Sustainability Vetting Guide
v1.0 · July 2026
A Guide for Developers, Designers & Organizations

How to Vet an Engineering Team on Sustainability

The questions that separate firms who genuinely practice sustainability from those who simply claim it — and what strong answers actually look like.

9 Areas · 45 Questions Max Score: 163 pts v1.0 · July 2026

The questions that reveal whether a company actually practices sustainability aren't obvious — unless you've spent years inside the work. Because while the vocabulary has become widely distributed, the practice hasn't.

Organized across nine areas of inquiry, this guide gives developers, designers, and organizations a structured framework for evaluating consultants — from the commitments they've signed and reported to, to their technical standards, and organizational signals that indicate whether sustainability is embedded in firm culture (or just carried by one person).

This guide is intended to help you make more informed decisions when hiring consultants, if your organization cares about forging partnerships with mission-aligned partners. It is a living resource. If you have suggested additions or questions about how to interpret an answer, reach out to Sarah Gudeman, PE, LEED Fellow.

Knockout questions are weighted 3× — a score of 0 on any Knockout triggers a flag regardless of total score. Important questions are weighted 2×. Context questions are weighted 1×. Score each question 0 (Weak), 1 (Partial), or 2 (Strong). See the Scoring Reference at the end for full criteria.

01 Industry Commitments & Accountability Commitments
02 Carbon Disclosure, Reporting & Own-Operations Accountability Transparency
03 Refrigerants & Embodied Carbon in MEP Systems Technical Practice
04 Ventilation, Indoor Air Quality & Occupant Health Indoor Environment
05 Energy Analysis & Performance Verification Data & Evidence
06 Credentials, Certification Experience & Organizational Designations Credentials
07 Electrification & Decarbonization Strategy Future-Readiness
08 DEI, Equity & Organizational Values Culture & Values
09 Firm Culture & Project Integration Culture

Performance Tiers

Any Knockout scored 0 triggers a flag regardless of total score. A flag requires explicit discussion before engagement — it does not automatically disqualify.

All KOs ✓
Minimum threshold to proceed on any project where sustainability is a stated goal.
≥ 96 pts (59%)
Strong — appropriate for LEED, WELL, or performance-based projects.
≥ 137 pts (85%)
Exceptional — peer-level practice; appropriate for LBC, zero carbon, or where sustainability is non-negotiable.

Red Flags in Answers

  • Citing LEED certification as proof of practice without naming the credits they led
  • "We comply with code" as the answer to any performance question
  • Can't name GWP values for the refrigerants they specify, or explain A2L classification
  • Claims MEP 2040 or AIA 2030 status but no Company Plan, no DDx reporting, no forum participation
  • Sustainability described as triggered by client request rather than a firm-wide default
  • Conflating energy efficiency with decarbonization — high-efficiency gas offered as a "sustainability" answer
  • No post-occupancy data, or unwillingness to discuss predicted vs. actual performance gaps
  • One sustainability champion in a large firm with no organizational infrastructure behind them
  • ESG report published without a named framework guiding methodology
  • Carbon offsets leading the conversation before direct reductions have been addressed

Green Signs in Answers

  • Unprompted mention of embodied carbon alongside operational carbon — understanding they require different strategies
  • Specific project examples with real EUI numbers and honest discussion of what didn't work
  • Active credentials distributed across the team, not concentrated in one person
  • EPD and low-GWP refrigerant spec language they can show immediately
  • WBLCA experience with access to embodied carbon benchmarking data
  • Familiarity with LEEDv5 with a concrete transition plan
  • A clear firm-wide electrification position that doesn't require a client to request it
  • Active participation in CLF, ASHRAE, MEP 2040 forums, or Living Future working groups
  • Post-occupancy tracking as standard practice, not an exception
  • JUST Label, B Corp, EcoVadis Silver or higher, or equivalent third-party ESG transparency
  • LEED Proven Provider or WELL EP designation — sustained, verified organizational performance
  • Their own office certified or formally benchmarked — they've been through the process themselves

Scoring Reference

This guide uses a weighted point system. Every question is scored 0–2, multiplied by question weight. The total provides a comparable benchmark across firms — but how you apply the tiers should reflect your project's sustainability ambition.

How Points Work

TypeWeightMax / Question
Knockout (7 questions)× 36 pts
Important (23 questions)× 24 pts
Context (14 questions)× 12 pts
Maximum Total163 pts

Score Definitions

2
StrongSpecific, verifiable, demonstrated with evidence. Can produce documentation on the spot — spec language, reports, post-occupancy data, policy documents. The claim is backed by the artifact.
1
PartialClaims compliance but the answer is vague, evidence is unavailable in the moment, or the firm is "working toward it." Correct directionally, incomplete in practice.
0
WeakNo; doesn't know; deflects; or the stated position contradicts the question. Includes "we do what the client asks" for commitment and electrification questions.

Performance Tiers

Tier
Points
Description
⚑ FlagAny KO = 0Knockout scored 0 regardless of total. Must be discussed and resolved before engagement on sustainability-integrated work.
Not Aligned< 65 ptsSustainability is not embedded in practice. Appropriate only for projects where sustainability is not a goal.
Developing65–95 ptsCommitments exist but practice is inconsistent. Suitable for low-sustainability-priority projects with active oversight.
Strong96–121 ptsConsistent practice across core areas. Appropriate for LEED, WELL, or performance-based projects.
Leading122–136 ptsAbove-average across technical, organizational, and cultural dimensions. Appropriate for net zero, high-performance, or complex portfolio work.
Exceptional137–162 ptsPeer-level practice. Appropriate for Living Building Challenge, zero carbon, or projects where sustainability is non-negotiable.

Knockout Flag Rules

There are 7 Knockout questions. Any Knockout scored 0 triggers a flag in the live scoreboard — regardless of total score. A flag means the evaluation should pause for an explicit conversation about that gap before engagement proceeds. A flagged firm can still be engaged on non-sustainability-critical work; the flag exists to prevent assumption-driven misalignment on projects where these commitments matter.

A Knockout scored 1 (Partial) does not trigger a flag but should be noted. It typically means the firm is on a credible path but hasn't fully implemented — worth a follow-up conversation, not automatic disqualification.

Knockout Criteria: What 0 / 1 / 2 Means for Each

KO 01 · Section 01
Are you a signatory of the MEP 2040 Commitment? Do you have a published Company Plan and participate in quarterly Forum sessions?
2
Strong: Signatory with a publicly accessible Company Plan; can show it immediately; active quarterly forum participation; EPD language already in template specs as a result of the commitment.
1
Partial: Signatory; Company Plan exists but is internal or incomplete; limited forum engagement; recently signed without full implementation underway.
0
Weak: Not a signatory; or claims to be without ability to verify; or signed but has no Company Plan and no forum participation.
KO 02 · Section 02
Do you quantify and disclose your Scope 1, 2, and 3 greenhouse gas emissions?
2
Strong: All three scopes quantified and publicly disclosed using GHG Protocol or equivalent; Scope 3 includes multiple categories beyond business travel (purchased goods/services, employee commuting, upstream leased assets); annual reporting cycle with named framework.
1
Partial: Scopes 1 and 2 tracked with quantified data; Scope 3 estimated for some categories or tracked but not publicly disclosed; or Scope 3 limited to business travel only.
0
Weak: Only Scope 1 and/or 2 tracked; no Scope 3 accounting; or no quantified GHG accounting at all.
KO 03 · Section 03
What is your standard practice for refrigerant specification? Are you actively specifying low-GWP refrigerants?
2
Strong: Updated template specifications default to low-GWP refrigerants on all projects; can show spec language immediately; can name current specified refrigerants with GWP values and articulate the A2L transition rationale; not waiting for client request.
1
Partial: Specifies low-GWP refrigerants on certification projects or when clients request it; no firm-wide default; can describe the approach but cannot immediately show spec language.
0
Weak: Defaults to legacy equipment without proactive GWP consideration; unaware of AIM Act implications for their specifications; or describes refrigerant selection as "whatever the equipment comes with."
KO 04 · Section 03
Do your specifications request EPDs for MEP equipment? Can you show us example spec language?
2
Strong: EPD language in template MEP specifications applied to all projects, not just certification work; can share the actual language on the spot; covers multiple equipment categories (HVAC, electrical, plumbing as appropriate).
1
Partial: Has included EPD language in some project specifications; can describe what it says but cannot immediately produce template language; applied inconsistently across project types.
0
Weak: Does not request EPDs; describes intent to but has no spec language; or limits EPD requests only to specific LEED credits.
KO 05 · Section 04
What is your standard of practice for ventilation calculations — prescriptive ASHRAE 62.1 compliance, or performance-based optimization?
2
Strong: Performance-based optimization is the firm's standard on all project types; uses DCV with clearly defined occupancy input methodology; ventilation interacts with energy modeling; goes beyond ASHRAE 62.1 prescriptive minimums as a default, not an exception.
1
Partial: Uses performance-based approaches on certification and high-performance projects; defaults to prescriptive compliance on standard work; DCV is applied when specified by the client or required by a certification program.
0
Weak: Prescriptive ASHRAE 62.1 compliance is the stated standard; cannot meaningfully distinguish between prescriptive and performance-based approaches; code compliance is the goal.
KO 06 · Section 05
What is your standard practice for energy analysis on your projects?
2
Strong: For integrated design firms — whole-building modeling begins at schematic design on all projects. For MEP/building science consultants — actively tracks building performance data, reports consistently to AIA 2030 DDx, and can show post-occupancy performance data for completed projects.
1
Partial: For integrated firms — modeling is standard on certification projects but not all; begins at CDs on standard work. For MEP consultants — DDx reporting is recent or partial; post-occupancy tracking inconsistent.
0
Weak: Energy modeling only when required by code or client request; for MEP consultants — no systematic tracking of building performance outcomes; cannot provide any post-occupancy energy data.
KO 07 · Section 07
What is your firm's default position on fossil fuel systems in new construction?
2
Strong: All-electric is the firm's documented default for new construction; can reference a policy or stated position; gas systems require written client request with documented rationale; firm proactively raises electrification in project discussions without waiting to be asked.
1
Partial: Firm recommends all-electric and does so when given the opportunity; no formal documented policy; gas systems evaluated on client request without requiring formal documentation; doesn't consistently initiate the conversation.
0
Weak: No stated position; evaluates gas vs. electric based solely on client preference or first cost; describes the choice as "the client decides"; or has not considered a firm position on this.

A Note on Section 06 — Credentials

Credential accumulation correlates with firm age and size. A five-person firm with five years of practice cannot be held to the same credential depth as a 100-person firm with 30 years of green building work. When evaluating Section 06, treat Context-level credential questions as relative benchmarks — ask whether the firm is investing in credentials that match their project scope, not whether they match an absolute count. The distribution of credentials across a team matters more than total numbers: one LEED Fellow carrying all sustainability weight for a 50-person firm is a red flag, not a green one.

Vetting Score
0/ 162 pts
0%of max
Not Started 0 / 44 answered