How to compare building quotes and choose the right builder
Building quotes can vary significantly, making it difficult to know if you’re comparing apples with apples
While price is naturally an important consideration, choosing a builder based solely on the lowest quote can lead to unexpected costs, delays and frustration later on.
Whether you're planning a renovation, extension or new build in Auckland, understanding what's included in a quote and why prices differ will help you make a confident, informed decision.
Why are building quotes so different?
It's common to receive quotes that vary by tens of thousands of dollars for the same project. This doesn't necessarily mean one builder is overcharging or another is offering a bargain.
Different builders may make different assumptions about:
The quality of materials and finishes
Site access and preparation requirements
Project management and supervision
Subcontractor costs
Allowances for unknowns
The level of detail provided in the plans and specifications
A lower quote may look appealing initially, but it's important to understand exactly what's included and what may be missing before making a decision.
What information does a builder need for an accurate quote?
The more detailed your plans and specifications, the more accurate your quote will be.
To prepare a comprehensive building quote, a builder will typically need:
Specifications and schedules
Engineering details
Site information
Electrical and plumbing plans
Details of fixtures, fittings and finishes
If key decisions haven't been made yet, they may need to include allowances or estimates, which can affect the accuracy of the final price.
How do you compare building quotes properly?
When reviewing quotes, look beyond the bottom line and compare each proposal carefully.
Ask yourself:
Do the quotes cover the same scope of work?
Are the materials and finishes comparable?
Is project management included?
Are site preparation and clean-up included?
Have subcontractor costs been allowed for?
Are consent-related costs included?
What exclusions are listed?
A detailed quote should clearly explain what is included, what isn't included and where allowances have been made.
What should be included in a building quote?
A professional building quote should be transparent and give you a realistic understanding of project costs.
Typical inclusions may cover:
Labour and materials
Site management and supervision
Health and safety management
Subcontractor coordination
Waste removal
Temporary site facilities
Project scheduling
Consent administration where applicable
It's equally important to review the exclusions. If anything is unclear, ask questions before signing a contract.
What's the difference between a fixed price & cost plus contract?
A fixed price contract is when a builder agrees to complete the specified work for an agreed amount.
Benefits include:
Greater budget certainty
Easier financing and lending approvals
Reduced risk of unexpected costs
However, any changes to the agreed scope after signing may result in additional costs.
With a cost plus contract, the client pays the actual cost of labour and materials plus an agreed margin.
Benefits include:
Greater flexibility during construction
Useful for complex renovations where hidden issues may arise
The trade-off is that final costs can be less predictable.
Your builder should clearly explain which contract type is being used and how any variations will be managed.
What are provisional sums & prime cost sums?
Provisional sums are allowances for work that can't be priced accurately at the time of quoting. Instead, it’s an estimate based on the information the builder has, or if they anticipate an issue based on their experience. The more detailed information you can provide, such as electrical and plumbing plans and specific fixtures and fittings, the fewer provisional sums your quote will have.
Examples include:
Earthworks
Drainage work
Excavation
Structural repairs discovered during renovations
Unforeseen issues frequently come up in building projects, particularly during a renovation. The age and condition of your home play a part in this, and we always recommend having a contingency fund set aside.
Prime cost sums are allowances for the supply of products that haven't been finalised yet.
Examples include:
Tapware
Appliances
Bathroom fixtures
Tiles
Light fittings
The final cost may increase or decrease depending on your selections.
Should you choose the cheapest building quote?
Not necessarily. If one quote is significantly lower than the others, it's worth investigating why.
A cheaper quote may indicate:
Missing scope items
Lower-quality materials
Inadequate allowances
Less project management
Fewer site visits or supervision
Future variations that haven't been accounted for
A realistic, transparent quote often provides better value than a low price that results in budget blowouts later.
How do you check a builder's credentials?
Before accepting any quote, take the time to assess the builder's experience and reputation.
Consider:
Are they a Licensed Building Practitioner (LBP)?
Do they belong to a professional organisation such as NZ Certified Builders? Builders must go through an application process to be accepted as a member. This includes peer review and a number of reference checks. It may also give you a dispute resolution process if any problems arise, or extra warranties if the work isn’t done properly.
Can they provide recent client references?
Do they have experience with projects similar to yours?
Do they offer guarantees or warranties?
Can they show examples of completed work?
A builder's experience, communication and project management capabilities are often just as important as the quoted price.
What questions should you ask before accepting a building quote?
Before making your decision, ask:
What is specifically excluded from the quote?
How will variations be managed?
What provisional sums are included?
Who will manage the project day to day?
How often will communication occur?
What is the estimated construction timeline?
What guarantees are provided?
A good builder will be happy to answer your questions and explain any part of the quote in plain language.
How can a builder help avoid budget blowouts?
One of the biggest advantages of working with an experienced builder is getting realistic advice from the beginning.
A professional builder can help by:
Identifying potential issues early
Providing accurate cost estimates
Minimising provisional sums where possible
Offering practical construction solutions
Managing subcontractors and scheduling efficiently
Keeping communication clear throughout the project
Good planning and transparent pricing significantly reduce the risk of costly surprises during construction.
Why Auckland homeowners choose Qualitas Builders
Qualitas Builders provide a complete project management and construction service, coordinating everything from initial site works through to the final finishing touches.
We believe a building quote should be transparent, realistic and easy to understand. We use our experience and expertise to give you a realistic cost, rather than a cheaper price with hidden surprises and budget blowouts. If you have questions, or want to know why there are differences between quotes you’ve received, we’re happy to look at the allowances, notes and tags to let you know what questions to ask to reveal more details.
If you're planning a renovation, extension or new build and would like expert guidance, get in touch with Qualitas Builders. We're here to help you build with confidence.
Frequently asked questions
Why are building quotes so different?
Building quotes can vary because builders may allow for different materials, finishes, project management levels, subcontractor costs and construction methods. A lower quote may also exclude items that another builder has included, making it important to compare the scope of work carefully.
What should be included in a building quote?
A building quote should clearly outline the scope of work, labour, materials, project management, subcontractor costs, allowances, exclusions and any provisional sums or prime cost sums. It should also explain how variations and additional costs will be managed.
What is the difference between a fixed price and cost plus contract?
A fixed price contract provides an agreed price for a defined scope of work, giving greater budget certainty. A cost plus contract charges the actual cost of labour and materials plus an agreed margin, offering more flexibility but less certainty around the final cost.
Should a homeowner choose the cheapest building quote?
Not necessarily. The cheapest quote may exclude important items, contain unrealistic allowances or result in additional costs later. Homeowners should compare the scope, quality, experience and inclusions of each quote to ensure they are receiving the best overall value rather than simply the lowest price.
What are provisional sums in a building quote?
Provisional sums are estimated allowances for work that cannot be accurately priced when the quote is prepared. Common examples include earthworks, drainage or unforeseen renovation work. The final cost may be higher or lower depending on the actual work required.
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