Coverage description
An Insurance Services Office (ISO) standard form. It adds architects, engineers and surveyors you engage as additional insureds for injury or damage caused by your acts at your premises or in your ongoing operations, excluding their professional services and capping their coverage at what the contract requires.
How the form has changed
4 changes across 2 revisions, newest first. Each edition is compared with the one before it, using wording from filed copies.
12 19 edition
Dec 2019, compared with 04 13Latest editionThe cap on the additional insured's limits now refers to the applicable limits of insurance rather than only the limits shown in the Declarations.
04 13
“Available under the applicable Limits of Insurance shown in the Declarations”
12 19
“Available under the applicable limits of insurance; whichever is less”
04 13 edition
Apr 2013, compared with 07 04Coverage for the additional insured now applies only to the extent permitted by law and is no broader than the contract requires.
07 04
Not in this edition
04 13
“will not be broader than that which you are required by the contract or agreement to provide”
When a contract requires the coverage, the most paid for the additional insured is the lesser of the contract requirement or the available limits.
07 04
Not in this edition
04 13
“the most we will pay on behalf of the additional insured is the amount of insurance”
The professional services exclusion now also applies when claims allege negligent supervision, hiring, training or monitoring of others.
07 04
Not in this edition
04 13
“allege negligence or other wrongdoing in the supervision, hiring, employment, training or monitoring of others”
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 12 19Dec 2019Latest | 94 | 60 | 28 | Nov 2021 to Oct 2026 |
| 04 13Apr 2013 | 19 | 18 | 7 | Dec 2021 to Oct 2026 |
| 07 04Jul 2004 | 5 | 3 | 5 | Feb 2023 to Mar 2024 |
1 other edition date appears in one or two filings each, often carrier-specific versions: 01 96.
Where filings record what this form replaced, they name earlier edition 04 13. Only some filings record replacements.
What the filings show
- Edition in use: in the past 12 months, 21 companies filed the 12 19 edition and 7 companies filed 04 13.
- CG 20 07 (Additional Insured - Engineers, Architects or Surveyors) is filed alongside it most often, in 113 of the same filings (98%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings. One filing can cover several affiliated companies.
Carriers filing this form
The 10 carrier groups with the most filings that include CG 20 31, out of 40 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Cincinnati Financial Group3 group companies filed it, led by The Cincinnati Casualty Company and The Cincinnati Indemnity Company | 16 | 16 | 12 19 | Oct 23, 2023 |
| Markel Corporation Group2 group companies filed it, led by State National Insurance Company, Inc. and Markel Insurance Company | 9 | 4 | 12 1904 1307 04 | Oct 22, 2026 |
| Nationwide Corporation Group7 group companies filed it, led by Allied Insurance Company of America and Nationwide Insurance Company of America | 8 | 3 | 04 1312 19 | Feb 12, 2025 |
| Tokio Marine Holdings Incorporated Group4 group companies filed it, led by Safety National Casualty Corporation and TNUS Insurance Company | 8 | 2 | 12 19 | Feb 17, 2026 |
| Sompo GroupSompo America Insurance Company | 7 | 2 | 12 19 | Jun 18, 2026 |
| Grange Mutual CAS Group3 group companies filed it, led by Grange Indemnity Insurance Company and Grange Insurance Company | 6 | 6 | 12 19 | Mar 28, 2024 |
| Hastings Mutual Insurance Company | 6 | 5 | 12 19 | Mar 13, 2025 |
| Siriuspoint GroupSiriusPoint America Insurance Company | 6 | 2 | 12 19 | Jun 15, 2026 |
| Axis Capital GroupAXIS Insurance Company | 4 | 1 | 04 13 | Apr 11, 2025 |
| CNA Insurance Group6 group companies filed it, led by American Casualty Company of Reading, Pennsylvania and Continental Casualty Company | 3 | 3 | 04 1312 19 | Oct 6, 2026 |
How the largest insurers handle CG 20 31
Groups among the largest commercial general liability insurers that filed CG 20 31 or their own version in the past five years.
- Berkshire Hathaway GroupUses CG 20 31 in 1 filing
- Fairfax Financial GroupUses CG 20 31 in 1 filing
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States
Number of filings that include CG 20 31 in each state, Oct 2021 to Oct 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- CG 20 07Additional Insured - Engineers, Architects or Surveyors113 filings
- CG 20 23Additional Insured - Executors, Administrators, Trustees or Beneficiaries113 filings
- CG 20 27Additional Insured - Co-Owner of Insured Premises113 filings
- CG 20 05Additional Insured - Controlling Interest112 filings
- CG 20 12Additional Insured - State or Governmental Agency or Subdivision or Political Subdivision - Permits or Authorizations112 filings
- CG 20 13Additional Insured - State or Governmental Agency or Subdivision or Political Subdivision - Permits or Authorizations Relating to Premises112 filings
- CG 20 15Additional Insured - Vendors112 filings
- CG 20 18Additional Insured - Mortgagee, Assignee or Receiver112 filings
- CG 20 24Additional Insured - Owners or Other Interests From Whom Land Has Been Leased112 filings
- CG 20 32Additional Insured - Engineers, Architects or Surveyors Not Engaged by the Named Insured112 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Oct 22, 2026 | State National Insurance Company, Inc. | CO | 12 19 | STNA-135128706 |
| Oct 6, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CA | 12 1904 13 | CNAB-135091690 |
| Jun 24, 2026 | Southern Trust Insurance Company | GA | 12 19 | STTR-134864949 |
| Jun 23, 2026 | Addison Insurance Companyand 1 more | CO | 12 19 | UNFG-134979892 |
| Jun 18, 2026 | Sompo America Insurance Company | CO | 12 19 | SMPJ-134985965 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | NM | 12 1904 13 | BEAC-134983795 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 12 19 | MRTN-134978899 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 12 19 | MRTN-134978902 |
| Mar 20, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CO | 12 1904 13 | CNAB-134872676 |
| Feb 24, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | SC | 12 1904 13 | CNAB-134851008 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 12 19 | SFCC-134814522 |
| Feb 6, 2026 | Crum and Forster Indemnity Company | CA | 12 19 | CRUM-134831877 |
Most filed ISO CG forms
- CG 40 32 Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
- CG 21 06 Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information
- CG 20 10 Additional Insured - Owners, Lessees or Contractors - Scheduled Person or Organization Endorsement
- CG DS 01 Commercial General Liability Declarations
- CG 20 26 Additional Insured - Designated Person or Organization Endorsement
- CG 00 01 Commercial General Liability Coverage Form
- CG 20 37 Additional Insured - Owners, Lessees or Contractors - Completed Operations Endorsement
- CG 40 28 Broad Abuse or Molestation Exclusion
- CG 20 28 Additional Insured - Lessor of Leased Equipment
- CG 20 11 Additional Insured - Managers or Lessors of Premises
- CG 21 47 Employment-Related Practices Exclusion
- CG 04 35 Employee Benefits Liability Coverage
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