Company lists · Data refreshed September 2026

Top 25 Subsurface analysis companies based in New Zealand

Name: Subsurface analysis companies based in New Zealand
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 136 companies tracked

RevenueBase identified 136 subsurface analysis companies headquartered in New Zealand as of September 2026 and tracks 2,856 professional contacts across them, including 1,792 with verified work emails. Auckland is the largest hub.

This list covers subsurface analysis companies headquartered in New Zealand, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

136Companies

2,856Contacts tracked

1,792Verified emails

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The 25 largest subsurface analysis companies based in New Zealand

Ranked by team size

Top 25 of 136 subsurface analysis companies based in New Zealand, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to subsurface analysis companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Tonkin Taylor	Indirect evidence	Auckland Central, New ZealandHQ checked Sep 19, 2026	1,001-5,000	958 contacts →
	Indirect evidence “At Tonkin + Taylor, we’re dedicated to creating and sustaining a better world together.” Source: RevenueBase Database · checked Sep 19, 2026
2	Geotechnics LTD	Indirect evidence	Onehunga, New ZealandHQ checked Sep 19, 2026	51-200	129 contacts →
	Indirect evidence “Geotechnics is a civil engineering testing company, offering a diversified suite of testing services and testing products.” Source: RevenueBase Database · checked Sep 19, 2026
3	Engeo NZ & AU	Indirect evidence	Christchurch, New ZealandHQ checked Sep 19, 2026	51-200	121 contacts →
	Indirect evidence “ENGEO Ltd (formally Geoscience Consulting) is a specialist consultancy group providing Engineering Geological, Geophysical, Environmental and Geotechnical Engineering services.” Source: RevenueBase Database · checked Sep 19, 2026
4	Riley Consultants	Indirect evidence	Takapuna, New ZealandHQ checked Sep 19, 2026	51-200	84 contacts →
	Indirect evidence “Our company has evolved from humble yet visionary origins to become the multi-disciplinary consultancy it is today.” Source: RevenueBase Database · checked Sep 19, 2026
5	LDE Engineers Scientists	Indirect evidence	Gisborne, New ZealandHQ checked Sep 19, 2026	51-200	81 contacts →
	Indirect evidence “LDE are specialists in geotechnical, civil, environmental and structural engineering.” Source: RevenueBase Database · checked Sep 19, 2026
6	Fraser Thomas LTD	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	51-200	77 contacts →
	Indirect evidence “Fraser Thomas is a Multi-Disciplinary, client focused consulting firm specialising in resource management, engineering and surveying.” Source: RevenueBase Database · checked Sep 19, 2026
7	Davis Ogilvie	Indirect evidence	Christchurch, New ZealandHQ checked Sep 19, 2026	51-200	69 contacts →
	Indirect evidence “Davis Ogilvie (DO) is a trusted multidisciplinary engineering consultancy in the South Island with an unwavering commitment to the region, its communities and the environment.” Source: RevenueBase Database · checked Sep 19, 2026
8	Silvester Clark Consulting Engineers	Indirect evidence	Pipitea, New ZealandHQ checked Sep 19, 2026	51-200	62 contacts →
	Indirect evidence “Silvester Clark Consulting Engineers is a New Zealand-owned structural engineering firm, delivering expert services since 1979.” Source: RevenueBase Database · checked Sep 19, 2026
9	RDCL	Indirect evidence	Hastings, New ZealandHQ checked Sep 19, 2026	11-50	44 contacts →
	Indirect evidence “RDCL is a world class team of geotechnical and geophysical specialists providing innovative and expert solutions.” Source: RevenueBase Database · checked Sep 19, 2026
10	GWE Consulting Engineers	Indirect evidence	Takapuna, New ZealandHQ checked Sep 19, 2026	11-50	43 contacts →
	Indirect evidence “GWE Consulting Engineers is a multi-disciplinary engineering consultancy providing geotechnical, civil and water, environmental, wastewater and stormwater engineering services and…” Source: RevenueBase Database · checked Sep 19, 2026
11	Cook Costello	Indirect evidence	Whangarei, New ZealandHQ checked Sep 19, 2026	11-50	40 contacts →
	Indirect evidence “Cook Costello is a New Zealand multidisciplinary engineering consultancy working across geotechnical, civil and structural engineering, geophysics, land surveying, land…” Source: RevenueBase Database · checked Sep 19, 2026
12	Geosolve LTD	Indirect evidence	South Dunedin, New ZealandHQ checked Sep 19, 2026	11-50	39 contacts →
	Indirect evidence “At GeoSolve we understand the importance of managing geological risk, and our specialist knowledge and proven track record means we can provide practical resilient solutions…” Source: RevenueBase Database · checked Sep 19, 2026
13	EDC	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	11-50	39 contacts →
	Indirect evidence “Who We Are With offices in Auckland, Christchurch and Whakatane, multi-disciplined Engineering Design Consultants (EDC) are your answer to all things engineering.// What We Do EDC…” Source: RevenueBase Database · checked Sep 19, 2026
14	March Construction LTD	Indirect evidence	Christchurch, New ZealandHQ checked Sep 19, 2026	51-200	39 contacts →
	Indirect evidence “March Construction brings together the geotechnical and water infrastructure expertise, which when combined with the micro-tunnelling expertise of our sister company Rob Carr…” Source: RevenueBase Database · checked Sep 19, 2026
15	Contech	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	51-200	38 contacts →
	Indirect evidence “Contech is New Zealand’s leading specialist civil engineering company in concrete construction and remediation.” Source: RevenueBase Database · checked Sep 19, 2026
16	Initia	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	11-50	33 contacts →
	Indirect evidence “Initia is a specialist geotechnical engineering consultancy that provides design, advisory and construction observation services for building, infrastructure and earthworks…” Source: RevenueBase Database · checked Sep 19, 2026
17	Abseil Access LTD	Indirect evidence	Wellington, New ZealandHQ checked Sep 19, 2026	51-200	32 contacts →
	Indirect evidence “Abseil Access aims to assist in the improvement of New Zealand's infrastructure and give the public access to some of the most remarkable landscapes possible via our bespoke…” Source: RevenueBase Database · checked Sep 19, 2026
18	HD GEO	Indirect evidence	Hamilton, New ZealandHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “We are specialists in geotechnical engineering and land and water contamination.” Source: RevenueBase Database · checked Sep 19, 2026
19	Plaxis Geotechnical Analysis	Indirect evidence	Christchurch, New ZealandHQ checked Sep 19, 2026	501-1,000	29 contacts →
	Indirect evidence “Understand the underground and solve complex geotechnical challenges with Seequent's PLAXIS technology.” Source: RevenueBase Database · checked Sep 19, 2026
20	Soil & Rock Consultants	Indirect evidence	Henderson, New ZealandHQ checked Sep 19, 2026	51-200	28 contacts →
	Indirect evidence “With a rich legacy spanning over three decades, Soil & Rock Consultants stand at the forefront of the geotechnical, environmental, civil, and geological engineering landscape in…” Source: RevenueBase Database · checked Sep 19, 2026
21	NAL Civil & Structural Engineers Limited	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “About Us: NAL Civil & Structural Engineers Limited is a multi-disciplinary engineering consultancy specialising in a broad range of civil infrastructure and building projects.” Source: RevenueBase Database · checked Sep 19, 2026
22	Rock Control	Indirect evidence	Christchurch, New ZealandHQ checked Sep 19, 2026	11-50	26 contacts →
	Indirect evidence “Rock Control are ground engineering specialists with a firm focus on construction drilling.” Source: RevenueBase Database · checked Sep 19, 2026
23	Wilton Joubert - Geotech	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	51-200	23 contacts →
	Indirect evidence “Geotechnical Engineering, and Engineering Geology, including Site Investigations, Earthworks Supervision and Control, Expansive Soils, Dynamic Probing, Foundation & Retaining Wall…” Source: RevenueBase Database · checked Sep 19, 2026
24	EGL Engineering Geology Limited	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Engineering Geology Ltd (EGL) is a professional consultancy practice specialising in geotechnical and earthquake engineering and engineering geology.” Source: RevenueBase Database · checked Sep 19, 2026
25	Grouting Services	Indirect evidence	Auckland, New ZealandHQ checked Sep 19, 2026	51-200	19 contacts →
	Indirect evidence “We provide a full range of specialist construction services in the fields of ground anchoring, soil nailing, post-tensioning, drilling and grouting.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: subsurface analysis companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names subsurface analysis companies.
Partial evidence: Its own public description names part of subsurface analysis companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsurface analysis companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 136 subsurface analysis companies based in New Zealand

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Subsurface analysis companies based in New Zealand at a glance

As of Sep 19, 2026

62.7%Verified-email coverage

21.0Average contacts per company

11-50Median size (employees)

32.4%Largest-city concentration · Auckland

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for New Zealand, so it is reported there. Company counts and contact totals on this page are exact for New Zealand, over 136 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among subsurface analysis companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in New Zealand whose own description of what they do matches “subsurface analysis companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names subsurface analysis companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among subsurface analysis companies, and records with no verified work email. Companies headquartered outside New Zealand are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 1,792 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Subsurface analysis companies by metro

Subsurface analysis companies in Auckland44
Subsurface analysis companies in Christchurch25

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names subsurface analysis companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many subsurface analysis companies are there based in New Zealand?

RevenueBase identified 136 subsurface analysis companies headquartered in New Zealand as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Tonkin Taylor, headquartered in Auckland, tops this list with the largest team on record.

Which city has the most subsurface analysis companies?

Auckland leads with 44 headquartered companies, followed by Christchurch (25) and Wellington (10).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,792 verified decision-maker contacts tracked across these 136 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.