Professional Services Businesses for Sale in Illinois.
Whether you're looking at accounting, engineering, HR, or consulting, the firms worth buying share one quality: client relationships that belong to the team, not just the founder.
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$1.9M
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Featured Professional Services Businesses in Illinois
Showing 18 of 18 listings
Federal Engineering & Technology Consulting
Federal consulting firm with nearly two decades of government contract work, proprietary software including sustainment management systems for the Department of Defense, and a debt-free balance sheet generating $3.5M in revenue.
Price$1M
Revenue$3.5M
SDE$299.4K
Financial Healthcare Staffing Specialists
Professional staffing agency with over thirty-five years of operating history, 53% average markups on contingent placements, and client relationships spanning up to thirty years across financial services and nonclinical healthcare.
Price$750K
Revenue$2.8M
SDE$294.6K
Full-Service Commercial Print Shop
Over forty-five years of recurring client relationships and in-house production capabilities that 99% of competitors cannot match, generating $3.5M in revenue with the business operating independently of the owner for over six years.
Price$3M
Revenue$3.5M
EBITDA$700K
Specialized Product Design Firm
A product development consultancy with over thirty years of continuous operation, award-winning designs, and capabilities spanning ethnographic research through design-for-manufacturing across medical devices, consumer electronics, and commercial equipment.
Price$290.5K
Revenue$763.2K
SDE$153.7K
Telecom Permitting & Zoning Consultancy
Permit consulting firm operating across 25 states with multi-year MSAs from the three largest wireless tower owners, generating over $480k in SDE on a two-person team.
Price$2.2M
Revenue$864.4K
SDE$482.3K
Nonprofit Fundraising Strategy Consultancy
Nonprofit fundraising consultancy with over forty years of brand equity, a 300+ client track record, and retainer-based revenue driven almost entirely by referrals.
Price-
Revenue$735K
EBITDA$422.5K
Sales Training and Consulting Business
Revenue grew from $427k in 2023 to $677k in 2025, with SDE expanding from $150k to $348k over the same period. A sales training and consulting operation with built-in methodology and established brand recognition.
Price$950K
Revenue$677.4K
SDE$348.3K
Trust Property Management Services
Veteran-owned trust property management business serving 35+ trust companies across all 50 states, with 15+ years in a niche with few competitors and high barriers to entry.
Price$4M
Revenue$2.2M
SDE$317.8K
Technical Content Creation Agency
Technical content marketing agency building developer-focused content engines for B2B software companies, generating $1.3M in annual revenue through a fully remote, contractor-based model with minimal owner involvement in day-to-day production.
Price$800K
Revenue$1.2M
SDE$259.6K
Outsourced Call Handling Solutions
One of only two or three call-processing platforms in North America operating at the manufacturing level, serving over 1,000 clients with no single customer exceeding 3% of revenue.
Price$5.5M
Revenue$3.8M
SDEN/A
Custom Cars
Ford-authorized custom Bronco upfitter with five world auction records, 1M+ social media followers, and a proven path from direct-to-consumer builds into high-volume B2B dealership distribution.
Price-
Revenue$2.5M
EBITDA$400K
Industrial Workforce Staffing Solutions
Staffing operation serving food and beverage processing, light industrial, manufacturing, e-commerce, and clerical sectors with $73M in revenue, $5.5M in EBITDA, and top-15 clients averaging 12 years of tenure.
Price-
Revenue$73M
EBITDA$5.5M
Environmental Remediation Consulting Services
Environmental consulting firm with over 35 years of regulatory expertise, 50 ongoing projects, and an untapped metropolitan market that could more than double revenue.
Price$500K
Revenue$2.2M
SDE$143.1K
Web Development & Digital Solutions Agency
Drupal and WordPress support firm serving universities, nonprofits, and government organizations with SDE exceeding $300k in 2023 and 2024.
Price$750K
Revenue$797.3K
SDE$176.8K
Condo Lending Compliance Consultants
Over fifteen years of specialized condo compliance review work across twenty to thirty lender relationships nationwide, with recurring revenue cycles, limited direct competition, and high barriers to entry.
Price$810K
Revenue$430.4K
SDE$280.2K
Quantitative Analysis Consulting Firm
Over 200,000 books sold across nine languages generate a near-zero cost of sales pipeline for a quantitative consulting firm that operates with close to 50% margins and requires less than half a day per week from the owner.
Price$6M
Revenue$1.5M
SDE$600K
Talent Acquisition / Executive Search Firm
Finance and accounting executive search firm with 70%-plus placement rate and exclusive client relationships spanning over five years, delivering 60% margins on $500k revenue.
Price-
Revenue$500K
SDE$300K
Site Safety & Risk Management Company
Construction site safety and risk management consultancy delivering over 90% margins through a contractor-based model that scales from 10 to 99 field professionals per engagement.
Price-
Revenue$650K
SDE$600K
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Due diligence
What to Look For
Practical guidance from hundreds of real acquisition conversations.
Recurring vs. Project Revenue
- Ask the seller to break out what percentage of revenue renews automatically versus what has to be re-won each cycle.
- Retainer clients, annual contracts, and subscription-based engagements are worth more than one-time project work because they're predictable from day one.
- A firm where 50 percent or more of revenue is contracted and recurring is a strong starting point for your evaluation.
Who Owns the Client Relationships
- Ask for a list of clients with their assigned team member and how long each relationship has been managed that way.
- If every key client calls the founder when something goes wrong, that means real transition work for you and some client risk worth getting comfortable with early.
- Senior staff who have managed client accounts independently for years are what turn a services firm into a real asset.
Credentials and Licensing
- Ask which licenses or credentials are required for the business to operate and whether those are held by the owner or spread across the team.
- In auditing, engineering, and land management, a firm with multiple licensed professionals beyond the founder is in a much stronger position at transition.
- If the owner's departure would create a credentialing gap, that's worth understanding early and building into your plan.
Client Concentration
- Ask for a revenue breakdown by client and how long each major relationship has been active.
- Firms with five or more long-tenured clients each under 20 percent of revenue give you real resilience.
- The length of a client relationship often matters as much as the size when you're thinking about how durable the revenue is.
Documented Processes
- Ask whether the firm runs on documented workflows, project templates, and playbooks, or whether expertise primarily lives in people's heads.
- Firms with structured processes retain their value through an ownership transition much more reliably than those where everything is informal.
- Whether it's audit checklists, HR platform configurations, or engineering project templates, good documentation tells you the business can run without you recreating it from scratch.
Valuation
What Should You Expect to Pay?
2x-4x
SDE
Owner-operated, project-heavy or founder-dependent
4x-9x
EBITDA
Management team in place, strong recurring or contracted revenue
The spread across professional services categories is wide because owner-dependence and revenue predictability vary dramatically, from boutique consulting shops to self-running engineering firms with multi-year government contracts.
What drives a premium
Majority of revenue on recurring retainers, annual contracts, or software subscriptions
Licensed professionals on staff beyond the owner who can continue credentialed work post-sale
Senior team members with five-plus years of tenure independently managing client relationships
Revenue spread across ten or more clients with no single client above 20 percent of total
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Professional Services Businesses in Illinois
Four things tend to matter most: how much revenue is recurring versus one-time, who actually owns each client relationship, whether licensed or credentialed professionals beyond the founder will stay, and how spread out the client base is. Ask for a revenue breakdown by type, a list of clients with their tenure and assigned team member, and any signed contracts. Browse professional services businesses for sale on Rejigg to see how these firms present themselves to buyers.
Most professional services businesses sell for 2 to 9 times their annual profit depending on the category, revenue predictability, and team depth. Owner-operated firms where most work runs through the founder tend to sell in the 2 to 4x range. Firms with a management team, strong recurring revenue, and licensed staff can reach 6 to 9x. Use the SBA loan calculator to model monthly payments at different price points.
Start by asking what percentage of revenue renews automatically versus has to be re-won. Then look at who manages each major client relationship, the credentials and tenure of key staff, and how dependent the business is on the founder's personal relationships. Request the last three years of financials and a client list with revenue by account and assigned team member. The question worth spending the most time on is how well revenue would hold through a transition.
Good questions to start with: What percentage of revenue is on retainer or recurring contract versus project work? Who manages each major client relationship? Which staff hold professional licenses or credentials, and are those tied to individuals or the company? What is the average client tenure? Have any clients renewed within the past 12 months without being asked? These questions help you understand whether you're buying a real business or a job that runs through one person.
Rejigg is built specifically for buying and selling professional services businesses, including consulting, accounting, engineering, legal services, and HR firms. You can browse professional services businesses for sale on Rejigg, message sellers directly, and review financials in a secure deal room.
In fields like auditing, engineering, and land management, professional licenses are tied to individuals, not the company. If the founder is the only licensed professional, the buyer needs a plan for keeping that capability in place after the sale. The best situations are firms with multiple licensed staff members beyond the owner. Ask early who holds which licenses, which ones are required to operate, and whether those team members plan to stay.
Earn-outs are common in professional services for good reason. A structure tying 15 to 30 percent of the purchase price to client retention and revenue targets over the first 12 to 24 months keeps incentives aligned for both sides. It's also worth negotiating a transition period where the seller introduces you to key clients and stays involved on major accounts, typically 6 to 12 months. The goal is to give clients enough time to build trust with you before the prior owner fully steps away.