Virtual data rooms · Legal
What does a data room for a law firm merger cost?
Law firm combinations and practice acquisitions are shaped by professional-conduct rules on confidentiality and conflicts, which limit what client information can be shared and when.
Below: the transactions that use a data room in this sector and what goes into the room, in the words of regulators and advisers; what a room of that kind costs at every vendor that publishes prices; and the vendors whose own website names the sector.
Transactions that use a data room
- “Model Rule 1.17 governs the sale of a law practice and requires client notice, an opportunity to object, and cessation of practice in the sold area.” Acquisition Stars2026-09-22
- “Law firm combinations are governed by a distinct ethical framework that controls how clients are notified, how conflicts are resolved, how fees are divided” Acquisition Stars2026-09-22
- “Litigation funding occurs when a third party decides to fund a plaintiff to litigate against a defendant while retaining a financial stake in the litigation’s outcome” Haug Partners2026-09-22
What goes into the room
- “plaintiffs will commonly share confidential and privileged information with the funders.” Haug Partners2026-09-22
- “Plaintiff negotiated a litigation financing agreement with Hamilton Capital and shared e-mails and documents related to the diligence for the litigation funding.” Haug Partners2026-09-22
- “Tail malpractice coverage, IOLTA trust account succession, and file retention obligations require careful pre-closing coordination” Acquisition Stars2026-09-22
- “contact information for clients for whom the departing lawyer worked while at the firm, in order to determine conflicts of interests at the departing lawyer’s new firm” American Bar Association, Formal Opinion 4892026-09-22
Rules and standards that shape the room
- ABA Model Rule 1.6(b)(7) (conflicts disclosure on changes in firm ownership): ““to detect and resolve conflicts of interest arising from the lawyer’s change of employment or from changes in the composition or ownership of a firm” American Bar Association, Formal Opinion 4892026-09-22
- ABA Formal Opinion 09-455 (as summarised by NH Bar): “Disclosure must not compromise attorney-client privilege or otherwise prejudice a client or former client.” New Hampshire Bar Association2026-09-22
- Work product doctrine, Fed. R. Civ. P. 26(b)(3): “The issue that often arises is whether sharing confidential attorney-client communications or work product with non-party litigation funders constitutes a breach of confidentiality and thus a waiver of privilege” Haug Partners2026-09-22
- ABA Model Rule 1.17 (sale of law practice): “Conflict checks under Rules 1.7, 1.9, and 1.10 must occur before a combination is finalized, not after.” Acquisition Stars2026-09-22
The descriptions above are quoted from regulators, standard setters, law and accounting firms and industry bodies, with a link to each; none comes from a data room vendor. They describe common practice and are not a complete diligence list or legal advice for any transaction.
What a law firm merger data room costs
Totals use the lowest listed plan selected under the storage and admin-seat rules, on monthly billing where the vendor offers it. Vendors are listed alphabetically; the order is not a ranking. Plans are not matched on features.
A law firm merger or practice acquisition
Partnership agreements, financials, conflict-check data and client engagement terms, two admins, and a process of about half a year.
For a law firm merger or practice acquisition (15 GB, two admins, six months), published plans from 8 vendors cover the inputs at $528–$30K for the months billed on monthly billing where offered; 5 of them state that external viewers are free and unlimited and 7 state that monthly billing is offered.
| Vendor | Plan that fits | Total (US$) | Billed months | External viewers | Monthly billing | Sign-up |
|---|---|---|---|---|---|---|
 Ansarada | 15 GB | US$30,20415 GB plan | 6 | not stated on the pages checked | not stated on the pages checked | online, without contacting sales |
 CapLinked | Enterprise | Starting price only · Enterprise plan | 6 | stated as free and unlimited | offered | online, without contacting sales |
 Clinked | Virtual Data Room | Starting price only · Virtual Data Room plan | 6 | not stated on the pages checked | offered | online, without contacting sales |
 Digify | Team | US$3,000Team plan | 6 | not stated on the pages checked | offered | online, without contacting sales |
 Dillien | Standard (fixed monthly price) | US$4,158Standard (fixed monthly price) plan | 6 | stated as free and unlimited | offered | online, without contacting sales |
 DocSend | Advanced Data Rooms | US$1,800Advanced Data Rooms plan · last read 2026-08-27 | 6 | the vendor’s pages could not be read when checked | the vendor’s pages could not be read when checked | the vendor’s pages could not be read when checked |
 Drooms | Starter | No listed plan covers these inputs | 6 | count against the plan’s seats | offered | online, without contacting sales |
 FirmRoom | 10GB | US$10,47010GB plan | 6 | stated as free and unlimited | offered | online, without contacting sales |
 Fordata | LITE | US$19,371LITE plan | 6 | a stated quota per plan | offered | online, without contacting sales |
 Papermark | Data Rooms | US$1,033Data Rooms plan | 6 | stated as free and unlimited | offered | online, without contacting sales |
 Peony | Business | US$528Business plan | 6 | stated as free and unlimited | offered | online, without contacting sales |
 SecureDocs | 3 Month Plan | US$2,4003 Month Plan | 6 | stated as free and unlimited | not stated on the pages checked | online, without contacting sales |
 SmartRoom | Special pricing, per transaction | Listed price requires qualification · Special pricing, per transaction plan | — | not stated on the pages checked | not stated on the pages checked | a demo or sales contact is stated |
 Virtual Vaults | Basic | US$3,652Basic plan | 6 | stated as free and unlimited | offered | a demo or sales contact is stated |
The room inputs are illustrative and were fixed before any total was computed; no published source gives typical room sizes for this sector, and your room will differ. Prices are as published by each vendor on the date shown. Fit is decided on stated storage and admin seats only; security, features, support and suitability for any transaction are not assessed, and nothing here is a recommendation of any vendor.
Vendors whose website names the legal sector
- Ansarada: “Law Firms” Vendor site2026-09-21
- CapLinked: “Legal & Compliance” Vendor site2026-09-21
- Clinked: “Yes, Clinked is designed for businesses that need secure client collaboration, including industries such as finance, legal, healthcare, insurance, investment, and M&A.” Vendor site2026-09-21
- Datasite: “Law Firms” Vendor site2026-09-21
- DFIN Venue: “Advisors & Law Firms” Vendor site2026-09-21
- Digify: “Legal & Compliance” Vendor site2026-09-21
- Dillien: “Whether you work in real estate, biotech, finance, or law, you can set up a room in seconds” Vendor site2026-09-21
- DocSend: “Legal and Advisory” Vendor site2026-09-21
- Drooms: “Legal” Vendor site2026-09-21
- EthosData: “Legal and litigation” Vendor site2026-09-21
- Firmex: “Legal” Vendor site2026-09-21
- FirmRoom: “Legal & Compliance” Vendor site2026-09-21
- Intralinks: “Legal” Vendor site2026-09-21
- Papermark: “use Papermark virtual data rooms to securely manage confidential documents for M&A due diligence, fundraising, IPO preparation, litigation, and board governance.” Vendor site2026-09-21
- Peony: “The virtual data room (VDR) for M&A, finance, commercial real estate (CRE), healthcare, biotech, pharma, and legal teams” Vendor site2026-09-21
- ShareVault: “Legal Services” Vendor site2026-09-21
- SmartRoom: “Legal and Compliance” Vendor site2026-09-21
- Virtual Vaults: “Eliminate security risks and streamline the workflow of your legal team.” Vendor site2026-09-21
Each entry is that vendor’s own statement about itself, quoted with the page and date it was read. Being listed is not an endorsement and says nothing about how well a vendor serves the sector; a vendor that is not listed may still serve it.
More on data rooms
All vendor prices and profiles: how much a virtual data room costs. Features each vendor states: data room features. Other sectors: Biotech and pharma · Medical devices and healthcare · Real estate · Metals and mining · Oil, gas and energy · Renewables and infrastructure · Technology and software · Financial services · Manufacturing and industrials · Consumer and retail · Construction · Education · Legal · Government and public sector.