Contract variations in Western Australia

What the Home Building Contracts Act 1991 (WA) asks of a variation, and a form that follows it. Fill it in below — the document uses the WA wording.

What the law says

A variation must be in writing, set out all of its terms and its cost, show its date, and be signed by the builder and the owner (section 7(1)).
The owner must get a copy before the varied work starts (section 7(2)).
Section 8 covers variations caused by unforeseen circumstances or a lawful direction, with a statement due within 10 working days.
The Act covers home building contracts between $7,500 and $500,000.

Source: Home Building Contracts Act 1991 (WA), read 27/09/2026. A summary, not legal advice.

What the document prints for WA

This variation is set out in writing under section 7 of the Home Building Contracts Act 1991 (WA): it states all of its terms and its cost, shows its date, is signed by the builder and the owner, and a copy is to be given to the owner before the varied work starts.

The form asks for what every VaryPro document needs: the parties, the site, a description and the priced lines.

Who is sending it

State or territory of the site

Your details — the builder

Business nameABN (optional)Registered builder no. (optional)Person signing (optional)Who signs for the business. Their name is filled in when you sign.EmailYour copy and the signed PDF come here.Phone (optional)Address (optional)

The owner — who signs it

Owner's name, or all the owners' namesPerson signing (optional)If one owner signs for all of them. It goes on the document, and their name is filled in when they sign.EmailThe signing link goes here. It must be different from yours.Phone (optional)Address (optional)

Site and contract

Project name (optional)What you both call the job. It goes first on the document.Site addressContract date (optional)Contract reference (optional)Original contract price, inc GST (optional)The price in the signed contract.Contract price before this variation, inc GST (optional)The original plus the variations signed before this one. On Variation 1 you can leave it blank.

It is a cost-plus contract

The variation

Variation numberAsked for byDate it was asked for (optional)What changes — the work added or taken outWhy it is needed (optional)

It adjusts a prime cost item or provisional sum (an allowance in the contract)

Price — amounts ex GST

Margin on the work added, % (optional)Worked out on the lines marked Add, before GST, and printed as its own line.

Net change ex GST: $0.00
GST 10%: $0.00
Total inc GST: $0.00

Payment, time and permits

When the extra is paidNever before the varied work starts.

It changes the completion dateIt needs an amended building permit, approval or plans

Substantiation

Optional. Photos of the work, quotes, dockets or drawings that back the variation — up to 10, 20 MB in all. Each goes in after the signatures as a numbered annexure: an image fitted to its page, a PDF listed with its link.

Add photos or PDFs0 of 10 · 0 KB of 20 MB

Files upload as you add them and are kept privately. If the variation isn't sent, they're deleted after a day.

Before it can be sent

Your name (the builder)
Your email address
The owner's name
The owner's email address — the signing link goes there
The site address
A description of the work added or taken out
At least one priced line

The preview is free and marked PREVIEW. Nothing is sent or stored until you sign and send it.

Sign and send

Still to fill in: Your name (the builder), and 6 more listed above.

VARYPRO

Contract variationVariation 1

Contract variation

Variation 1 to the parties' contractPreview — not sent

Builder

Name

Owner

Name

Site

Site address

State

The variation

Requested by the owner

Describe the work added or taken out

Price

Work added (+) or taken out (−)	Amount ex GST
No priced lines yet

When the change in price is paid

With the next progress claim after the varied work starts

Never before the varied work starts.

Time

No change to the completion date.

Permits and approvals

No amended building permit, approval or plans needed.

Net change (ex GST)	$0.00
GST 10%	$0.00
Total change (inc GST)	$0.00

Western Australia — the law this document follows

This records an agreement between the parties under their own contract. VaryPro prepares and delivers the document; it is not a party to it and does not give legal advice.

Signed by the builder

Signed when the document is sent

Signed by the owner

Signed when the document is sent