How Much Does It Cost to Convert a Garage to a Granny Flat in Nelson?

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.