How Much Does It Cost to Build a Granny Flat in Rolleston? – Canterbury Cottages

Thinking about adding a granny flat to your Rolleston property? Whether it’s for extra space, a rental opportunity, or a home for the in-laws, it’s a smart move. But the big question is… how much does it actually cost?

Granny Flat Prices in Rolleston: What to Expect

The cost of building a granny flat varies depending on size, materials, and level of finish. But to give you a ballpark:

Basic, one-bedroom granny flat (built on-site): From $96K-$120K
Two-bedroom granny flat (more space, better specs): From $130K–$165K+
Fully custom or high-spec granny flat (designer touches, high-end materials): $200K+

These prices are based on Canterbury Cottage prices and we offer extremely competitive rates for second dwellings, other companies you may find a bit of a jump in price. We can keep costs down because we are the ones who build the granny flats (rather than contracting a third-party builder) and we offer the option to build on-site (no need to transport the cottage to your place). The prices include foundations, framing, roofing, plumbing, and electrical. You can view our standard specifications and inclusions sheet here.

What Affects the Cost?

Size & Layout – More bedrooms, bigger living areas, or fancy designs = higher cost.
Site Prep & Services – If your section needs extra work (like leveling or drainage), expect to pay more.
Building Materials – Standard weatherboard vs. architectural cladding? There’s a price difference.
Consent & Council Costs – Building consents, resource consents, and compliance fees, if any.
Extras & Upgrades – Want a deck, high-end kitchen, or premium insulation? It all adds to the final bill.

Hidden Costs to Watch For

Connection fees – Power, water, and sewerage hookups aren’t always included in base prices.
Driveway & Landscaping – Not always top of mind but can add $1K–$20K+.
Furniture & Appliances – If you’re renting it out, you’ll need the essentials.

Is a Granny Flat Worth It?

Absolutely! Rolleston is growing fast, and adding a granny flat can increase your property value, create extra income, or give family members a space of their own. Plus, with rental demand on the rise, it’s a solid long-term investment.

Thinking About Building One?

At Canterbury Cottages, we specialise in building high-quality, fully compliant granny flats in Rolleston. Whether you’re after a small, functional space or a fully self-contained home, we’ve got options to suit your budget.

Want to chat about your project? Get in touch today, and let’s get planning!