How to Sell an AE Firm or Engineering Firm (2026): Multiples, Buyers, & AEC M&A Playbook
Quick Answer
Christoph Totter · Managing Partner, CT Acquisitions
M&A advisory across 500+ active capital partners · AEC M&A: engineering, architecture, environmental · Updated June 6, 2026
If you plan to sell an AE firm (architecture and engineering) or engineering firm in 2026, a US engineering firm typically sells for roughly 5x to 13x EBITDA (per CT Acquisitions deal tiers), set by service-line mix, end-market exposure, backlog quality, and platform scale.
| Firm profile | EBITDA | Typical multiple |
|---|---|---|
| Single-office regional civil/structural | $1-3M | 5x-7x |
| Small multi-office, diversified service lines | $3-8M | 6x-9x |
| Mid-size multi-state, multi-discipline platform | $8-25M | 8x-11x |
| Premium scale: multi-state, federal/state DOT contracts, IIJA-aligned infrastructure | $25M+ | 10x-13x+ |
Infrastructure, water, environmental and transportation work earns a premium over commercial-only firms. Named buyers follow below.
Active buyers include Stantec (TSX: STN / NYSE: STN, $5B+ revenue Canadian-headquartered global AEC), Tetra Tech (NASDAQ: TTEK, $5B+ revenue, environmental and water focus), NV5 (acquired by Acuren in 2025, ~$900M revenue, multi-discipline), Bowman Consulting Group (NASDAQ: BWMN, ~$400M revenue, geospatial/transportation), Ardurra Group (PE-backed, infrastructure engineering, ~$500M revenue), Verdantas (The Sterling Group, ~$300M revenue, environmental and water), Olsson (private, large Midwest civil), Kimley-Horn (private/ESOP, large national civil), GHD (Australian, US infrastructure), IMEG (PE-backed, MEP), Salas O’Brien (PE/ESOP), Carollo Engineers, Fehr & Peers, plus PE-backed regional consolidators (The Sterling Group, J.F. Lehman, Stonepeak Infrastructure Partners, AEA Investors, Wind Point Partners, Riverside Company, Pinnacle Partners). The biggest multiple drivers are end-market mix (infrastructure / water / environmental / transportation premium to commercial; IIJA / BIL exposure is a tailwind), backlog quality and visibility, federal/state MSA contracts, licensed PE bench depth across disciplines and states, multi-state professional licensure footprint, and recurring services-revenue percentage. No fee to you on buy-side introductions; sell-side mandates are paid on success at closing.
If you own an engineering firm in 2026, civil, transportation, water/wastewater, environmental, geotechnical, structural, MEP, or multi-discipline, the M&A market is highly active. Stantec and Tetra Tech are the largest public AEC consolidators; NV5 was acquired by Acuren in 2025. Bowman Consulting Group went public in 2021 and continues to acquire. PE-backed platforms like Ardurra (~$500M revenue), Verdantas (Sterling Group, ~$300M revenue), IMEG, and Salas O’Brien continue rolling up regional firms. The IIJA / Bipartisan Infrastructure Law has been a tailwind for infrastructure-aligned firms.
What the asset is worth depends on three things: (1) end-market mix (infrastructure / water / environmental / transportation premium to commercial), (2) backlog quality and visibility (named federal/state MSA contracts), and (3) licensed-PE bench depth across disciplines and multi-state professional licensure footprint. This guide covers real multiples by profile, the named buyers transacting, and the operator-level diligence buyers will run.
This guide is about engineering firms (civil, transportation, water/wastewater, environmental, structural, MEP). If you operate a full architecture firm or design-build practice, see our separate guide at how to sell an architecture firm.
What this guide covers
- Engineering firm multiples 2026: 5x-7x EBITDA for single-office regional, 6x-9x for small multi-office diversified, 8x-11x for mid-size multi-state platforms, 10x-13x+ for premium scale with IIJA/BIL infrastructure exposure and federal/state MSA contracts.
- Active buyers: Stantec (TSX: STN/NYSE: STN, $5B+), Tetra Tech (NASDAQ: TTEK, $5B+), NV5 (acquired by Acuren in 2025, ~$900M), Bowman Consulting (NASDAQ: BWMN, ~$400M), Ardurra Group (PE-backed, ~$500M), Verdantas (Sterling Group, ~$300M), Olsson (private), Kimley-Horn (private/ESOP), GHD, IMEG (PE-backed), Salas O’Brien.
- PE sponsor activity: The Sterling Group (Verdantas), J.F. Lehman, Stonepeak Infrastructure Partners, AEA Investors, Wind Point Partners, Riverside Company, Pinnacle Partners, plus multiple infrastructure/environmental-services PE funds.
- Multiple drivers: infrastructure/water/environmental/transportation end-market exposure, IIJA/BIL alignment, backlog quality, federal/state MSA contracts, licensed-PE bench depth, multi-state licensure footprint, recurring services revenue.
- Things that compress the multiple: commercial-only end-market concentration, owner-PE dependence, single-client concentration above 20%, weak backlog visibility, single-state licensure, weak PE-bench succession.
- No fee to you on buy-side introductions; sell-side mandates are paid on success at closing.
Selling an engineering firm: the short answer. When you sell an engineering firm, the buyers are public AEC consolidators such as Stantec, Tetra Tech and Bowman Consulting Group, PE-backed platforms such as Ardurra, Verdantas, IMEG and Salas O’Brien, and PE sponsors rolling up regional firms. They look hardest at end-market mix (infrastructure, water, environmental and transportation work earns a premium over commercial), backlog quality and federal or state MSA contracts, and the depth of your licensed PE bench across disciplines and states.
How it works with us. A confidential first conversation, a buyer’s-eye read of value, then introductions to qualified buyers from our network of 500+ private equity firms, family offices, search funders and strategic acquirers. Nothing is listed publicly, and you decide whether to go ahead. No fee to you on buy-side introductions; sell-side mandates are paid on success at closing.
Named engineering firm M&A transactions (2021-2025)
CT Acquisitions · 2026 Buyer-Market Signal
What AEC Buyers Pay Premium For in 2026
Across our buy-side conversations with active AEC acquirers in 2026:
- Federal and infrastructure end-markets drive multi-turn premium. Operators with documented federal contracts (DOT, EPA, DOD) or infrastructure pipeline trade above pure commercial peers.
- Backlog quality (multi-year, take-or-pay) matters more than backlog scale. A $30M multi-year backlog beats a $50M one-year backlog at most buyer tables.
- Principal retention is the integration gate. Strong forward employment agreements with senior principals signed pre-LOI drive premium offers.
Multiple at a Glance · 2026
Engineering Firm Sale Multiples · 2026
By scale and end-market.
Source: CT Acquisitions analysis of AEC M&A. Stantec (STN), Tetra Tech (TTEK), NV5 (now Acuren), Bowman (BWMN), Ardurra, Verdantas + 25+ PE-backed AEC platforms.
Related Cluster GuideAdjacent professional-services vertical: see how consulting business valuation works in 2026.
| Target | Buyer | Year | What it tells us |
|---|---|---|---|
| Bowman Consulting Group IPO | Public market (NASDAQ: BWMN) | 2021 | Recent AEC IPO established public-market multiples; continues aggressive tuck-in M&A. |
| Multiple Stantec tuck-ins | Stantec (TSX: STN / NYSE: STN) | 2022-2025 | Global AEC public continues geographic and capability tuck-in M&A. |
| Tetra Tech regional tuck-ins | Tetra Tech (NASDAQ: TTEK) | 2022-2025 | Environmental/water leader continues consolidation; IIJA/BIL tailwind helping. |
| NV5 M&A, then sale to Acuren | NV5 (acquired by Acuren in 2025) | 2022-2025 | Multi-discipline AEC consolidator combined with Acuren in 2025. |
| Ardurra continued tuck-ins | PE-backed (multi-sponsor) | 2022-2025 | PE-backed infrastructure engineering platform continues regional rollups. |
| Verdantas growth via Sterling | The Sterling Group | 2022-2025 | PE-backed environmental/water consultancy continues regional rollups. |
How to Sell an AE Firm: Acquisitions and Active Buyers
To sell an AE firm, you run a targeted process to the active architecture and engineering acquirers, publicly traded roll-ups like Stantec, Tetra Tech, Acuren (NV5), and Bowman Consulting, plus PE-backed platforms such as Ardurra, Verdantas, IMEG, and Salas O’Brien. Firms with recurring client relationships, a licensed staff bench, and clean backlog command materially higher offers than owner-dependent single-office practices.
The AE acquisition market is consolidating fast. On the public side, Stantec (NYSE: STN), Tetra Tech (NASDAQ: TTEK), NV5 (acquired by Acuren in 2025), Bowman Consulting Group (NASDAQ: BWMN), WSP Global, and AECOM are all acquiring engineering practices to add geography, discipline depth, and licensed headcount. Each brings a different appetite, so knowing which buyer values your specialty is the difference between a low anchor and a competitive bid.
Private equity is the second engine. PE-backed platforms including Ardurra Group, Verdantas (The Sterling Group), IMEG, and Salas O’Brien roll up mid-market AE firms to build regional density, and sponsors like J.F. Lehman, Stonepeak Infrastructure Partners, AEA Investors, and Riverside Company sit behind them. ESOP and privately held firms such as Kimley-Horn, Olsson, and Burns & McDonnell round out the pool for principals who want a cultural fit over a pure financial exit.
When you sell an AE firm, the highest offers go to sellers who de-risk the deal before going to market: documented client concentration, a licensed second tier that survives the founder’s exit, and backlog that is contracted rather than pipeline. Run these buyers against each other in a structured process. If you want the seller-side playbook for a specific vertical, start with our sell your business guide.
The named buyer landscape
Public / strategic AEC buyers
- Stantec (TSX: STN / NYSE: STN, $5B+ revenue), Canadian-headquartered global AEC consolidator.
- Tetra Tech (NASDAQ: TTEK, $5B+ revenue), environmental and water specialty leader.
- NV5 (acquired by Acuren in 2025, ~$900M revenue), multi-discipline AEC.
- Bowman Consulting Group (NASDAQ: BWMN, ~$400M revenue), geospatial / transportation / land development engineering. IPO 2021.
- WSP Global (TSX: WSP), Canadian global AEC.
- AECOM (NYSE: ACM), selective US M&A.
PE-backed national platforms
- Ardurra Group (PE-backed, ~$500M revenue), infrastructure engineering.
- Verdantas (The Sterling Group, ~$300M revenue), environmental and water.
- IMEG (PE-backed), MEP engineering.
- Salas O’Brien (PE-backed/ESOP), MEP and consulting.
- Multiple PE-backed regional platforms across the US.
Private / ESOP-owned national firms
- Kimley-Horn (private/ESOP), large national civil engineering.
- Olsson (private), Midwest civil engineering.
- GHD (Australian), US infrastructure presence.
- Fehr & Peers, Burns & McDonnell (ESOP), HDR (ESOP), private/ESOP firms not active acquirers in their model.
PE sponsors active in this space
- The Sterling Group (Verdantas), J.F. Lehman, Stonepeak Infrastructure Partners, AEA Investors, Wind Point Partners, Riverside Company, Pinnacle Partners, plus multiple infrastructure/environmental-services PE funds.
What each buyer will pay for vs. what they reject
- Will pay premium for: infrastructure / water / environmental / transportation end-market mix, IIJA / BIL alignment, named federal MSA contracts (DOT, DOE, EPA, USACE, USGS, Army Corps), state DOT MSAs, strong backlog visibility (12-18 months forward), licensed PE bench across disciplines and states, multi-state professional licensure footprint, recurring services revenue (compliance, monitoring, water/wastewater operations).
- Will compress or reject: commercial-only end-market concentration without infrastructure exposure, owner-PE dependence, single-client concentration above 20%, weak backlog visibility, single-state licensure footprint, weak succession bench, undocumented PE-licensing, project-cost-overrun history, professional liability claim history.
The operator-level KPI playbook buyers will diligence
End-market and service-line mix
- End-market mix: Transportation %, water/wastewater %, environmental %, building structural %, MEP %, geotechnical %, land development %, commercial %.
- Public vs. private client mix: Federal, state DOT, municipal, private commercial, private residential.
- IIJA/BIL-aligned revenue: Document infrastructure-bill-tailwind revenue exposure.
- Recurring vs. project revenue: Compliance, monitoring, water/wastewater operations contracts.
Backlog and pipeline
- Backlog: Documented in months or dollars; 12-18 months forward visibility is the platform benchmark.
- Win rate: RFP/RFQ win rate by client type.
- Pipeline: Pursued opportunities, weighted by probability.
- Customer concentration: No single client above 20%.
Federal/state MSA contracts
- Federal MSAs: GSA schedule, DOT, USACE, EPA, DOE, USGS, etc.
- State DOT contracts: By state, with task-order count and history.
- Set-aside qualifications: SDB, HUBZone, WOSB, VOSB, 8(a) status if applicable.
Professional licensure
- PE count by state: Documented; multi-state coverage is a multiple-builder.
- PE bench depth: Tenure, age distribution, succession plan.
- Specialty discipline licenses: SE (structural engineer), PG (professional geologist), CCM (certified construction manager).
Project and financial KPIs
- Utilization: Billable hours / available hours; 65-78% is healthy for AEC.
- Realization: Billed vs. budgeted hours by project.
- Net multiplier: Net revenue / direct labor cost; 3.0+ is healthy.
- Project margin: Track by project, by service line.
- Days in AR: <75 days is healthy for AEC (longer than typical services).
Risk and insurance
- Professional liability claim history: 5-year claim history; documented and resolved.
- Insurance coverage limits: PE&O coverage levels documented.
- Project risk-management protocols.
Dangers and traps in engineering firm M&A
1. Commercial-only end-market concentration
Premium multiples come from infrastructure / water / environmental / transportation. Commercial-only firms compress.
2. Owner-PE dependence
If the founder/principal PE is the rainmaker for top clients, build the BD and succession bench.
3. Single-client concentration
Above 20% single-client concentration is repriced.
4. Weak backlog visibility
12-18 months forward backlog visibility is the benchmark.
5. Single-state licensure
Multi-state PE licensure is a multiple-builder.
6. Professional liability claim history
Repeated claims raise project-risk-management questions.
7. Federal/state MSA contract loss risk
If a major MSA is up for renewal during the sale process, that creates uncertainty.
8. Equity-rollover expectations
PE-AEC deals often include 20-40% equity rollover for selling PEs/principals. Understand the dynamics before LOI.
Our POV on engineering firm M&A in 2026
- Single-office regional firms ($1-3M EBITDA) go 5x-7x.
- Small multi-office diversified firms ($3-8M EBITDA) go 6x-9x EBITDA.
- Mid-size multi-state platforms ($8-25M EBITDA) are highly leveraged. 8x-11x.
- Premium scale platforms ($25M+ EBITDA, multi-state, IIJA/BIL aligned, federal/state MSA contracts) reach 10x-13x+.
The right time to prepare is 12-18 months before going to market, build the federal/state MSA contract base, develop infrastructure/water/environmental specialty mix, document backlog and pipeline, expand multi-state PE licensure, and build the succession bench.
Selling an AE firm to employees or an ESOP instead of an outside buyer
Not every AE firm owner sells to a consolidator. Structure magazine’s guide to selling an engineering business names three buyer groups: other engineering companies, key employees, and outside individuals. Many firm principals also look at an employee stock ownership plan (ESOP). Each path trades price, speed, and control differently.
| Path | Price and payment | What it suits |
|---|---|---|
| Outside buyer (strategic or PE platform) | Usually the highest headline price, with most cash at close plus any rollover or earnout | Owners who want liquidity and a defined exit date |
| Internal sale to key employees | Usually a lower price, paid over years from firm cash flow through a seller note or staged buyout | Firms with a ready second tier and an owner willing to be paid over time |
| ESOP | Capped at fair market value set by an independent appraiser, funded by bank debt and seller notes | Owners who want to keep the firm independent and reward staff |
Internal transitions keep the culture and client relationships intact, but your payout depends on how the firm performs after you step back. They take years to plan, because the next owners need time to build both the client relationships and the capital to buy you out.
ESOPs can carry a tax advantage. Under IRC Section 1042, owners of a C corporation who sell to an ESOP that holds at least 30% of the company after the sale can defer capital gains tax by reinvesting in qualified securities. The trade-off is cost and complexity: an ESOP needs a trustee, an annual valuation, and ongoing administration.
State licensure shapes every path. An engineering firm needs licensed professionals in responsible charge in each state where it practices, and some states limit ownership by people who are not licensed. Check those rules before you pick a buyer type, because they can rule out a structure late in the process.
Many owners run the comparison by getting an outside valuation first. A credible outside offer also sets a fair reference price for an internal or ESOP deal.
Preparing your engineering firm for sale: 12-18 months out
- Get multi-year audited or reviewed financials. Track revenue by service line, client type, contract.
- Build infrastructure / water / environmental specialty exposure.
- Lock in federal/state MSA contracts. Multi-year task-order base.
- Document backlog and pipeline. 12-18 months forward visibility.
- Expand multi-state PE licensure.
- Build the succession bench. Reduce founder/principal-PE dependence.
- Resolve professional liability matters.
- Document KPIs. Utilization, realization, net multiplier, project margin.
- Run a competitive process. Stantec, Tetra Tech, Acuren (NV5), Bowman, Ardurra, Verdantas (Sterling), IMEG, Salas O’Brien, plus PE sponsors (Sterling, J.F. Lehman, Stonepeak, AEA, Wind Point, Riverside).
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Frequently asked questions
Who buys AE firms?
Public roll-ups (Stantec, Tetra Tech, Acuren (NV5), Bowman Consulting, WSP, AECOM), PE-backed platforms (Ardurra, Verdantas, IMEG, Salas O’Brien), and privately held or ESOP firms (Kimley-Horn, Olsson, Burns & McDonnell) all acquire architecture and engineering practices. The right buyer depends on your discipline mix and geography.
How do I sell an engineering firm?
To sell an engineering or AE firm, run a confidential process with strategic acquirers and PE-backed platforms consolidating the sector. Buyers weigh backlog, recurring client relationships, licensed and credentialed staff retention, project mix, and owner dependence. Engineering firms typically trade at 5x to 8x EBITDA, with diversified, backlog-rich firms and strong second-tier leadership at the high end.
What is the typical multiple for an engineering firm in 2026?
Single-office regional firms ($1-3M EBITDA) go 5x-7x EBITDA. Small multi-office diversified firms ($3-8M EBITDA) go 6x-9x. Mid-size multi-state platforms ($8-25M EBITDA) go 8x-11x. Premium scale platforms ($25M+ EBITDA, IIJA/BIL aligned, federal/state MSA contracts) reach 10x-13x+.
Who are the active buyers of engineering firms right now?
Public/strategic: Stantec (TSX: STN / NYSE: STN, $5B+ revenue), Tetra Tech (NASDAQ: TTEK, $5B+, environmental/water), NV5 (acquired by Acuren in 2025, ~$900M), Bowman Consulting Group (NASDAQ: BWMN, ~$400M, IPO 2021), WSP Global (TSX: WSP), AECOM (NYSE: ACM). PE-backed: Ardurra Group (~$500M), Verdantas (Sterling Group, ~$300M, environmental/water), IMEG (MEP), Salas O’Brien (MEP). Private/ESOP: Kimley-Horn, Olsson. PE sponsors: The Sterling Group, J.F. Lehman, Stonepeak Infrastructure Partners, AEA Investors, Wind Point Partners, Riverside Company.
What hurts an engineering firm’s valuation most?
Commercial-only end-market concentration without infrastructure exposure, owner-PE dependence with weak succession bench, single-client concentration above 20%, weak backlog visibility, single-state professional licensure, repeated professional liability claims, project-cost-overrun history, and major federal/state MSA contracts up for renewal during sale process.
Why is IIJA / BIL infrastructure alignment so important?
The Infrastructure Investment and Jobs Act (IIJA, also known as the Bipartisan Infrastructure Law / BIL) drove significant infrastructure spending from 2022 onward. Engineering firms with named exposure to federal infrastructure programs (DOT, USACE, EPA, DOE) and state DOT MSAs capture material multi-year revenue uplift. Buyers price IIJA/BIL exposure into multiples.
What is the typical equity-rollover structure in engineering firm M&A?
PE-backed and strategic acquisitions of engineering firms often include 20-40% equity rollover for the selling principals / lead PEs. The rollover equity participates in the next platform exit, but understanding the rollover valuation, dilution dynamics, and second-sale terms is critical before signing an LOI.
Do I have to pay a broker fee?
It depends on the mandate. CT Strategic Partners works both sides of the table and is not a business broker. When a buyer from our network approaches you through a buy-side search, you pay no fee; when you hire us to run a sell-side process, we are paid on success at closing, with terms agreed in writing before any work starts.
How long does it take to sell an engineering firm?
Once you go to market with an M&A advisor, a typical process runs 6-9 months from initial outreach to closing. Add 12-18 months of preparation work before going to market.
When should I start preparing if I plan to sell in 2027 or 2028?
12-18 months before going to market is the right window. Highest-leverage pre-sale work: build infrastructure / water / environmental specialty exposure, lock in federal/state MSA contracts, expand multi-state PE licensure, build succession bench, and document backlog/pipeline.
Can I sell my engineering firm to my employees?
Yes. Owners sell to key employees directly, usually paid over several years through a seller note, or to an employee stock ownership plan funded by bank debt and seller notes. Both keep the firm independent, but the price is usually lower or paid more slowly than in a sale to an outside buyer. Start planning years ahead so the next owners are ready.
Can a one-person engineering firm be sold?
It can, but buyers pay mostly for transferable clients, contracts, and licensed staff, and a one-person firm has little of that apart from the owner. Most sales of very small firms are client-list or practice transfers to a nearby firm, often with the owner staying on for a transition period. Documented repeat clients and open contracts improve what a buyer will pay.
Related research
- How to sell an architecture firm
- Which industries is PE buying most in 2026
- Private equity value creation
- Business broker alternative
- Sell your business (overview)
- How to sell an environmental services company
- How to sell an industrial services business
- How to sell a water treatment business
- How to sell a solar installation business
- Strategic buyer vs financial buyer
Owners weighing DIY versus full-service representation should read our broker economics for sellers.
About the Author
Christoph Totter is the founder of CT Acquisitions, an M&A advisory firm working both sides of the table, headquartered in Sheridan, Wyoming. We work directly with 500+ buyers, search funders, family offices, lower middle-market PE, and strategic consolidators, including direct mandates with the largest home services consolidators that other intermediaries can’t access. No fee to you on buy-side introductions; sell-side mandates are paid on success at closing. Connect on LinkedIn · Get in touch
