---
title: "Home additions in Baltimore County, MD | TBG"
description: "Get matched with a licensed addition contractor in Towson, Catonsville, Timonium, Perry Hall and across Baltimore County, Maryland. Free to homeowners."
url: https://thebrettgroup.com/remodeling/additions/baltimore-county/
last_updated: 2026-10-14
---

[TBG](https://thebrettgroup.com/) / [Home Remodeling](https://thebrettgroup.com/remodeling/) / Additions / Baltimore County

Additions

# Home additions in Baltimore County

Get matched with a licensed addition contractor serving Towson, Catonsville, Timonium, Perry Hall and the rest of the county, at no cost to you.

## What our partner contractors handle

Room additions and bump-outs

Second-story additions

In-law and accessory suites

Design and engineering coordination

Foundations, framing and roofing

Permits through Baltimore County

## Permits for additions in Baltimore County

Additions need a building permit from Baltimore County's Department of Permits, Approvals and Inspections (PAI). Sealed plans from a Maryland-licensed design professional are required for additions of 600 square feet or more, new bedrooms, second-floor additions and structural work, along with a 2021 energy code form.

Landmark and historic-district properties need a Certificate of Appropriateness from the Landmarks Preservation Commission, and floodplain lots need two elevation certificates from a licensed surveyor.

More in our [Baltimore County permit guide](https://thebrettgroup.com/guides/baltimore-county-building-permits/). Towns we cover: [Towson](https://thebrettgroup.com/remodeling/towson/) · [Catonsville](https://thebrettgroup.com/remodeling/catonsville/) · [Arbutus](https://thebrettgroup.com/remodeling/arbutus/) · [Timonium and Lutherville](https://thebrettgroup.com/remodeling/timonium-lutherville/) · [Perry Hall](https://thebrettgroup.com/remodeling/perry-hall/) · [Parkville](https://thebrettgroup.com/remodeling/parkville/).

## What to expect

### Match

We review your request and connect you with the partner who fits your scope and location.

### Site visit and quote

The contractor measures, talks through options and gives you a written proposal.

### Contract and build

You sign directly with the contractor. Maryland law caps the deposit at one-third of the contract price at signing.

## Common questions

### Who actually does the work?

An independently owned contractor licensed by the Maryland Home Improvement Commission. TBG makes the introduction; it does not perform or sell the work.

### Does it cost me anything?

No. Matching is free to homeowners. TBG is paid by its partner contractors.

### How do I check a contractor's license?

Every partner shows their MHIC number, which you can look up on the Maryland Department of Labor site. Contractors must also show it on their contracts, trucks and ads.

### What happens after I submit?

We review your request and connect you with one partner who covers your area and your type of project. They contact you to schedule a site visit and a written quote.

[See projects by size and scope →](https://thebrettgroup.com/remodeling/projects/)

## Plan with our local guides

The Baltimore County rules and choices that most often change additions projects.

[- **Baltimore County permits**: Deck, fence, shed and basement thresholds, and who can pull trade permits.](https://thebrettgroup.com/guides/baltimore-county-building-permits/) · [- **Hiring a contractor**: Ten checks before you sign, from the MHIC license to the deposit cap.](https://thebrettgroup.com/guides/hiring-a-contractor-maryland/)

## Other projects

[Kitchen remodels](https://thebrettgroup.com/remodeling/kitchen/baltimore-county/) · [Bathroom remodels](https://thebrettgroup.com/remodeling/bathroom/baltimore-county/) · [Basement finishing](https://thebrettgroup.com/remodeling/basement/baltimore-county/) · [New custom homes](https://thebrettgroup.com/remodeling/custom-homes/baltimore-county/) · [Decks & exteriors](https://thebrettgroup.com/remodeling/decks-exteriors/baltimore-county/)

Additions in other counties: [Anne Arundel County](https://thebrettgroup.com/remodeling/additions/anne-arundel/) · [Howard County](https://thebrettgroup.com/remodeling/additions/howard-county/)