---
title: "TJ Monahan — Design-Build Firms | Houzz"
canonical_html_url: https://www.houzz.com/professionals/design-build-firms/tj-monahan-pfvwus-pf~436254330
markdown_url: https://www.houzz.com/md/professionals/pf~436254330.md
entity_type: LocalBusiness
business_name: "TJ Monahan"
category: ["Design-Build Firms"]
image: https://st.hzcdn.com/fimgs/22d3720904733e67_9478-w400-h400-b0-p0--.jpg
address: "Bethesda, Maryland 20816, United States"
phone: "(571) 422-2286"
website: http://www.DesignedHappy.com
rating: 5
review_count: 3
best_of_houzz_awards: 1
followers: 24
last_updated: 2026-09-23
---

# TJ Monahan

Original Houzz profile: [TJ Monahan](https://www.houzz.com/professionals/design-build-firms/tj-monahan-pfvwus-pf~436254330)

## Professional summary

- **Primary category:** Design-Build Firms
- **Location:** Bethesda, MD
- **Serves:** Silver Spring, Rockville, Bethesda, North Bethesda, Potomac, College Park, North Potomac, Takoma Park, Kensington, Alexandria, Arlington, DC (Washington), Fairfax, Falls Church, Great Falls, Mclean, Tysons Corner, Washington
- **Houzz rating:** 5.0 out of 5 (3 reviews)
- **Best of Houzz:** 1 award (2017), for Service.

## About

### Houzz Badges

- 100 Ideabook Saves

We're here to help you live happier at home & have fun getting there.

:Designed Happy is a high-end full service residential architecture, interior design, & décor firm licensed in DC, MD, VA, and DE.  We're experts in new construction & remodeling, in primary homes, vacation homes & condos.  Check out the website to learn more.  :D

### Services Provided

- Home Remodeling
- Custom Homes
- Kitchen Remodeling
- Home Additions
- Bathroom Remodeling
- Kitchen Design
- Home Extensions
- Bathroom Design
- Architectural Design
- Building Design
- House Plans
- Pool House Design & Construction
- Home Restoration
- Floor Plans
- Basement Design
- Universal Design
- Custom Home Bars
- Green Building
- Sustainable Design
- Sunroom Design & Construction
- Space Planning
- Deck Design
- Mudroom Design
- Home Theater Design

### Areas Served

- Silver Spring
- Rockville
- Bethesda
- North Bethesda
- Potomac
- College Park
- North Potomac
- Takoma Park
- Kensington
- Alexandria
- Arlington
- DC (Washington)
- Fairfax
- Falls Church
- Great Falls
- Mclean
- Tysons Corner
- Washington

## Business Details

| Field | Value |
| --- | --- |
| Business Name | TJ Monahan |
| Address | Bethesda, Maryland 20816, United States |
| Phone | (571) 422-2286 |
| Website | http://www.DesignedHappy.com |
| Followers on Houzz | 24 |

**Social profiles:**
- Blog — www.DesignedHappy.com

## Contact

- **Houzz profile:** [TJ Monahan](https://www.houzz.com/professionals/design-build-firms/tj-monahan-pfvwus-pf~436254330)
- **Website:** http://www.DesignedHappy.com
- **Phone:** (571) 422-2286

## Credentials

**Certifications & Awards**
- MArch, Leed AP, Real Estate License, 40 under 40

- **Best of Houzz:** 1 award (2017), for Service.

## Reviews

**Overall rating: 5.0 out of 5 — 3 reviews**

### All 3 reviews

**★★★★★ — Cami Wilcox, Feb. 2017**

> We invited TJ to design a usable space from an old basement bathroom. He blew our minds with his design. He offered three options and provided a cost estimate for each. He quickly addressed our concerns and desires at the design steps and made sure we were happy every step after that.
>
> We love our bathroom and would do it all over again in a heartbeat.

**Comment from TJ Monahan:**

> Thanks, Cami!!  I had so much fun working with you all \[and would also do it again in a heartbeat : ) \].

**★★★★★ — mathis\_jeremy, May 2016**

> We purchased a home in Bethesda last year that is in need of a complete overhaul in the kitchen and bathrooms.  TJ came in and gave us some great advice and guidance on what we could and couldn't do with the house.  He listened to our needs and wants and came up with three options for us.  Along the way, he was attentive and very professional.  In the end, we decided not to move forward until we build more equity in the house, but dealing with TJ and CASE was an excellent experience.  We highly recommend them.

**Comment from TJ Monahan:**

> Thanks, Jeremy!  I really loved meeting you both.  Hopefully we'll work together again some time.

**★★★★★ — 大熊一滋, May 2016**

> While still living in Tokyo, I tried to renovate my condo I purchased last autumn in Washington, DC.  The condo was about 40 years old from the previous renovation and I needed to renovate the whole kitchen area and the part of the bathroom.  TJ offered to use a teleconference system that allowed us to communicate face to face on video while looking at the drawings on a computer screen. This system was very helpful because I had to finalize the detail of the drawings while I was in Tokyo.  I met TJ face to face only twice:  To determine the detail of the renovation for the first time, and to check the completion at the second time.  He also negotiated with the manager of the condo to get an approval for the renovation. One of my major goals of this renovation is to set up the exhaust ducts from the kitchen to the outside.  I am so happy to find out that Case was able to set up exhaust ducts from the kitchen to the outside of the condo by restoring old unused exhaust ducts.  I highly recommend TJ’s professionalism and Case’s performance to those who are looking for an efficient contractor to renovate your kitchen and bathroom. Wherever you are living, TJ would somehow help you to make all the renovation processes very efficient.  Thank you TJ and Case for your performance.

**Comment from TJ Monahan:**

> Thanks so much, Kaz.  I really enjoyed working with you.  Enjoy the new spaces (and cooking with a proper exhaust hood)!!

## Selected projects

- [Bethesda, MD - Bathroom Remodels](https://www.houzz.com/hznb/projects/bethesda-md-bathroom-remodels-pj-vj~2660778)
  - Location: Bethesda, MD
  - Photos: 12
- [Modern Farmhouse](https://www.houzz.com/hznb/projects/modern-farmhouse-pj-vj~2277768)
  - Location: Not specified
  - Photos: 35
  - Description: This is custom home I designed for my family on an undeveloped lot in Kensington, MD. It is a corner lot with a 24ft grade change...
- [Vienna, VA - Bath Remodel](https://www.houzz.com/hznb/projects/vienna-va-bath-remodel-pj-vj~1707557)
  - Location: Vienna, VA
  - Photos: 7
- [Chevy Chase, MD - Kitchen and Bath Remodel](https://www.houzz.com/hznb/projects/chevy-chase-md-kitchen-and-bath-remodel-pj-vj~1725314)
  - Location: Chevy Chase, MD
  - Photos: 14
- [Chevy Chase, MD - Bathroom Remodel](https://www.houzz.com/hznb/projects/chevy-chase-md-bathroom-remodel-pj-vj~2129653)
  - Location: Chevy Chase, MD
  - Photos: 10
- [Kensington, MD - Old Farmhouse, New Life](https://www.houzz.com/hznb/projects/kensington-md-old-farmhouse-new-life-pj-vj~1744062)
  - Location: Not specified
  - Photos: 15
  - Description: Whole house remodel of traditional Kensington Farmhouse. Visit www.DesignedHappy.com to learn more about the project.
- [Modern Bathroom](https://www.houzz.com/hznb/projects/modern-bathroom-pj-vj~808186)
  - Location: Not specified
  - Photos: 11
  - Description: I was the designer for this bathroom renovation by Case Design/Remodeling and ibby
- ["Tree House" over the Potomac](https://www.houzz.com/hznb/projects/tree-house-over-the-potomac-pj-vj~800118)
  - Location: Not specified
  - Photos: 13
  - Description: I was the designer for this addition and interior renovation by Case Design/Remodeling
- [Modern Kitchen](https://www.houzz.com/hznb/projects/modern-kitchen-pj-vj~800232)
  - Location: Not specified
  - Photos: 13
  - Description: I was the designer for this kitchen and interior renovation by Case Design/Remodeling

[See all 9 projects](https://www.houzz.com/professionals/design-build-firms/tj-monahan-pfvwus-pf~436254330)

## Ideabooks

- [McDaniel](https://www.houzz.com/ideabooks/179361776/list/mcdaniel) — 32 ideas
- [Modern Victorian](https://www.houzz.com/ideabooks/111910899/list/modern-victorian) — 10 ideas
- [English Cottage Inspiration](https://www.houzz.com/ideabooks/109791721/list/english-cottage-inspiration) — 5 ideas
- [modern cape](https://www.houzz.com/ideabooks/47907445/list/modern-cape) — 7 ideas
- [Stanley/Turner](https://www.houzz.com/ideabooks/47241911/list/stanley-turner) — 7 ideas
- [Herman](https://www.houzz.com/ideabooks/42335774/list/herman) — 5 ideas
- [Double Showers](https://www.houzz.com/ideabooks/40034100/list/double-showers) — 10 ideas
- [Modern Kitchens](https://www.houzz.com/ideabooks/34743264/list/modern-kitchens) — 19 ideas
- [Wall hung vanities](https://www.houzz.com/ideabooks/35171066/list/wall-hung-vanities) — 10 ideas
- [Modern Exteriors](https://www.houzz.com/ideabooks/34960736/list/modern-exteriors) — 14 ideas
- [Modern Bathrooms](https://www.houzz.com/ideabooks/34743161/list/modern-bathrooms) — 1 idea

[See all 11 ideabooks](https://www.houzz.com/ideabooks/users/tj-monahan)

---

*Source: Houzz professional profile. Reflects the profile as of 2026-09-23.*