DTCE Consulting Engineers

30/10/2025

When a “simple” staircase becomes an engineering puzzle.

Architects and engineers know this feeling: a clean, minimalist design on paper that quickly turns into a spatial and structural balancing act once the real-world constraints show up.

This showcase project looked straightforward:
▪️ Three levels
▪️ Exposed steel and timber treads
▪️ Sleek glass balustrade

But once we got into the details, nothing was standard:
🔺 Every joint was visible.
🔺 Every connection had to be custom.
🔺 The available space left no room for a bulky structure.

We worked closely with the Steel Fabricator, Builder from JBL Builders Ltd, Architect from Clare Bush Architects, and Client to protect the design intent while ensuring every detail was practical and buildable.

It took a few iterations of design to arrive at solutions that met the project and structural needs.

The result - a staircase that looks effortless, because every hidden challenge was resolved through coordination and precision.

🔗 Read the full story here: https://www.dtce.co.nz/post/what-happens-when-a-seemingly-simple-staircase-brief-turns-into-a-complex-three-level-engineering-pu

01/10/2025

Wellington’s hills are beautiful and fragile.

Landslides aren’t just rare events: heavy rain and seismic activity make them a real risk for homes and developments. Still, many people don’t recognise the early signs until it’s too late.

Our latest blog explains:
🔹 What causes landslides in Wellington
🔹 Early warning signs to watch for
🔹 Practical steps to reduce risk

Whether you own a hillside property, are planning a development, or simply want to understand the risks in your neighbourhood, this guide brings together local experience and geotechnical knowledge.

Wellington’s steep hills and heavy rain make landslips a common risk for homeowners. Learn what causes landslides, the warning signs to watch for, and practical steps to prevent damage. We also explain how geotechnical reports help protect your property and when to contact insurers or the Natural ...

10/09/2025

Blending old and new isn’t always straightforward.

Working alongside Tennent Brown Architects Ltd, we developed structural solutions that supported their vision for a modern two-storey addition.

For this project, the challenge was adding a modern two-storey extension without overloading the existing house. Instead of reinforcing the old structure, we designed new supports that bypassed the original framing and took the load directly to new piles.

It’s a great example of how structural design can unlock architectural intent, creating bold contrasts while keeping the existing home safe.

🔗 Read the full story here:

The addition was designed to avoid loading the existing foundations, with new supports bypassing the existing wall framing and carrying the load directly down to new piles.

17/08/2025

Understanding Site Investigation Reports: What Wellington, Kāpiti Coast, and Wairarapa Homeowners Need to Know Before Building.

Your project’s success starts underground, literally. A beautiful set of architectural plans can unravel fast if the ground beneath them isn’t what you expected.

If you’re building or renovating in the Greater Wellington region, including Wellington City, the Kāpiti Coast, and the Wairarapa, a site investigation is one of the most important steps to get right before construction begins. Two sites just streets apart can have completely different ground conditions and completely different foundation requirements.

Local examples:

Khandallah – Solid greywacke rock just a metre down, ideal for shallow foundations.

Lyall Bay – Loose coastal sands with higher liquefaction risk, often needing deep piles or ground improvement.

The same building design in these two suburbs may require completely different solutions because of differences in bearing capacity, slope stability, liquefaction risk, and subsoil class.

What is a Site Investigation Report?
Also known as a geotechnical report, it examines the soil, rock, and groundwater conditions beneath your site. The findings guide foundation and retaining wall design, identify potential hazards, and support your building consent application.

Without accurate site data, foundations may be over-designed (adding unnecessary cost) or under-designed (increasing risk). In Greater Wellington, most councils require a geotechnical report for new builds, significant alterations, or sites with known hazards.

That’s why a site investigation isn’t just a consent requirement, it’s the foundation for a safe, efficient, and cost-effective build.

At DTCE Consulting Engineers, we bring geotechnical and structural expertise together so you get one seamless, practical, and localised solution: from first soil test to consent approval.

📄 Read our full guide here: https://www.dtce.co.nz/post/site-investigation-report

15/07/2025

❓ “Do I actually need a geotechnical report?”
This is a question that comes up often, usually from homeowners, architects, or developers just before submitting for building consent.

Geotechnical reports are often required for new builds and renovations in the Greater Wellington Region and sites near slopes or the coast.

They’re not just required for complex or high-risk sites. Councils also often request them for standard residential projects, especially in areas with soft soils, steep terrain, or known land movement.

We often see confusion around when a geotech report is actually needed, who requests it, and at what stage.

That’s why we’ve put together a short article. It outlines the key triggers that typically lead to a geotechnical assessment and helps clarify what to expect during the consent process. It’s a kind of practical insight we share with clients every day.

Read the full blog post here: https://www.dtce.co.nz/post/do-you-need-a-geotechnical-engineer-for-your-new-build-or-renovation