OSHA has jurisdiction for industry. If you're a small contractor (<10), or a family owned enterprise you're off their books.
Not sure what you mean by 'off their books'
You may not be on the list for a random visit but if you have if you have one employee that employee is covered by OSHA.
That one employee is lawfully entitled to the same level of protection as an employee in a large company.
Here it is straight from OSHA.
What are your responsibilities as an employer?
Under the provisions of the Occupational Safety and Health Act of 1970 ( OSH Act), as the employer, you must provide a workplace free from recognized hazards that are causing, or are likely to cause, death or serious physical harm to your employees regardless of the size of your business. You must comply with OSHA standards and regulations under the OSH Act. You must also be familiar with those OSHA standards and regulations that apply to your workplace and make copies of them available to employees upon request.
You can see more if you click the link Greg provided above.
If an accident happens you can bet they will stop by.
[This message has been edited by iwire (edited 08-01-2006).]