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 it’s a single room extension or a luxury custom new build, we’re home builders that guarantee high standard workmanship, smart planning and project completion within your budget.

– Anton Shipov, Builder & Founder

Customer Reviews

40 reviews on
Gerhard Lourens
Gerhard Lourens
Anton and his team combines efficiency, affordability, and quality seamlessly. Their approachability and dedication to ensuring customer satisfaction speak volumes about their work ethic. It's clear that they prioritize both the outcome of their work and the experience of their clients. Happy to recommend Red Square anytime.
Ross Worth
Ross Worth
When I first met Anton my upstairs deck replacement seemed quite daunting to me and a major job, but he re-assured me with his professionalism, his 'can do' approach and his friendliness. He initially helped me over the first hurdle by pointing me to a designer and whose plans were subsequently promptly approved by the Council. Red Square Construction have now completed the work and, in spite of some small hold-ups, Anton ensured the work progressed with minimum delay and that things were being done properly. Anton was always available for any concerns and was a pleasure to work with, as also were his team, and I now have a beautiful and solid new deck to enjoy for many years to come.
Margaret Ralston
Margaret Ralston
After researching several building companies I chose to go with Red Square Construction, Anton was prompt with his reply to my enquiry and on meeting him on site he was able to give me an outline of the work he thought would be appropriate and from that moment onwards I felt confident that I had made a good choice. Throughout the project I found Anton and his team to be punctual, polite and considerate while working around my home and causing as little inconvenience as possible. I am very pleased with the work carried out and the attention to detail, I will happily recommend to family and friends. Margaret Ralston
Judith Meakin
Judith Meakin
We are very happy to comment on and review the recent project carried out by Red Square Construction led by Anton Shipov. From the outset, Anton quickly understood what we envisioned. He managed the many changes we made with patience and helpful suggestions making the building experience pleasant. The project was completed within budget and on time. We would highly recommend Anton and.Red Square together with the subtrades who contributed to the build. Judith Meakin and Peter Larkin
Terry Ann Milligan
Terry Ann Milligan
We employed Red Square to build a deck and they did a fantastic job! Anton was very prompt, polite and professional with everything from the initial meeting right through to the final inspection. Although it was a simple deck, the only access was through the house via the kitchen and living room. Anton ensured there was good floor and carpet protection and his team were very respectful of our home, keeping their workspace tidy, creating as little mess and noise as possible and always keeping us informed on the various stages of the job. Throughout the process, Anton was always available to discuss any queries. They finished the job within the given time frame, stuck to the budget and cleaned up thoroughly afterwards leaving us to enjoy our new deck. We cannot fault them and will definitely be using Red Square again without question and can highly recommend them. Thank you Anton for a job well done!
Edward Smith
Edward Smith
We engaged Anton and his team to replace our rotting deck that was becoming an embarrassment. It was only a matter of time before someone fell through it. At first, we were a bit taken aback at his quote, but he was cheaper than the other guy and his obvious knowledge reassured us that we would be getting the better job anyway. Our deck was a large one and it had been well nailed, but was pine that had been laid wrong side up, without spaces to drain water. Watching them work, it became obvious why it cost a bit more than I had anticipated. It was a big job. Dismantling the deck, the rotting planks would break apart, few came away cleanly and easily. Rebuilding was more complicated. They had to sand every board checking for mold and rot, (not the new Kwila, of course), replacing what needed replacing, and levelling everything up. Removing all the nails from the joists, checking for rot, replacing what needed replacing and ensuring the joists were straight and level. They used screws instead of nails, a much more secure method. Cutting and laying the Kwila planks was an education. 24m x 130mm planks are not straight and required straightening as they were screwed down. Mounting them right side up meant they would now drain properly. They painted the ends of the planks with a waterproof coating before fitting them together. They made sure each angle, each join, was a perfect fit. The end result was a beautiful job, obviously done by a team of highly skilled proffessionals. Hopefully the photos do it justice. By the time they were done, I commented to Anton that I was amazed he could do such a big job, so well, for the price.
Mark Jones
Mark Jones
Anton and the team at Red Square are amazing to work with and deliver great results on time and to quoted budget. Everything about our small repair job went easily and according to schedule. A number of things really stuck out for us and made the Red Square experience one we would happily repeat and wholeheartedly endorse: Thinking with you, your requirements and budget – Anton had some great suggestions and alternatives to a design element we wanted. His ability to think outside of the box whilst still considering budget and practicality makes him a solid and reliable partner in realising the outcome you want. Anton’s friendly demeanour and easy way of communicating the scope and detail of the work in meaningful terms is testament to his professionalism. Attention to detail – Anton’s eye for a quality finish is second to none, if it’s not right, it will be. He treats each job as if it were being done in his own home and uses that lens to make sure you will look with satisfaction for years to come at the work delivered. Quality tradespeople – Good workmanship lies at the heart of any job. Anton’s core crew and the subcontractors he engaged were great; polite, skilled, efficient and cleaned up the job site after each visit so we could continue to use the space, meaning the impact to us was kept to a minimum. Clear and effective communication – Anton was very responsive to any query and made sure that subcontractors and team members communicated the timings of the scheduled activities to so we could plan around that. That helped immensely in making the best use of our time and reduced the stress of the unknown. We would happily choose Red Square again for renovation work knowing we are in safe hands.
Gareth Karrash
Gareth Karrash
Red Square is a very good company to deal with, Anton was very easy and clear to work with - Happy to do business anytime! Thanks!
Nick Pearce
Nick Pearce
Second time using Red Square and they remain highly recommended. Anton is great to work with and very clear on scope and pricing.
Zac Tippins
Zac Tippins
We worked alongside Red Square Construction on a recent project. Anton was a pleasure to work with and his teams workmanship was of the highest quality. I was so impressed I have request him to construct a deck at my home. I have no hesitation in recommending RSC.

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