Engineering
for NZ / AU.
Code-compliant structural and architectural designs for NZ (NZBC) and Australia (NCC): pole sheds, framed buildings, light gauge steel, PS1, and building consent packages. Delivered remotely, wherever your site is.
2100+
Projects
116+
Clients
1700+
NZ Designs
6+
Years
What We Do
Engineering
Services
Full-scope structural and architectural engineering for New Zealand and Australia. From brief to building consent, delivered remotely.
Full Services →Kitset Shop
Buy an engineered shed kit online
Choose a design, order online, and we prepare your consent-ready structural documentation.

Harrison — Kitset Garage & Carport
9 × 6 m domestic garage with an open carport bay and store partition.
$750

Ngatea — Kitset Implement Shed & Lockup
13.5 × 9 m farm implement shed with two open bays and a lockup.
$750

Rangiora — Kitset Lifestyle Shed & Lean-To
12 m main shed with an attached 4 m mono lean-to. Two buildings.
$750
How It Works
From Brief to Building Consent
Share your brief
Site address, structure type, dimensions, timeline. We handle the rest.
We design & calculate
Full structural analysis to NZBC / NZ Standards or, for Australia, NCC / Australian Standards.
Receive your package
Drawings, calculations, specifications, and PS1. Ready for council submission.
Client Feedback
What Clients Say
"Used Defteng for the structural engineering on our timber framed home build in Richmond. They were patient with our questions, the documentation was easy for our builder to follow, and pricing was a lot more reasonable than the quotes we got from local consultants. Happy to use them again on future projects."
Rachel Davies
Owner, Nelson
Davies Construction
"Engaged Defteng for FrameCAD detailing on a light gauge project and the quality of work itself was decent, but the delivery dates kept slipping - first by a few days, then again closer to the deadline, which threw out our fabrication schedule. Would've appreciated more upfront heads-up rather than finding out close to the due date each time. The technical side was fine, it's really the timeline management that needs work."
Dave Henderson
Director, Auckland
Henderson Light Gauge Construction
"First job with Defteng was a mixed bag, to be honest. The actual drawings were fine once they arrived, but we were quoted a one-week turnaround for the pole shed plans and ended up waiting closer to two and a half weeks with not much communication in between. Had to chase a couple of times to get an update. Might give them another go but I'd build in extra time if you're on a tight schedule."
Greg Sullivan
Owner, Manawatu
Sullivan Sheds & Fencing
"I've referred a couple of clients to Defteng for timber pole shed engineering and structural drafting, and so far feedback's been positive - drawings are detailed, calculations are sound, and they're responsive when council asks for amendments. Good option for smaller rural builds that still need proper engineering sign-off."
Olivia Carter
Building Consultant, Wellington
Carter & Associates
"Got Defteng to do the framing layouts and structural details for a residential timber frame build in Pirongia. They picked up a few things our previous drafter had missed, which honestly saved us a headache down the line. Communication was good and they were flexible with our revisions."
Mark Thompson
Director, Hamilton
Thompson Timber Frames Ltd
"We've used Defteng's estimation team for a couple of light gauge steel projects using FrameCAD, and the takeoffs were spot on - saved us a lot of back-and-forth with suppliers. They clearly know FrameCAD inside out, which isn't always easy to find from an offshore provider."
Hannah Wells
Estimator, Tauranga
Coastline Construction Group
"Been doing pole sheds for years and usually outsource the engineering locally, but a mate recommended Defteng for a bigger shed that needed proper PS1 documentation. The calcs were thorough, the drawings were exactly what our building consent officer wanted, and pricing was fair. No complaints from me."
Tom Robertson
Owner, Otago
Robertson Sheds & Structures
"Our residential timber-framed job in Rolleston needed a fast structural review after a design change, and Defteng turned it around within days. The engineer we dealt with actually understood NZS 3604 requirements, which made the whole back-and-forth so much smoother. Good communication despite the time difference."
Sarah Mitchell
Project Manager, Christchurch
BuildRight Construction
"We brought Defteng in for the structural drawings on a run of timber pole sheds out near Cambridge, and honestly it took a load off our plate. The drafting was clean, council didn't come back with a single query, and turnaround was quicker than what we'd been getting locally. Will be using them again on the next batch."
James Patterson
Director, Waikato
Patterson Rural Builders
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We aim to reply within one business day. No obligation, no jargon. Just engineering.