and “commercial-grade” are marketing words. The comparable facts live on the manufacturer’s specification sheet, which any professional installer will supply. For solar films, look at:

• Visible light transmission (VLT). How much light still comes through. Lower numbers mean darker rooms. The Australian Government’s YourHome guide to glazing makes the point most sales conversations skip: a low VLT reduces solar heat gain, but if it goes too low the room becomes dark enough that people switch lights on, which puts energy cost back on the bill.
• Total solar energy rejected (TSER). The overall heat-blocking measure, more meaningful than infrared-only claims.
• Solar heat gain coefficient (SHGC) and U value. The two numbers building codes actually use. SHGC describes how readily heat from direct sunlight passes through the whole window; the U value describes conduction, so a lower U value means better insulation. Both are defined on the same YourHome page.
• UV rejection. Most quality films block the large majority of UV; the sheet states it.
• Internal reflectivity. High values can make glass mirror-like from inside at night.

Ask every installer for the specification sheet of the exact film quoted on your glass type. If a quote cannot name its film, treat the performance claims as unverifiable.

Use the independent rating tables

Australia has a manufacturer-neutral way to check a film’s claims. Under WERS for Film, run by the Window Film Association of Australia and New Zealand, applied films are rated and labelled by an independent laboratory so products from different distributors can be compared on the same basis, and installers can be accredited to issue the resulting certificates. The rating tables are public and searchable, with a commercial tab that lists rated films against a standard commercial window and shows whole-window U value, solar heat gain coefficient and visible transmittance for each.

Two caveats so you use it properly. WERS figures are modelled on standard generic window types, not on your building, so they are for comparing products rather than predicting your result. And not every film on the market is rated. A film’s absence from the tables is a question to ask, not a verdict.

Check the glass-compatibility question was asked

Film changes how glass absorbs heat. On some glass (particularly older annealed panes, double-glazed units and glass that is already tinted or coated) the wrong film raises thermal-stress risk. A professional quote should either state that the film is appropriate for your glass type or note that the installer verified it during the site visit. If nobody looked at your glass before naming a film, ask how the recommendation was made.

Understand both warranties

There are usually two warranties involved:

1. The film manufacturer’s warranty covering the product against bubbling, peeling, cracking and discolouration for a stated period.
2. The installer’s workmanship warranty covering the application itself.

Ask each quote to state both, in writing, with the period and what is covered. Also ask whether the manufacturer’s warranty depends on installation by an accredited applicator, because for some products it does.

There is a third layer that no quote will mention, and it works in your favour. Australian Consumer Law consumer guarantees can cover business purchases: the ACCC’s position is that a business can be a consumer too, and a service bought for business use is covered when it costs less than $100,000 including GST, which takes in nearly every office film project. The ACCC also points out that consumer guarantees are not the same thing as a warranty, and that a business cannot sign those rights away with a clause. So a shorter warranty is not the same as no protection, and a long warranty is not a substitute for work performed with due care and skill.

Weigh the business, not just the number

Cheapest is only cheapest if the job is done properly by a business that will exist when a warranty claim arises. Reasonable things to check:

• How long the business has operated, and whether commercial work is its normal trade.
• Public reviews, and examples of comparable commercial projects.
• Current public liability insurance; any commercial building manager will require it anyway.
• Whether the quote is itemised enough that variations later can be priced against something.
• Whether the ABN on the quote is active and registered for GST. ABN Lookup gives you that free, with no login, from the Australian Business Register, and it also shows the business type and historical trading names. A quote charging GST from a business not registered for it is worth a conversation before it is worth a payment.
• Whether the installer holds WERS for Film accreditation, if energy performance is central to your brief. It is not a requirement for good work, but it is a verifiable credential rather than a claim.

A simple scoring approach

For each quote, note: film named and specification supplied (yes/no); scope itemised (yes/no); glass compatibility addressed (yes/no); both warranties stated (yes/no); site conditions included (yes/no). A quote that scores five out of five at a higher price is very often the better commercial decision than a vague quote at a lower one, because the vague quote’s price is not final. It is an opening position.

Where quotes legitimately differ

Some price differences are real and fair: film brands sit at different price points, crew experience differs, and businesses carry different overheads and warranty support. The goal of comparison is not to find the cheapest number. It is to see clearly what each business proposes to do, with what product, under what protection, and decide which offer is worth its price.