Buying an Elevator Maintenance Book: Due Diligence List

Published October 17, 2026 · Last updated October 17, 2026 · 10 min read

buying an elevator maintenance company

Buying Another Elevator Company's Maintenance Book: A Due Diligence and Migration Checklist

By Mr. Sujit Katariya, ElevatorPlus · Reviewed by Mr. Sumeet Katariya

In short: Buying an elevator maintenance company means buying units, agreements and records, not a customer list. Before closing, check which agreements can transfer, whether every unit has maintenance records, what the callback history shows, and which renewals fall in the first year. Send assignment, staff and tax questions to your attorney and accountant. After closing, write to every building owner on day one, load the data into its own branch, and get a mechanic to every unit within the first month.

Key takeaways

You are buying units and agreements, not names. Value sits in how many agreements transfer, have usable records and renew.
Ask for the records before the price is final. Per-unit records and 12 months of callbacks show the book's condition better than any summary.
Assignment is the first legal question. Whether each maintenance agreement can pass to you is for your attorney, agreement by agreement.
The first 30 days decide who stays. Building owners judge the new company by the first callback and the first maintenance visit.
Migrate into a separate branch first. Merge routes once the data is clean.

What this guide covers: what you are buying · the due diligence table · the records test · questions for your attorney and accountant · planning the migration before closing · the first 30 days · running the book as its own branch · a note for India · FAQs

What are you actually buying when you buy a maintenance book?

A maintenance book is a set of promises with equipment attached. You are buying six things, and the seller's spreadsheet usually describes only the first:

The customer and agreement list.
The units under those agreements, and their condition.
The records for each unit: maintenance visits, callbacks, tests and repairs.
The mechanics who know the routes and the buildings.
Parts on shelves and on trucks.
The relationships with building owners and property managers.

If you want the wider picture of what software should do once the book is yours, read What Is Elevator Service Software? A Straight Answer.

What should due diligence on an elevator maintenance book cover?

Work through this table before the price is final. Ask for every item in a file you can sort, not a printed report.

Area	Ask the seller for	What it tells you	Red flag
Agreements	Every active agreement, with dates, rate and units covered	Recurring revenue, and when it is at risk	Verbal arrangements with no paper
Agreement terms	Cancellation notice, escalation clause, term and any assignment clause	How easily a customer can leave after you buy	Short cancellation notice across most of the book
Renewals	Every agreement ending in the next 12 months	How much of the book you must re-sell in year one	A cluster of renewals in your first quarter
Units	Unit list with jurisdiction unit numbers, equipment type, controller and age	What parts and skills the book needs	Buildings listed without units
Maintenance records	Per-unit maintenance records for at least the last year	Whether the work was done and can be shown	Records kept as one notebook per mechanic
Callbacks	Every callback and entrapment in the last 12 months, by unit	Which units will cost you more than their rate	A handful of units carrying most of the callbacks
Inspection items	Open findings and upcoming tests by unit	Work you inherit on day one	Findings past their due date
Mechanics	Who services which route, and which buildings each knows	Whether the knowledge leaves with one person	One mechanic holding most of the book
Customer concentration	Agreements grouped by owner or property manager	How much one relationship controls	One manager holding a large share of units

The maintenance records row matters beyond the deal. If the book is under ASME A17.1, Section 8.6 calls for written maintenance records for each unit, kept for five years, and it permits electronic records. When you take over a unit, you take over keeping its records, so agree in the purchase terms what you will receive.

The records test: ten units, twelve months

Pick ten units at random from the seller's list. Ask for every maintenance visit and every callback on each one in the last 12 months.

Complete, dated records by unit mean the book was run on a system. Partial records, or records that need a call to a mechanic, mean you are buying units whose history you will have to rebuild. That work belongs in the price conversation.

Which questions belong to your attorney and accountant?

This is an operator's checklist, not legal or tax advice. Several questions decide what you actually own, and they need a professional who knows your state and your deal.

Question	Who answers it
Can each maintenance agreement be assigned to us, and does the customer need to consent?	Your attorney
Do any agreements have change-of-control or termination rights on a sale?	Your attorney
What happens to the seller's mechanics, and on what terms do they join us?	Your attorney
What licensing do we and our mechanics need in each jurisdiction in the book?	Your attorney
Who is responsible for work done before closing if a claim arises later?	Your attorney
How should the purchase be structured, and what is the tax treatment?	Your accountant
Who collects invoices that are open on the closing date?	Your accountant, with your attorney
How are prepaid agreements treated at closing?	Your accountant

Get these answers in writing before closing. The plan below depends on them.

How should you plan the migration before closing?

Plan the data before closing, while the seller still answers the phone. Agree in the purchase terms what data you receive, a test file before closing and the final file on closing day, and a named person on the seller's side to answer questions for the first few weeks.

Data to request	Format	Why you need it on day one
Customers and billing contacts	Spreadsheet or export file	Day-one letters and billing
Buildings and units, with unit IDs	Spreadsheet or export file	Every visit and callback attaches to a unit
Agreements with dates, rates and covered units	Spreadsheet or export file	Renewals and billing schedules
Maintenance records and checklists by unit	Export with attachments	Continuity of the record
Callback history by unit	Export file	Knowing which units will call first
Open inspection findings and upcoming tests	Spreadsheet	Work you inherit immediately
Access notes and site contacts	Spreadsheet, sent securely	Your mechanics need them on the first callback
Parts list with locations	Spreadsheet	Stock you now own

Then build one mapping sheet: the seller's field names against yours. Fix duplicate customers and units with no ID in the file before it is loaded. We cover the same cleanup in more depth in The Handover: Twenty Years of Paper Into a System.

What should happen in the first 30 days after closing?

Building owners chose the seller, not you, and the sale gives them a reason to look around. The first month is where you keep them.

When	Task	Output
Day 1	Send every building owner and property manager a letter: who you are, the new callback number, who their mechanic is	No customer hears about the sale second-hand
Days 1 to 7	Load the cleaned data, set up the acquired book as its own branch and train its team	Every unit and agreement in one system
Week 1	Put every mechanic from the acquired book on your app, on their existing routes	Visits and callbacks recorded from the first day
Week 1	Route all callbacks for the acquired book through your dispatch	One number, one queue
Week 2	Start maintenance visits on every unit, highest-callback units first	A first visit logged against every unit
Week 3	Compare units visited with units under agreement	Units you are paying for but not servicing, and the reverse
Week 4	List every agreement ending in the next 90 days and assign each to a person	A renewal call list with owners and dates

The week 3 comparison is where surprises appear: units maintained without an agreement, or agreements covering units nobody has visited. Each is a billing or a renewal conversation.

👉 Taking on a second book of business and want it visible on its own until it is clean? See how multi-branch elevator management works in ElevatorPlus →

Should the acquired book run as its own branch?

At first, yes. Merging an acquired book straight into your routes hides its problems inside your numbers. Run it as a separate branch for the first few months, so its callbacks, renewals and outstanding payments sit on their own against the figures you were shown in due diligence. Merge when the data is clean.

How does ElevatorPlus handle an acquired book?

Step	ElevatorPlus position
Data migration	Included in setup. Customers, units and agreements are imported, not re-keyed. For each agreement, setup brings in the contract signed date, services completed so far, services pending and the contract value. Anything else from the seller's files, such as old maintenance records, callback logs or access notes, goes into Important Documents, where the team on site can open it.
Time to live	Most customers are fully live within 2 to 7 days, with migration, configuration and team training included.
Separate branch	The acquired book can run as its own branch with its own clients, technicians, inventory and contracts.
Visibility	Branch managers see their branch, head office sees every branch, and field technicians see only their assigned jobs. Head office gets consolidated reports covering revenue, outstanding payments, technician utilization, callback volume and contract renewals, with drill-down to each branch.
Renewals	Renewal reminders 60 days, 30 days and 1 day before each agreement expires.
Checklists	Fully configurable checklists, set up aligned to the code you work under: ASME A17.1 in the US.
New mechanics	The technician app runs in 18 languages on Android and iOS. For international customers there is no per-user fee, and every module is included.
Accounting	Invoices stay in your own accounting software. ElevatorPlus logs every payment received and the next due date, and reminds your team when a collection follow-up is due.

Pricing is set per company after the Revenue Leak Walk-Through. For more, see elevator service software for US contractors.

A note for India: buying an AMC book

The same checklist works for an Indian lift company buying another company's AMC book, with two changes. The attorney and accountant questions still apply: take them to your lawyer and your chartered accountant.

First, lift law is set state by state. Each state may have a different Act, inspection interval and log book position, and Telangana has no lift Act in force at all. Check the state position for every city before you price the book. Our summary is Lift Rules by State in India: What 15 States Actually Require (2026).

Second, the renewal clock is the financial year. List every AMC ending before 31 March and treat that list as the first thing you must re-sell.

Frequently asked questions

1. What should I check before buying an elevator maintenance company?

The agreement list and terms, the units and their IDs, per-unit maintenance records, 12 months of callbacks, open inspection items, which mechanics know which routes, parts stock and how concentrated the customers are.

2. Can elevator maintenance agreements be transferred to a buyer?

It depends on each agreement's wording and the law that applies. Ask your attorney to review assignment and change-of-control terms agreement by agreement before closing.

3. What records should the seller hand over?

Every customer, unit, agreement, maintenance record, callback, open inspection finding, access note and part, in a structured file with attachments.

4. How do I keep customers after buying a maintenance book?

Write to every building owner on day one with the new callback number and their mechanic's name. Then make sure every unit gets a logged maintenance visit within the first month.

5. Should an acquired book be merged straight into existing routes?

Not at first. Run it as its own branch so its callbacks, renewals and payments are visible on their own, then merge once the data is clean.

6. How long does it take to move an acquired book into ElevatorPlus?

Most ElevatorPlus customers are fully live within 2 to 7 days, with data migration, configuration and team training included.

7. Does the same checklist work for buying a lift AMC book in India?

Yes, with the state lift Act checked for every city in the book, AMC renewals before 31 March listed first, and the legal questions taken to your lawyer and chartered accountant.

📲 Join our WhatsApp channel for compliance tips, updates: ElevatorPlus - Business Automation Tool

The price of a maintenance book is set on the agreement list. Its value is decided by the records, the callbacks and the first month after closing.

Run the ten-unit test before you agree the number. If the seller cannot produce a year of history on ten units, you are buying the job of rebuilding it.

After closing, speed beats polish. A letter on day one, one callback number and a mechanic at every unit within the month keep more customers than any discount.

👉 See how an acquired book would look as its own branch. Book the Revenue Leak Walk-Through →