How Do Builders Price a Renovation Properly?

Quick answer

A reliable renovation price comes from a properly developed scope, not a fast quote. At JSG Construct we visit the site, engage a structural engineer where needed, complete relevant surveys and build the scope with you before pricing your renovation, extension or custom build. That is how a fixed price contract stays fixed.

Why do cheap building quotes end up costing more?

In construction, the cheapest quote is almost never the cheapest project. A quote is only as reliable as the scope it is based on. If a builder has not spent time understanding your project, visiting the site, reviewing the structure and understanding what is behind the walls and under the floor, what they are giving you is not a price. It is a guess dressed up as a number.

Builders who price fast typically do so by making assumptions. Assumptions about existing conditions, structural requirements, service locations and site access are exactly where the expensive surprises live. A 15% saving on the initial quote can quickly become a 30% overrun on the final cost.

How does JSG Construct price a project?

We do not put a number on a project until we understand it properly. For renovations, extensions and custom builds, that means:

• A site visit to assess existing conditions
• Engagement of a structural engineer where required
• A feature and level survey where drainage and levels matter
• A full scope developed with you, not assumed from the plans

This takes more time upfront and sometimes it costs a little money to get the consultants in before the main contract is signed. The result is a price that reflects reality.

What does a fixed price contract actually mean?

A genuine fixed price contract means that what you agreed to is what you pay. Not what you pay unless something unexpected comes up. Not what you pay plus variations for things we should have known about.

The only legitimate variations are things that genuinely could not have been known, such as discovering asbestos behind a wall that was never opened. These are documented, discussed and agreed before any additional cost is incurred. They are the exception, not the rule.

Why does thorough pricing take longer?

We would rather know the real cost of your project before you commit to it. Projects that are properly scoped and priced run smoother, complete on time and end with a client who is happy with the result.

Frequently asked questions

Why is the lowest builder quote often the most expensive in the end?

Low quotes usually rely on assumptions and a thin scope. Once construction starts, missing items appear as variations, which push the final cost well above the original price.

Do you charge for pre-construction and scoping work?

Detailed scoping sometimes involves engaging consultants such as engineers or surveyors before the main contract. We discuss any such costs with you upfront so there are no surprises.

Can a fixed price contract still have variations?

Only for genuinely unknown conditions such as hidden structural issues or asbestos. These are documented and agreed with you in writing before any additional work is done.

Does this pricing approach apply to custom builds and extensions too?

Yes. We use the same scoping process for renovations, extensions and custom new builds so pricing reflects the actual project, not a template.

Talk to JSG Construct about your project

Planning a renovation, extension or custom build? Speak with JSG Construct about your project and start with a clear scope and a realistic price.