Additions & House Extensions


For many Aucklanders, home is more than just a place to live. It’s where they raise their families and entertain their friends. 

But, as families grow and lives change, it is possible to overrun the space in your house.

If you are experiencing this difficulty, expansions and house extensions may be the solution. 

In this post, we’ll look at the advantages of expansions and house extensions in Auckland, as well as some pointers to get you started.

Use the best possible materials, and reveal the quality of those materials and the craftsmanship of their assembly.

Table of Contents


Single Storey House Extensions are built onto a part of the house and one or more sides of the house extension are attached to the house.

A well-designed and constructed side extension, if done well, will look and feel like a natural part of your home.

The addition of Single Storey House Extension can add value to your home in many ways. The following are a few ideas you can turn your Single Storey House Extension into:

  • New living area room, that has the potential to create an indoor-outdoor flow.
  • New bedroom(s).
  • New master bedroom and ensuite.
  • Kid’s playroom.
  • Extending to increase the size of the living space and installing a new kitchen. Typically, this option creates an open plan area that can be used as a combined kitchen, dining and living area.
  • Home office.
House Extensions Additions Renovation
Coatesville House Extension


A Second Storey House Extension can be built to add additional upstairs bedroom(s) or bathroom or even the creation of a living area with a living, ensuite and bedroom.

Building a Second Storey House Extension it’s more complex and the costs are higher than the single-story house extension.

The following are a few key areas to consider before you embark on your project;

  • You may need to consider privacy issues and ensure you are not encroaching on your neighbours. This would be considered during the design phase.
  • Going up usually means either taking the entire roof off or part of the roof off. This is dependent on the design and placement of the Second Storey House Extension.
  • Building a Second Storey House Extension means adding extra weight onto the existing house. You need to be sure your house can handle this additional weight.
  • You will also need to consider how your current floor plan will change. For example, space is required for a staircase.
  • Additional engineering costs both materials and engineer’s consultant fees. Need to be considered
cost of adding a second storey extension


During your planning stage, the following are a couple of items that you will need to consider;

  • The size of the house extension.
  • How the roof will work with the existing building roof line and its impact on the neighbours.
  • Other potential issues that may arise are the positions of current services such as stormwater, power and water mains line.
  • Hight to boundary considerations.


Building a house extension or addition to your house can provide you with the space and flexibility you need to improve your lifestyle and meet the changing demands of your family.

If you’re planning an addition or house expansion in Auckland, it’s critical to thoroughly plan your project.

For each addition/house extension project, we offer a full-service project management service that covers the entire design and build process – from the initial consultation to receiving the code of compliance (CCC).

Our project methodology which incorporates our 4 step process model will provide you with the best advice and guidance from our renovation team. This will help eliminate uncertainties and reduce your stress as you journey through your addition/extension project.

Renovations Project Management


  • What is the cost difference between a ground floor extension and second storey extension?
    Yes there is cost difference between building a ground floor extension and building a second storey extension. The difference is between 40 – 60%. This difference equates to the additional structural engineering and additional work that is required to accommodate a second level on your home.
  • What is the cost difference between a ground floor house extension and second storey house extension?
    Yes there is cost difference between building a ground floor house extension and building a second storey house extension. The difference is between 40 – 60%. This difference equates to the additional structural engineering and additional work that is required to accommodate a second level on your home.
  • How Long To Build A Second Storey House Extension?
    The time period of the completion of the second storey house extension build varies depending on the size and scope of the project. Style Plus Renovations North Shore Auckland have project management processes in place to ensure high levels of efficiency in completing each stage of a job and strive to meet deadlines as best as possible.
  • Do I need to have insurance arranged for my renovation?
    Yes, definitely. We cannot emphasise enough how important insurance is for your renovation project. Your budget should always include an allowance for building insurance to safeguard your investment. We recommend insurance being in place from day one for the sake of your project reaching its completion no matter what may happen as the process takes place.
  • Do I need a building consent for my house extension?
    Yes, structural work, additions, alterations to your home require a building consent. A building consent is written approval from the council to carry out specific building work on a specific site. Typically, you will require an architect and engineer to assist you with your building consent request for a house extension.

Get started with a Free
Architects Renovation Feasibility Report



Contact Us

Tell us about your renovation project and we’ll call you back for a no-obligation chat about your ideas.

Alternatively, if you prefer, we can initially set up a meeting using Microsoft Teams or Zoom (and other meeting apps) for a no-obligation chat about your ideas.

We look forward to hearing from you to discuss your project and get you started on your renovation journey.

If you would like to know more about our renovation process, check it out here.

contact us
Upload Your File (1MB Max)

Additional Requests

At Style Plus Renovations, we value your privacy.  We will not spam, sell or rent the information you have provided.