Monday to Friday, 7:00 am to 6:00 pm · Olney, MD MHIC #113016 · (240) 855-9789
Completed home addition exterior, a GHI Improvements project
GHI Improvements › Home additions in Olney, MD
★★★★★ 4.8 on Google · 19 reviews

Home additions in Olney, MD, built to look like they were always part of the house.

You love the street, the yard and the neighbors, and you have outgrown the house. Moving means a bigger mortgage and a new commute. An addition means one more bedroom, a first-floor suite for a parent or a family room off the kitchen, with a written price before the first footing is poured.

Bedrooms, in-law suites, family rooms and bump-outsMatched roofline, siding and trimMontgomery County permit and inspections handledYour written estimate is free
Get your written estimateCall (240) 855-9789
Google reviews

What homeowners say about their GHI additions

Every review below is a public Google review of GHI Improvements.

★★★★★

“I had an extra bedroom added to my house. It looked amazing when they were done. Looked like the bedroom always was a part of the house. They showed up on time every day that they came.”

Lenee Tucker · May 2024
★★★★★

“We worked with Elio Portillo and GHI Improvements on a full renovation of our old Victorian home, including a bump-out addition, brand new kitchen, 3.5 bathrooms, new master suite, refinished floors, finished basement…”

Melissa Joy · Oct 2025
★★★★★

“We have had Elio lead several projects at our residence and he has always been reliable, fair, and on schedule. We would highly recommend using GHI!”

Jesse Kaiss · Jun 2024

Read all 19 reviews on Google →

4.8★Google rating
2018LLC registered in Maryland
MHICLicensed home improvement
OlneyWhere your crew starts the day
What we build

Types of additions we build

Every addition starts with the question of where the space should go. These are the shapes most Olney homes end up with:

Bedroom additions

A fourth bedroom over the garage or off the back, with closets and a window that meets egress code.

First-floor master or in-law suite

Bedroom, full bathroom with a walk-in shower, and a door to the main house, so a parent can live with you and keep some privacy.

Family room and kitchen bump-outs

Push the back wall out six to twelve feet to make the kitchen and family room one open space.

Second-story additions

Adding a full floor to a rambler or Cape Cod, including the structural work to carry it.

Sunrooms and screened porches

Three-season rooms on a proper foundation that can be heated and finished later.

Local proof

Additions we have built

Two Google reviews on this page describe GHI additions: a bedroom added to a house in a way that looked like it was always there, and a full Victorian renovation in Montgomery County that included a bump-out addition, a new kitchen and a master suite. The photo at the top is a finished GHI addition exterior. Our Google profile holds more than 200 job-site photos.

White kitchen with island, a GHI project
Finished basement with bar, a GHI project
New tiled walk-in shower, a GHI project
Stone patio installation, a GHI project
Pricing

What an addition costs

Price depends on size, foundation type, whether a bathroom is included and how much of the existing house changes. After the walkthrough you receive a written scope and price with a milestone payment schedule, and we hold to it unless you ask for a change, which is priced in writing first. Additions are the largest projects we build and the best fit for our crew.

How it works

Four steps, no surprises

1

Walkthrough

We visit, measure and listen to what you want from the space.

2

Written estimate

A clear scope and price in writing. No vague allowances.

3

Permits & build

GHI files with Montgomery County Department of Permitting Services and schedules the inspections. One crew, one point of contact.

4

Final walkthrough

We finish the punch list, clean up and hand over a space that passes inspection.

Free estimate

Tell us about your Olney project. You get a written estimate.

Three quick questions, then a call back to set your walkthrough, usually the same business day.

  • Best fit: remodels and additions over roughly $10,000
  • Your estimate is in writing, so you can compare it
  • Permits and inspections handled by GHI
Step 1 of 3About 30 seconds

What are you planning?

When do you want to start?

Where should we call you?

By sending you agree to be contacted by GHI Improvements about your project. No spam, no lists.

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Thanks. Expect a call back shortly.

In a hurry? (240) 855-9789

Good to know

Questions from Olney homeowners

How long does an addition take?

A single-room addition is usually eight to fourteen weeks on site from footing to final inspection; a second story or a suite with a bathroom runs longer. Your estimate includes the schedule.

Do I need an architect?

For most single-room additions we work from a drawn plan that the county will accept; for second stories and complex structures we bring in a structural engineer or architect and include that in the scope.

Will the permit be a problem?

Montgomery County requires a building permit, a zoning check for setbacks and lot coverage, and inspections at footing, framing, rough-in, insulation and final. We handle all of it.

Can we live in the house during construction?

Almost always. We seal the opening between the house and the addition until the new space is weather-tight and the final connection is made.

Will the addition match the house?

Yes. Roof pitch, siding, trim, window style and brick or stone are matched so the house reads as one. That is what the homeowner reviews on this page describe.

Do you do additions outside Olney?

Yes, across Montgomery County and into Howard, Prince George's, Anne Arundel and Harford counties. See our service-area pages for each.

📞 Call (240) 855-9789