New Builds

Converting a garage to a granny flat is an excellent option for adding additional living space without constructing a new building. Whether you require a space for an elderly parent, a guest house, or a rental property, a garage conversion can be a cost-effective option. But how much does it cost to turn a garage into a compliant, fully functioning living space in Nelson? Here, we’ll break down the costs, pricing factors, and what you need to know before you start the project.

How Much Does It Cost?

The cost to convert a garage to a granny flat in Nelson can range from $50,000 to $150,000+, depending on the amount of work to be done. Here’s an approximate breakdown:

1. Basic Garage Conversion – $50,000 to $80,000

A basic conversion includes:

• Insulation and drywall
• Basic floor
• Simple electrical and plumbing
• A small bathroom
• A simple kitchenette

This would be ideal if the garage is already in good condition and only needs some minor upgrades.

2. Mid-Range Conversion – $80,000 to $120,000

A mid-range conversion includes:

• Full bath with shower
• Full kitchen with appliances and cabinetry
• New flooring and insulation
• Heating and ventilation system
• Windows and doors for appropriate light and ventilation

This is an appropriate choice if you want to enjoy a comfortable living space that keeps up with the times.

3. High-End Conversion – $120,000 to $150,000+

A high-end conversion includes:

• High-quality finishes (custom cabinetry, stone countertops, high-end flooring)
• Smart home features (heating control, security, lighting)
• Additional storage space and built-in furniture
• Added structural modifications
• Energy-efficient features like solar panels

Select this option if you want a high-end, independent granny flat which is similar to a luxury home.

What Affects the Cost?

Several factors decide the total cost of a garage conversion:

1. Structural Modifications

• Do you need to add new walls, a roof, or reinforce the frame?
• Are new doors and windows being fitted?
• Will you need to raise the ceiling or open up the room?

2. Plumbing & Electrical Work

• Installing a bathroom and kitchen requires extensive plumbing.
• Electrical work for lighting, power outlets, and heating adds to the cost.
• If your garage isn’t connected to existing water and sewage lines, this will be a major expense.

3. Insulation & Ventilation

• Garages aren’t built for year-round living, so you’ll need proper insulation.
• Heating and ventilation systems may be required to meet the NZ Building Code.

4. Permits & Council Fees

• In Nelson, you will need a building consent for most garage conversions.
• Fees range from $2,000 to $5,000, depending upon how complicated the job is.
• You will also need a resource consent if the conversion affects neighbours or the environment.

5. Labour & Materials

• Labour costs depend upon whether you hire a plumber, electrician, etc.
• Materials like flooring, cabinetry, and appliances drive the final cost.

Do I Need Council Approval in Nelson?

Yes, you will likely need a building consent from Nelson City Council. The conversion must meet New Zealand’s Building Code requirements for ventilation, fire, and insulation.

• If you’re having plumbing and electrical work done, you require permits.
• If the conversion changes the size or exterior of the garage, a resource consent might be required.
• Seek information from the Nelson City Council for specific requirements before you start.

How Long Does a Garage Conversion Take?

A garage conversion will typically take 2-6 months, depending on how complex the project is. The phases are:

1. Planning & Permits (1-2 months) – Council approval and designs completed.
2. Construction (2-4 months) – Building work, plumbing, electrics, and interior fit-out.
3. Final Inspections (1-2 weeks) – Council building compliance approval.

Benefits of a Garage Conversion to a Granny Flat

• Cost-Effective Housing Solution – cheaper to build than a new home.
• Additional Rental Income – Can generate $300 to $500 per week of income in Nelson.
• Enhances Property Value – Enhances resale value and increases living area.
• Multigenerational Living – Suitable for aging adult children or parents.

FAQ – Nelson Garage to Granny Flat Conversion

1. Is a permit required for converting my garage?

Yes, typically you will need a building consent to ensure the conversion meets NZ building and safety standards.

2. Is it legal to lease a converted garage in Nelson?

Yes, if the conversion is to all Building Code and Council requirements, you are legally able to rent it out.

3. How much does it cost to have council approval?

Building consent is between $2,000 and $5,000, depending on the degree of complexity involved in the job.

4. Do I need to fit insulation and heating?

Yes, you must fit insulation and a heating source to enable the room to be used as a dwelling and comply with New Zealand’s Healthy Homes Standards.

5. Can I do a garage conversion myself?

Some parts of the project, like painting and flooring, are DIY. However, plumbing, electrical, and structural changes require licensed professionals.

6. Is it cheaper to convert a garage than to build a new granny flat?

Garage conversions are generally 30-50% cheaper than building a freestanding granny flat since the building already stands.

Converting a garage into a granny flat in Nelson is an excellent method of adding functional living space, for relatives or as a rental unit. Prices will vary depending on the amount of work the project involves, but with planning, council approvals, and builders support, it can be a wise investment.

If you are planning to convert your garage, talk to use about getting an estimate and we’ll help ensure that you meet all Nelson City Council requirements.

A Realistic Timeline for Your New Home Build

Building a house takes time, and two projects don’t always have the same timeline. A straightforward new build on a flat block might take six to nine months, but a custom home with high-end finishes might take twelve months or more.

It’s not just about laying bricks and putting up walls. The process starts long before construction begins, with planning, council approvals, and site preparation all adding time. Below, we’ll break down the key stages of building a house in New Zealand, the common causes of delays, and how to keep things on track.

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1. The Main Stages of a New Build

House construction passes through three main phases: pre-construction, construction, and final inspections. The speed of each process depends on the complexity of the design, materials’ availability, and efficiency of the process.

Pre-Construction: 3 to 9 Months

Before any physical construction, there are a couple of crucial steps:

• Land hunting and land purchase – 1 to 3 months
• Planning and designing – 1 to 3 months
• Consent approval phases – 3 to 6 months
• Contract and financial completion – 1 to 2 months

The biggest time factor in this phase is council approvals. The Tasman District and Nelson City councils usually work through consents within 3 to 6 months, but any necessary changes may lead to further delay.

Construction: 4 to 12 Months

Once the paperwork is settled, the physical construction begins. The length of this process will depend on how complex the house and any delays in materials or weather. 

• Site work and foundations – 2 to 4 weeks
• Framing and structure building – 4 to 8 weeks
• Roof, windows, and exterior finishes – 4 to 6 weeks
• Plumbing and electrical installations – 4 to 8 weeks
• Interior finishes (painting, flooring, cabinetry, fixtures) – 4 to 12 weeks

A straightforward build will generally fit within a six to twelve-month period, whereas larger, architect-designed homes are more time-consuming, especially if they incorporate complex features like high ceilings, custom joinery, or further structural elements.

Final Inspections & Handover: 1 to 3 Months

Prior to occupation, the dwelling will be required to have its final council inspections and receive a Code Compliance Certificate (CCC).

• Council inspections and compliance checks – 4 to 8 weeks
• Final landscaping, driveway, and finishing touches – 2 to 6 weeks

Sometimes the CCC process will take longer than expected, especially if any aspect of the build requires rectification before sign-off.

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2. What Can Slow Down the Process?

Even with a well-planned project, delays can occur. These are some of the most important things that can blow out your timeline:

1. Council Approval & Consent Delays

If your construction involves further engineering reports or changes to planning, this can delay the consent process beyond the usual 3 to 6 months.

2. Weather Conditions

Nelson has a generally mild climate, but wet winter months (May–August) can hinder progress, especially during foundation and framing stages.

3. Labour and Material Shortages

New Zealand’s construction industry has experienced supply chain issues in recent years, with delays in procuring items like GIB board, timber, and steel. This can set back schedules, especially if items are not pre-ordered.

4. Design Changes During the Build

Modifying things once building has commenced—like altering the floor plan, including extra features, or upgrading materials—can tack on weeks or even months to the build.

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3. How to Speed Up the Build Process

While some delays are unavoidable, there are measures that can be taken to ensure your build remains on track:

• Get building consent in advance – Lodging ready-to-go plans can eliminate council delays.
• Hire a smart builder – A good builder with a solid project management system can save you time.
• Order materials in advance – Some materials take a long time to arrive, so ordering them in advance can save time.
• Stay with your original plan – Changes at the last minute tend to involve more work, additional expense, and longer delays.
• Plan for the seasons – Commencing in spring or summer can reduce weather-related delays.

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4. FAQs Building a House in New Zealand

How long does it take to build a house after consent is approved?

Once building approval is granted, the build typically takes six to twelve months, depending on the size and complexity of the home.

What are the main reasons for delays?

The most common reasons for extended build times are council delays in processing, material shortages, adverse weather, and availability of labour.

Is there a way to speed up the build?

Yes—using a straightforward design, gaining approvals upfront, and having a skilled builder can avoid delays.

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5. What’s a Realistic Timeline for Your Build?

While every project is different, here’s a general guideline:

• Standard new build – 6 to 12 months
• Custom-designed home – 12 to 18 months

If you’re planning to build a house in Nelson, it’s important to work with a builder who understands the local council requirements and potential challenges. This will help ensure your project stays on schedule and avoids unnecessary delays.

If you’re prepared to start designing your build, call us today for expert advice and a full project timeline or explore our new builds page.