How to Check Whether a Window Quote Includes VAT
A quote that reads £6,000 can mean £6,000 or £7,200 depending on VAT. Here is how to check, what rate applies to replacement windows, and how to compare fairly.
Key takeaways
- Replacement windows and doors for a domestic property are normally standard-rated at 20% VAT.
- Domestic quotes must show VAT-inclusive prices, so a trade-style ex-VAT figure should be queried.
- A reduced 5% rate applies only in specific circumstances, not to routine window replacement.
- Always compare VAT-inclusive totals, or you are comparing two different numbers.
VAT is the easiest way to be misled by a window quote, because a five-figure job can look 20% cheaper than it is. It is also easy to check: look for the words “inclusive of VAT”, the rate, and a VAT number.
What rate applies to replacement windows?
Supplying and fitting replacement windows and doors in a domestic property is normally standard-rated at 20%. The reduced 5% rate applies to certain energy-saving materials and to some conversions and renovations, such as bringing a long-term empty home back into use, but routine window replacement does not usually qualify. If a quote shows 5%, ask the installer to confirm in writing which relief applies and why.
How to tell whether a quote includes VAT
| Wording on the quote | What it means |
|---|---|
| “Total including VAT” | The figure you will pay |
| “£6,000 + VAT” | You will pay £7,200 at 20% |
| “Prices exclusive of VAT” | Add VAT to every line before comparing |
| No mention of VAT at all | Ask, and get the answer on the document |
| “VAT not applicable” | Query it: replacement windows are normally taxable |
Why this matters when comparing
A trade quote given to a builder is habitually ex-VAT, and that format sometimes finds its way into a homeowner quote. Comparing an ex-VAT quote with a VAT-inclusive one makes the first look 20% cheaper for no reason. Normalise every quote to the VAT-inclusive total before you compare anything else.
What a proper VAT invoice should show
- The installer’s business name, address and VAT registration number.
- A sequential invoice number and the date of supply.
- A description of the goods and services, including the windows supplied.
- The rate of VAT applied and the amount charged.
- The total excluding VAT and the total including VAT.
The bottom line
Assume 20% VAT on replacement windows unless you are given a written reason why a different rate applies. Compare VAT-inclusive totals, and keep the VAT invoice: you will want it for the guarantee and possibly for a future sale.
Frequently asked questions
No. Replacement windows and doors in domestic properties are normally standard-rated at 20%. Zero rating applies to certain new-build work, not to replacement glazing in an existing home.
Yes, normally 20% on the supply and installation together. The installer’s VAT-inclusive total is the price you pay.
A business can show ex-VAT prices, but consumer quotes must not mislead. Always ask for the VAT-inclusive total in writing before comparing.
Sometimes VAT presentation, sometimes scope. Normalise both to VAT-inclusive totals with the same inclusions before drawing conclusions.
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