House Extensions

Quality home extensions that enhace the enjoyment and value of your home.

Common home extensions include second storey extensions, kitchen extensions, room extensions, loft conversions, extending house to garage and more. Smart planning and management, transparent costing and strong client builder communication are essential to completing home extensions to a high standard and within budget.

Key points for a successful home extension

Shared vision for the home extension

Guarantee to stay within budget

Ensure the consent process is managed correctly

Professional management from design to build

Clear and transparent communication

Whether itโ€™s a single room extension or a luxury custom new build, weโ€™re home builders that guarantee high standard workmanship, smart planning and project completion within your budget.

โ€“ Anton Shipov, Builder & Founder

Customer Reviews

27 reviews on
Kerry Inskeep
Kerry Inskeep
Anton of Red Square Construction; repaired 2 damaged ceilings in my home. He managed the project efficiently & professionally throughout. His builder & his plasterer/ painter were obviously well skilled in their work & took a real pride in their finished product. I certainly would recommend this firm without reservation & will be using their services again. Kerry Inskeep.
Mike Willis
Mike Willis
Have to say wow! Amazing effort put in over three days of on and off rain to get our backyard project finished. Boxed, filled and paved our patio / BBQ area in quick time. Anton is very organised and his workers are very efficient. Stoked with the result!! Would recommend to any of our friends.
Maureen Malabanan
Maureen Malabanan
I have always dreamed of a beautiful backyard since we bought our house 8 years ago. After a few consultation with Anton, we have finally decided to go ahead with our project. Anton is so easy to deal with and very professional. He has given us a few options depending on our budget. We are so pleased with the result and would definitely use Red Square Construction for all our future renovations. Very good workmanship and quality. Thank you very much again ๐Ÿ™‚
Andre Chaltsev
Andre Chaltsev
A great company to deal with. We worked on a laundry project together with Anton. Would definitely recommend Red Square Construction!
Sandy Pardon
Sandy Pardon
Red Square built a pool deck for us and fixed posts on an outdoor retaining wall, Anton and his team are excellent to deal with and do a wonderful job, going beyond what the job entails for a very professional service.
Jen Trask
Jen Trask
We were very impressed with the prompt professonal service that we received, and the work was completed to an extremely high standard. We can not fault the work, service, or the professional friendly manner that we received. Thank you Anton. We highly recommend this company to others.
Michelle Court
Michelle Court
Anton and his team were awesome, they were punctual, kept me informed, friendly and they did a great job. Antonis honest, a great problem solver and listener. I will continue to use his services in the future. Thanks Anton! ๐Ÿ˜Š
Bob McMillan
Bob McMillan
Very thorough, polite and professional, coming in on budget, with very high quality work resulting - could not recommend Anton and his team more highly
Erin Richards
Erin Richards
Great team and awesome work. Old house with wonky walls, old fences, deck and more. Anton and his team were professional, very tidy and in and out with no fuss. Unforeseen issues discussed and being a single female I appreciated his honesty, different ideas and patience with my endless questions. Thank you Red Square, I will see you again!

house extensions

Home Extensions

Design & Planning

Structural Engineering

Professional Roofing

Second Storey Extensions & Additions

Finished to the Highest Standard

Home extensions can be a cost effective way to add improve the liveability and value of your existing home.

House extension projects can get complex so we pay special attention to the planning and estimate stage to make sure your investment gets delivered to the highest standard within your timeframe and budget – guaranteed.

House extension construction with building wrap

home extensions

Auckland home extensions done right

End to end project management

Qualified in building and structural engineering

Guaranteeed built to a high standard

Advice on the consent process and building standards

Clear communication and advice

Qualified builders and engineers bring reliable management and construction to your house extension.

Red Square has the knowledge and expertise in construction management and civil engineering to make your dream home extension both a reality and a positive experience!

Call us to discuss your extension project at any stage.

house extensions

Home extension costs

Single room extension approx $4000 per sqm.

Garage extension approx $3000-$4000 per sqm.

Ground floor extension $2500-$4000 per sqm.

2nd storey extension $3500-$5000 per sqm.

Basement conversion approx $1500-$4000 per sqm.

Garage conversion $1500-$4000 per sqm.

These rates can help give you an idea of the cost of your planned house extension.

The cost of a house extension depends on the type of extension and can be approximated on a cost per square meter basis.

Rates given are for the base building cost, and generally exclude costs of local authority fees, external works, and utilities, as these will vary for each situation.

An experienced builder should bring clarity to the known and potential costs early in the design and planning stages of your build.

House extension construction with building wrap

house extensions

2nd Story Extensions

We design, engineer & build

Can work positively with your designers, architects or engineers

Licenced builders

Qualified civil engineer

Guarantee to stay within budget

A second floor extension / 2nd storey addition is an exciting project that can add great livability and value to the existing home.

Good planning and the right team are essential for a successful no-hassle build.

We value the right choice of materials and design to appropriately complement and add real value to the existing home.

The approximate basic build cost of a second-storey extension is $3500 – $5000 per sqm.

Read about one of our double-storey extension and alteration projects here.

house extensions

Ground floor “single-storey” and rear house extensions.

End to end management or work with your team

Ground floor bedroom extensions

Rear house extension for bedrooms (or kitchens)

Bungalow back extensions

Extensions on sloping properties

Single-storey or rear house extensions are the most cost effective way to add indoor space to your home.

Successful extensions begin with an experienced review of the section, logistics and foundation requirements.

We can engage from any stage of design or build.

Read about one of our ground-floor house extension projects here.

Garage sleep out extension in Auckland

house extensions

Garage extensions

Smart material and design choices to complement your home

High standard groundwork and foundations

Lead by a civil engineer and licensed builder

Transparent costings and guaranteed to stay in budget

Double-storey garage extensions

The Auckland climate begs for an internal garage. A quality custom garage extension can add both function and style to the existing home. We put special emphasis on the design and planning phase to ensure the best material and design choices.

We can take your garage extension project end to end or work with your designer and architect to successfully complete the build.

We guarantee to stay within your budget, and value good communication and a clear understanding of costs.

Read about one of our garage house extension projects here.

Interested in having a chat?

Reach out to our main office and we will respond to you shortly.

Case Studies

Auckland House Extension

Ground Floor Extension