Renovation Budget Guide: How to Plan Your Project Costs

Nov 2, 2020
8 min read

Updated: 6 days ago

Creating a renovation budget may not be the most exciting part of a project, but it's one of the most important. While some people enjoy crunching numbers and building spreadsheets, many homeowners would rather jump straight to choosing finishes and planning their dream space.

However, a well-planned renovation budget can help you make informed decisions, avoid unexpected expenses, and keep your project on track from start to finish. Whether you're renovating a bathroom, updating your kitchen, or tackling a whole-home transformation, having a clear budget in place is essential.

To help you get started, we've put together a simple step-by-step guide to creating a renovation budget, along with practical tips for keeping your spending under control throughout the project. For tips on planning a renovation, check out "How to Plan a Successful Home Renovation".

How to Create a Renovation Budget

A spreadsheet can be one of the most effective tools for planning and managing renovation costs. It doesn't need to be complicated, but it should be detailed enough to help you understand exactly where your money is being allocated.

Step 1: List the Areas You Want to Renovate

Start by creating headings for each area of your home that you plan to renovate. For example:

Kitchen
Living Room
Master Bedroom
Bathroom
Laundry

This will give you a clear overview of the scope of your project and help you organise costs by space.

Step 2: Break Each Space Into Individual Projects

Under each room heading, list the specific improvements you want to make.

For example, under "Bathroom" you might include:

New shower
New vanity
Updated flooring
Lighting upgrades
Painting

For a kitchen renovation, your list may include:

New cabinetry
Benchtops
Appliances
Splashback
Flooring

Breaking your renovation down into smaller components makes it easier to estimate costs and identify priorities.

Step 3: Add Costs and Track Your Spending

As you research products, request quotes, and compare options, begin adding costs to your spreadsheet.

Include as much detail as possible, such as:

Fixtures and fittings
Appliances
Flooring materials
Lighting
Cabinetry
Paint
Labour costs
Consent fees, where applicable

The more detailed your renovation budget is, the more accurate it will be. You'll also be able to quickly identify areas where you may be overspending or opportunities to make savings.

Remember that your budget should be treated as a live document. Update it regularly as quotes are received, products are selected, and project requirements evolve.

Builder's Tip: After renovating Wellington homes for more than 20 years, we've found that hidden work inside older homes is one of the biggest reasons renovation costs change. Planning for these possibilities early can help reduce stress and keep your project moving smoothly.

How Much Should You Budget for a Renovation?

The cost of a renovation depends on factors such as the size of the space, the age of your home, the level of structural work required, the quality of the finishes you choose, and whether building consent is needed.

While it's tempting to compare projects online, every renovation is different. The most accurate way to establish your budget is to obtain detailed plans and speak with an experienced renovation builder who can provide realistic cost expectations.

Fixed-Price vs Estimate-Based Contracts

When planning your renovation budget, it's important to understand the type of pricing you are being given. Not all quotes are structured the same way, and this can have a big impact on your final project costs.

A fixed-price contract gives you more certainty because the agreed scope of work is priced upfront. This can be helpful if you want clearer cost control and fewer surprises. However, it is important to remember that changes to the scope, product selections, or unexpected issues may still result in variations.

An estimate-based contract is usually less certain. It provides an indication of likely costs, but the final amount may change depending on labour, materials, site conditions, and project requirements. This can sometimes work well for projects where the full scope is difficult to define at the beginning, but it does require careful monitoring.

Before choosing a builder or contractor, make sure you understand exactly what is included, what is excluded, and how any variations will be handled. Comparing quotes properly can help you avoid confusion and make a more informed decision.

For more guidance, read our guide to understanding and comparing builders' quotes.

How to Prioritise Spending When Budgets Are Tight

If your renovation budget doesn't stretch to everything on your wish list, prioritisation becomes essential.

Start by focusing on the work that will have the biggest impact on how you use the space. This may include improving layout, fixing structural or moisture issues, upgrading poor lighting, or replacing items that are no longer functioning properly.

Next, separate your needs from your nice-to-haves. A new vanity, better storage, or improved ventilation may be more important than premium tapware or high-end finishes. That doesn't mean you need to compromise on the final result, but it does mean making thoughtful decisions about where your money will work hardest.

It can also help to think long-term. Spending more on quality workmanship, durable materials, or practical design may save money later by reducing the need for repairs or changes.

If needed, your renovation can also be completed in stages. Completing essential work first and leaving cosmetic upgrades for later can help you move forward without overextending your budget.

Over the years, we've found that investing in structural work, waterproofing and quality workmanship usually delivers better long-term value than spending the same amount on cosmetic upgrades alone.

The cheapest renovation isn't always the one with the lowest quote. A realistic budget, quality workmanship and careful planning will almost always save you money over the life of your home.

Renovation Budget Tips to Keep Your Project on Track

Once you've established your budget, the next challenge is sticking to it. These practical tips can help:

Identify Your Non-Negotiables

Before making any purchasing decisions, determine which elements of the renovation are essential and which are simply nice to have.

For example, if your kitchen cabinetry is failing and your appliances are outdated, those items may take priority over decorative upgrades.

Focusing on your must-haves first can help prevent budget blowouts and ensure the most important work gets completed.

Remember that renovations can often be completed in stages. If your budget doesn't stretch to everything at once, some improvements may be able to wait until a later date.

Research Products, Materials and Suppliers Early

Spend time exploring products, materials, and finishes before making final decisions.

You may discover alternatives that provide a similar look and performance at a lower cost. Conversely, you may find that investing slightly more in certain products delivers better long-term value.

Keeping a record of products and pricing in your spreadsheet will help you compare options and make informed decisions.

Set a Realistic Maximum Spend

It's easy to become carried away once renovation ideas start flowing.

Before you begin, establish a maximum budget that reflects your financial position and your property's value.

Consider:

Your available funds
The value of comparable homes in your area
The likely return on investment
Your long-term plans for the property

Having a defined spending limit can make decision-making much easier throughout the renovation process. Before committing to a renovation budget, it's also worth asking whether now is the right time to renovate. If you're weighing up rising building costs, interest rates or economic uncertainty, our guide to When Is It Worth Renovating in Uncertain Times? explores the factors that can help you make a confident, informed decision.

Choose the Right Renovation Contractor

While obtaining multiple quotes is important, choosing a contractor based solely on price can be risky.

A lower quote doesn't always represent better value if it leads to poor workmanship, project delays, or costly rework later.

Look for a contractor with:

Relevant experience
Positive client reviews
Strong communication
Appropriate licences and qualifications
A proven track record of delivering successful projects

Include a Renovation Contingency Fund

After renovating homes throughout Wellington for more than 20 years, we've found that homeowners almost always underestimate the cost of hidden work. Once walls are opened, it's not uncommon to discover outdated wiring, plumbing that no longer meets code, or moisture damage that wasn't visible beforehand.

A good rule of thumb is to set aside at least 10% of your renovation budget as a contingency fund. This

provides a financial buffer if unforeseen work becomes necessary.

The right contractor can help you make smarter decisions, identify cost-saving opportunities, and avoid expensive mistakes. It's also worth understanding what protections are available during your project, including the benefits of a Master Build Guarantee.

Common Renovation Costs That Are Easy to Overlook

Even the best-planned renovation budgets can miss a few important expenses. While it's easy to focus on the obvious costs like cabinetry, flooring or paint, there are often additional items that only become apparent as planning progresses. Here are some of the most commonly overlooked:

Council and professional fees (building consents, engineering, architectural drawings and specialist reports)
Temporary accommodation if you need to move out during part of the renovation
Storage and moving costs for furniture and belongings
Service upgrades, such as replacing outdated wiring, plumbing or insulation discovered during construction
Landscaping and exterior reinstatement, including driveways, paths and gardens
New appliances, curtains or furniture to complement the renovated space
A contingency fund for unexpected issues uncovered once work begins

Renovation Budget Planner | Orkney Group

Frequently Asked Questions About Renovation Budgets

How much contingency should I allow for a renovation?

A good rule of thumb is to set aside around 10% of your total renovation budget as a contingency fund. Older homes, in particular, can reveal hidden issues such as outdated wiring, plumbing problems or moisture damage once construction begins. Having a contingency fund gives you peace of mind and helps keep your project moving if unexpected work becomes necessary.

Can I renovate my home in stages to spread the cost?

Yes. Renovating in stages is a practical option if your budget doesn't allow you to complete everything at once. Many homeowners choose to tackle structural work, kitchens or bathrooms first, then return later to complete cosmetic upgrades or additional rooms. Planning the overall renovation from the outset can help ensure each stage works seamlessly with the next.

Should I get more than one builder's quote?

Yes. Obtaining two or three detailed quotes can help you understand the likely cost of your renovation and compare what's included. However, don't base your decision on price alone. Experience, communication, workmanship and the level of detail provided in the quote are just as important when choosing the right builder.

Not all builders' quotes are presented in the same way, so it's important to understand exactly what you're comparing. Our guide to Understanding and Comparing Builders' Quotes explains how to compare quotes fairly, identify hidden costs and avoid common mistakes that could end up costing you more in the long run.

Can I live in my home during a renovation?

It depends on the size and complexity of the project. Many homeowners can remain in their home during smaller renovations, although there may be some disruption. For major renovations involving kitchens, bathrooms or structural work, temporary accommodation may be the more practical option. Your builder can advise you on what's realistic for your project.

How can I avoid going over budget?

The best way to avoid budget blowouts is to plan thoroughly before work begins. Define your priorities, obtain detailed quotes, make as many product selections as possible before construction starts, and include a contingency fund for unexpected costs. Working with an experienced renovation builder can also help identify potential issues early and reduce the likelihood of costly surprises.

Is it worth renovating in uncertain economic times?

It depends on your personal circumstances, the condition of your home and your long-term plans. While economic conditions can influence building costs and borrowing, delaying essential renovations isn't always the best option. If you're weighing up the pros and cons, our guide to When Is It Worth Renovating in Uncertain Times? explores the key factors to consider before making your decision.

Planning a Renovation in Wellington?

Every renovation is different, and so is every budget. Whether you're planning a new kitchen, a home extension or a complete renovation, we'd be happy to talk through your ideas, discuss realistic budget expectations and explain where your money is likely to have the greatest impact.

There's no obligation, just practical advice from a team that's been renovating Wellington homes for more than 20 years.