You love the house. You just need more of it. We design an extra room that feels like it was always there.
You have outgrown the house, but not the street or the way the afternoon sun lands in the lounge. Moving means losing that. Adding on keeps it, and lets the house grow with you.
When you search for house extension architects in Dunedin, you will find a confusing mix of registered architects, group builders, and design studios. We can help simplify things for you. The Eco Workshop team is composed of LBP Design 2-accredited architectural designers. The licence allows our designers to handle the structural and weather-tight parts of a home, among others. The studio designs house extensions across Dunedin and Otago.
In short: a house extension adds room to the home you already have instead of replacing it, and on most Dunedin sites, the hard part is not the new space but how it integrates with the old house. The Eco Workshop team handles design, building consent, and the council back-and-forth for single-storey, double-storey, and rear extensions. You do not need a registered architect for most residential work. You need someone licensed to design restricted building work, which is what LBP Design 2 covers. What it costs depends on the extension’s size and how much of the existing structure you touch. You get a written fee proposal before you commit, and the first meeting is free.
Thinking about starting that extension? Call (03) 455 1505 or message us through our contact page, and we will come and look at your place. The first meeting is on us.
For most house extensions in Dunedin, you do not need a registered architect, just someone licensed to design the parts that keep your home standing and dry.
Restricted building work covers the structural and weathertight elements of a house, and under MBIE’s building practitioner rules it must be designed or supervised by a licensed building practitioner. Separately, the Registered Architects Act 2005 protects the title “Architect”, so only someone registered with the New Zealand Registered Architects Board may use it. An architectural designer with LBP Design 2 can design your extension, usually at a more accessible fee than a registered practice, with the same consent-ready drawings.
When you’re searching for a house extension designer or home extension architect, what you actually need is a licensed designer who can take your project from initial idea through to approved plans. Someone who handles the technical drawings, council submissions, and sign-offs so you don’t have to.
An extension succeeds or fails where it joins the house. How the new space connects to the existing dwelling, how light moves between old and new, how the house holds warmth: these matter more than the floor plan alone.
The fact is, many villas and bungalows were never built to stay warm, and a careless addition can bolt a cold box onto a cold house. BRANZ research found that over half of New Zealand homes could benefit from retrofit insulation, with up to 35 percent of heat lost through an uninsulated roof. An extension is the moment to fix that, increasing the whole home’s comfort, not just its floor area.
The details that decide whether an addition feels original or bolted-on:
You can see that approach across the project gallery, including work like the Valley Extension.
Your section decides the right type of extension. Site coverage, boundary setbacks, and height limits often set the shape before design begins, and the Dunedin City Council planning team assesses those limits during its consent process. On a tight site you may also need resource consent (the council’s approval under the district plan) if the extension exceeds permitted site coverage or height to boundary.
Here is how the three common options compare.
| Single-storey extension | Double-storey extension | Rear extension | |
|---|---|---|---|
| Best for | Extra living space, a bedroom, or a home office on the ground floor. | Adding bedrooms above without using more of the section. | Opening the kitchen and living room to the garden. |
| Site considerations | Uses site coverage and needs room on the section. | Saves site coverage but tests height-to-boundary limits. | Often least visible from the street and works well for heritage frontages. |
| Watch for | How it shades the existing house and garden. | Stair position and structural load on the original house. | Drainage and how the new floor level meets the old. |
None of these is automatically cheaper: a modest double-storey addition can cost less than a sprawling single-storey one, because it uses less foundation and roof. During the four-stage design process, the team works through which option suits your site, budget, and family.
Book a Free First Meeting
Bring a rough sketch, saved photos, or a problem you want solved. We’ll walk you through what your site allows and the likely cost. No obligation, no pressure. Call (03) 455 1505 or contact us online.
Most house extensions need building consent, and some also need resource consent. Getting the drawings right the first time keeps the timeline short.
A building consent is the council’s confirmation that your design meets the New Zealand Building Code. Dunedin City Council routes each application through its planning, engineering, 3Waters, building and drainage, and transportation teams, and the Council’s 20-working-day timeline for review and approval starts only once the application is accepted as complete. Mostly it runs to time: MBIE’s data shows 94.5 percent of applications nationally cleared within the statutory timeframe in late 2025, at a median of 10 working days.
Around 64 percent of applications draw a Request for Further Information, or RFI, the council asking for something missing or unclear. An RFI resets the Council’s review timeline until you answer it, so a fortnight on paper can stretch to two months. Complete, coordinated drawings are the best defence. The Eco Workshop team prepares and lodges the full set, then handles any RFIs that comes back, so you are not left decoding council language alone.
For most residential extensions, no. You need a licensed building practitioner to design the restricted building work, the structural, and weathertight part. Eco Workshop’s designers hold LBP Design 2 accreditation and design house extensions across Dunedin and Otago.
Almost always. An extension that adds floor area or alters structure needs a building consent from the Dunedin City Council, and some sites also need a resource consent under the district plan. The team confirms which consents your project needs before any design locks in.
It depends on the extension’s size and how much of the existing house you change. A simple rear extension costs far less than a double-storey addition that reworks the structure. Rather than quote a misleading figure, the team gives a written fee proposal up front, and our house extension guide walks through what drives the numbers.
It comes down to how much of your section you can build on and your height-to-boundary limits. Single-storey is simpler but uses site coverage. Double-storey keeps the footprint small but tests height limits and needs careful structural work on the existing house. Your first meeting settles what your site allows.
Through deliberate detailing: matching floor levels, carrying the roofline through, choosing cladding that suits the original, and planning how light and circulation flow between old and new. Done well, the connection to the existing dwelling is the part nobody notices, because the addition feels like it always belonged.
Thinking about adding on? Most Dunedin extensions live or die on how well they handle the existing house: how the new space connects, how the light works, how it holds up against a southerly. That’s the part Eco Workshop loves. Give us a call and we’ll come and have a look. No charge for the first meeting, no pressure to commit.
Call (03) 455 1505 | Visit 31e Stafford Street, Dunedin | Send us a message
Still working out your pathway?