Company lists · Data refreshed September 2026
Top 25 Carbon neutral contractors based in Singapore
RevenueBase identified 105 carbon neutral contractors headquartered in Singapore as of September 2026 and tracks 2,116 professional contacts across them, including 311 with verified work emails. Singapore is the largest hub.
This list covers carbon neutral contractors headquartered in Singapore, 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 16, 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.
The 25 largest carbon neutral contractors based in Singapore
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 558 contacts → | ||||
Indirect evidence “ONG & ONG is a holistic 360 design solution consultancy excelling in infrastructure, education, commercial and high-density living.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 2 | 167 contacts → | ||||
Indirect evidence “Sunkonnect is a leading energy transition and renewable energy consulting company delivering end-to-end engineering, quality assurance, project management consultancy, and…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 3 | 64 contacts → | ||||
Indirect evidence “Bescon Consulting Engineers Pte is an award-winning Mechanical and Electrical (M&E) Consultancy firm providing Professional Engineering Services for building and infrastructure…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 4 | 59 contacts → | ||||
Indirect evidence “ID21 is a leading design and build agency specialising in the delivery of high-quality, future-ready interior environments for commercial, institutional, retail and community…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 5 | 59 contacts → | ||||
Indirect evidence “Building System & Diagnostics, or BSD as we like to call ourselves, started off in 2003 as a spin-off company of the National University of Singapore (NUS).” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 6 | 56 contacts → | ||||
Indirect evidence “ID Architects is a multi-faceted architectural practice, based in Singapore that brings a unique and valuable blend of expertise for its valued customers.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 7 | 51 contacts → | ||||
Indirect evidence “We believe that when clients choose us, they often make decisions based on our people.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 8 | 43 contacts → | ||||
Indirect evidence “Vector Green is a Singapore-based energy and sustainability engineering firm helping organisations plan and implement practical energy transition solutions.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 9 | 41 contacts → | ||||
Indirect evidence “DCA Architects is a Singaporean architecture firm established in 1996 as a partnership, which was later incorporated in 1998.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 10 | 41 contacts → | ||||
Indirect evidence “Since its inception on December 29, 1982, HY has established itself as an indomitable force in Mechanical and Electrical (M&E) Engineering Consultancy, with a remarkable track…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 11 | 40 contacts → | ||||
Indirect evidence “TEMBUSU Asia Consulting derives its name from the Tembusu – a large evergreen tree in the family Gentianaceae which is native to Southeast Asia.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 12 | 36 contacts → | ||||
Indirect evidence “Architect, builder and consultant.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 13 | 31 contacts → | ||||
Indirect evidence “I3 Solutions Group is now part of Ramboll.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 14 | 31 contacts → | ||||
Indirect evidence “We're here to create a more sustainable world.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 15 | 30 contacts → | ||||
Indirect evidence “Synthesising and realising our client's vision into innovative and buildable solutions runs through and deep in every member of Sterling.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 16 | 25 contacts → | ||||
Indirect evidence “IGnesis is an established multi-disciplinary engineering consultancy firm in the fields of mechanical & electrical, Fire Safety & Risk Engineering, Environmental Sustainable…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 17 | 22 contacts → | ||||
Indirect evidence “We started as Squire Beca in 1977, a small partnership between Raglan Squire & Partners and New Zealand-based Beca Carter.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 18 | 18 contacts → | ||||
Indirect evidence “EFC, derived from Environmental First Corporation, embodies our core purpose of empowering sustainability excellence for a better world.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 19 | 17 contacts → | ||||
Indirect evidence “Pomeroy Studio are an award-winning international team of designers and thought leaders of sustainable built environments.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 20 | 6 contacts → | ||||
Indirect evidence “Estes Consultancy is a Singapore-based sustainability consultancy firm dedicated to green solutions.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 21 | 5 contacts → | ||||
Indirect evidence “At Ampersand, our mission is to offer a comprehensive and seamless design-and-build experience that truly aligns with our clients' unique requirements.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 22 | 5 contacts → | ||||
Indirect evidence “Earth-In-Mind is committed to sustainable design, in line with the worldwide green movement.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 contacts → | ||||
Indirect evidence “We support our clients in reaching sustainable development goals by developing and implementing projects pursuing sound environmental management, climate action, clean water and…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 24 | 4 contacts → | ||||
Indirect evidence “With 30 years market experience, ONE CONCEPT provides one-stop contractual services.” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
| 25 | 4 contacts → | ||||
Indirect evidence “SPREAD - Strategic Platform for Reducing Emissions & Accelerating Decarbonisation Mitigation and Adaptation: We help clients reduce their greenhouse gas emissions and adapt to the…” Source: RevenueBase Database · checked Sep 16, 2026Thanks. The Data Team will review it. | |||||
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: carbon neutral contractors. 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 carbon neutral contractors.
- Partial evidence
- Its own public description names part of carbon neutral contractors, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name carbon neutral contractors. 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 105 carbon neutral contractors based in Singapore
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Carbon neutral contractors based in Singapore at a glance
As of Sep 16, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Singapore, so it is reported there. Company counts and contact totals on this page are exact for Singapore, over 105 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 carbon neutral contractors, 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 Singapore whose own description of what they do matches “carbon neutral contractors”. 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 carbon neutral contractors), 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 carbon neutral contractors, and records with no verified work email. Companies headquartered outside Singapore 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, 311 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 16, 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.
Carbon neutral contractors by metro
- Carbon neutral contractors in Singapore94
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 carbon neutral contractors, 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 carbon neutral contractors are there based in Singapore?
RevenueBase identified 105 carbon neutral contractors headquartered in Singapore 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?
Ong&ong PTE LTD, headquartered in Singapore, tops this list with the largest team on record.
Which city has the most carbon neutral contractors?
Singapore leads with 94 headquartered companies, followed by Downtown Core (2) and Jurong East (1).
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 311 verified decision-maker contacts tracked across these 105 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 16, 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.
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