How to Compare Builder Quotes in Perth

How to Compare Builder Quotes in Perth

Two builders can quote the same home and land thousands of dollars apart. Most people read the two figures, assume the lower one is the better deal, and sign. The problem is that the two quotes are almost never describing the same build. Until you line them up properly, you are not comparing price. You are comparing two different sets of assumptions.

This guide walks through how to read two Perth building quotes side by side, so you can see what you are actually paying for before you commit.

Why two quotes are never quite the same

Every builder prices a job with their own allowances, inclusions and exclusions. One might include site works in full. Another might leave them as an estimate to be confirmed later. One might assume a simple slab. Another might price for the fall and fill your block actually needs. The headline number reflects those choices. It does not tell you whether the work behind it is the same.

A lower quote often means less has been included, not that the build costs less. The gap usually appears later, once construction starts and the items left out come back as variations.

Start with the provisional sums

A provisional sum is an allowance for work that has not been fully designed or priced yet. Site works are the common one. If one quote allows 25,000 dollars for site works and another allows 45,000 dollars for the same block, one of those builders is being realistic about what your site needs. The other may be keeping the headline figure low.

Provisional sums are not fixed. If the real cost comes in higher, you pay the difference. So a quote that looks cheaper on paper can carry more risk underneath it. When you compare two quotes, read the provisional sums line by line and ask each builder how they arrived at the figure.

Check the prime cost items

Prime cost items are allowances for products you have not chosen yet. Taps, tiles, flooring, appliances and similar fittings. The builder sets an amount, and you choose the actual product later.

A low prime cost allowance keeps a quote attractive and leaves your final cost open. If the tiles you like cost more than the allowance, you pay the difference. Two quotes can look close on the bottom line while one has set its allowances well below what you are likely to spend. Read the prime cost schedule, not just the total.

Read the exclusions, not just the inclusions

Most people read what a quote includes. Fewer read what it leaves out. Exclusions are where two quotes drift furthest apart.

Common exclusions include floor coverings, window treatments, fencing, retaining walls, site clean and landscaping. If an item is not in the quote, it is not in the price. It is still a cost. It has just moved from the contract to your own pocket. A quote with a longer list of exclusions is not cheaper. It is less complete.

Compare scope, not the bottom line

By now the pattern is clear. The figure at the bottom of a quote is the least useful number on the page. What matters is the scope behind it.

Put the two quotes side by side and work item by item. Where one includes something the other excludes, note it. Where allowances differ, note it. Once both quotes describe the same scope, you can compare them fairly. Often the higher quote turns out to be the more complete build. Sometimes the cheaper one stays cheaper once everything is added back, and now you know that for certain rather than hoping it is true.

A simple way to start

Before you meet either builder again, do this. List every provisional sum in both quotes and compare them. List every prime cost allowance and compare them. Write down every exclusion in each quote. Then add the excluded items back into both prices as rough estimates. The two numbers you end up with sit far closer to the truth than the figures on the front page.

Where an independent review helps

Comparing quotes properly takes time and a working knowledge of how builders structure them. That is the part most people have never done before, because most people build once or twice in a lifetime.

This is the work we do at Build Insight WA. We sit on your side of the table, line your quotes up against each other, and show you what you are genuinely comparing. We do not build and we do not take a margin on your project, so the only interest we have is your outcome.