"Cold Steel" by Terry Johnston // CC BY 2.0

G

ALERT

Gerard W Diem Sr

this is my business

ALERT

Home

/

Search

/

Best Plumbers in Bel Air

Updated: Sep 03, 2025

Gerard W Diem Sr Plumber

Gerard W Diem Sr at 1005 LEESWOOD ROAD, Bel Air, MD 21014, held a Plumber license (#3004) with the Maryland contractors license board with an expiration date of 07-30-2019. We last verified the license was expired on 09-02-2025.

Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 58,058 Maryland contractors.

If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our bidding system to be easily matched to qualified, licensed professionals in your area.

Recent Buildzoom Projects

Inactive License

License #	3004
Status	Inactive
State	Maryland
Type	Plumbers

According to the Maryland Department of Labor, Licensing & Regulation, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.

Check this license's status for Gerard W Diem Sr at the Maryland Department of Labor, Licensing & Regulation.

This is a sample of licensing data; click here to access a complete history.

ALERT*

BuildZoom Score

How the BuildZoom Score works
*No active license on file. If you are Gerard W Diem Sr, click “This is My Business” to update your information.

Follow this contractor

Before you Hire

Here are some rules, regulations, and laws governing general contractors in Maryland:

Does Gerard W Diem Sr carry a valid contracting license?

Maryland laws protect consumers by requiring home improvement contractors to hold a current license issued by the Maryland Home Improvement Commission.

Gerard W Diem Sr currently holds license 3004 (Plumbers), which was Inactive when we last checked.

How important is contractor licensing in Maryland?

The Maryland Home Improvement Commission maintains high standards for home improvement contractor licensing. Applicants must provide proof of at least two years of experience or education in their given field and pass a board exam prior to receiving their license.

Your liability risk when hiring Gerard W Diem Sr

Licensed contractors in Maryland are required to show proof of $50,000 liability insurance in order to obtain their license.

Financial recourse when hiring Gerard W Diem Sr

If you hire a licensed contractor in Maryland, you are protected by the State's Home Improvement Guaranty Fund. This fund is administered by the Home Improvement Commission to compensate homeowners who suffer economic damages at the hands of a licensed home improvement contractor. No coverage is provided to the homeowner if the contractor is not properly licensed.

What else should I know before hiring Gerard W Diem Sr

Licensed contractors in Maryland must provide proof of financial solvency based on the scope and size of their business in relation to total assets, liabilities, credit rating, and net worth.

How is the BuildZoom score calculated?

The BuildZoom score is based on a number of factors including the contractor's license status, insurance status, verified work history, standing with local consumer interest groups, verified reviews from other BuildZoom users and self-reported feedback from the contractor.

Why you should hire through BuildZoom

When it comes to major construction work or even minor alterations to your home, hiring the wrong contractor could result in incomplete or defective work. You may even find yourself dealing with huge liability claims. BuildZoom does the homework for you and helps you hire the right contractor.

You should get several bids before hiring a contractor

The Maryland Home Improvement Commission recommends getting at least three written bids before hiring a contractor. Do not automatically accept the lowest bid - an abnormally low bid may indicate the contractor made a mistake and is not including the same work quoted by their competitors. We've made the bid collection process extremely simple (and free). Just click here to get started.

The best way to use BuildZoom is to let us recommend contractors for your remodeling projects.

Homeowners who hire through BuildZoom's free bidding system report high rates of satisfaction, and homeowners who research contractors online are twice as likely to be happy at the end of their project.

If you hire a contractor through BuildZoom, that contractor is accountable to us. We can enforce standards of behavior, mediate disputes, and guarantee satisfaction.

Read more about why hiring through BuildZoom is so effective.

BuildZoom’s database now contains every licensed contractor across the U.S. - over 2.5 million of them... Categorized contractor profiles are enriched using government data from state licensing boards, Better Business Bureau ratings, and more… BuildZoom jumped into the fray by announcing that it raised $10.6 million in a round led by Formation 8. ...the Y combinator-backed startup said it will be focused on remodeling projects, where the median budget is around $19,000… A new index compiled by BuildZoom — which identifies contractors for projects — found that renovations are running 2.8 percent above their 2005 level…

Browse remodeling photos

If you are looking for remodeling ideas, you can browse hundreds of beautiful photos of work performed by our general contractors.

Browse building permits

You can use our building permit search to see the contractors who are active in your neighborhood and the projects currently taking place.

Get a cost estimate

Use our remodeling calculator to get a ballpark estimate for your project. If you're ready to hire, use our bidding system to get actual quotes from local contractors.