G&W Engineering

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G&W Engineering Single-source engineering partner since 1992. With all disciplines located in our St.

We coordinate MEPFP, Structural, Civil, Commissioning, Enclosure, and Assessment services under one roof to create healthy environments where people live, work, and play. G&W Engineering Corporation provides facility consulting engineering services for a wide spectrum of commercial, industrial and institutional facilities. We specialize in MEP facility systems, building commissioning, retro-commissioning, sustainable design (LEED) services and facility energy assessments. Founded in 1992 by principals Kevin Griesemer and Mike Williams, the firm strives for Engineering Excellence and Gold Standard results. We at G&W hold ourselves to high standards of excellence and our work, backed by deep industry experience and dynamic thinking, achieves sustainable, high quality results. Our principals have a hands-on policy and are consistently involved in every aspect of contract documentation and engineering decisions. Louis headquarters and our national exposure, we ensure high quality and efficient project management. Our approach is simple but hugely effective - capitalize on our vast, collective industry experience to produce superior construction documents that best serves our clients and achieves the maximum return on their facility investment.

Four project teams. Two expansions. One plant.Since 2023, we’ve helped Prysmian’s Du Quoin plant grow, one project at a ...
10/09/2026

Four project teams. Two expansions. One plant.

Since 2023, we’ve helped Prysmian’s Du Quoin plant grow, one project at a time. Swipe through for the story.

It was great seeing everyone at the BJC HealthCare Small Business Enterprise Expo yesterday!The thing Alyssa Polete and ...
10/09/2026

It was great seeing everyone at the BJC HealthCare Small Business Enterprise Expo yesterday!

The thing Alyssa Polete and Brett Rossomanno heard most at our table: “I didn’t realize you did all that.” We’ll take it.

Thank you to BJC for the opportunity!

We recently wrapped up our second year supporting KidSmart through our back-to-school supply drive.If you don't know Kid...
10/08/2026

We recently wrapped up our second year supporting KidSmart through our back-to-school supply drive.

If you don't know KidSmart -- Tools For Learning, they run a free supply store for St. Louis area teachers in under-resourced schools. Teachers shop, kids get what they need, nobody pays. They equip tens of thousands of local students every year, and most of it comes from drives like this one.

We realized last year that KidSmart still uses a picture of our office coordinator's daughter from 13 years ago! She's graduated now, and she helped deliver the donations.

Thanks to everyone at G&W who added to the pile.

Chess or Golf, we'll play both. ⛳♟️Our very own Brett Rossomanno was a part of the Chess Club & Scholastic Center of Sai...
10/06/2026

Chess or Golf, we'll play both. ⛳♟️

Our very own Brett Rossomanno was a part of the Chess Club & Scholastic Center of Saint Louis's 16th Annual Charity Golf Tournament, supporting the club's chess education and outreach programs. We are proud to be the MEPFP and Civil Engineering team who helped create such a wonderful and unique recreational center for chess players in the St. Louis area.

Thank you to Dan Rettenmaier at Daikin TMI for inviting us!

Our Enterprise Way project in Bridgeton was recently mentioned in First Alert 4's story on how MSD Project Clear is addr...
10/05/2026

Our Enterprise Way project in Bridgeton was recently mentioned in First Alert 4's story on how MSD Project Clear is addressing rainfall events and stormwater control! Our civil team replaced an open detention basin with an underground StormTech system by Advanced Drainage Systems beneath the expanded parking lot. Improved stormwater protection, plus usable space gained back.

See the project: https://gandwengineering.com/enterprise-loading-dock/

First Alert 4 News story in the comments.⬇️🌧️

Site civil stormwater design for a 2.11-acre loading dock and parking redevelopment in Bridgeton, MO, with underground detention permitted through MSD.

The average engineer stays at a job about 5 years. Bryan and Dan have stayed 53. 🎉Please help us congratulate Bryan McDa...
10/01/2026

The average engineer stays at a job about 5 years. Bryan and Dan have stayed 53. 🎉

Please help us congratulate Bryan McDaniel (28 years) and Dan Walsh, P.E. (25 years), two of the longest-tenured members of the G&W family. Swipe through to see how far they've come since 1998 and 2001!

Thank you both for everything you bring to our team and our clients. Drop your congratulations in the comments! 👇

09/30/2026

Some buildings are too good to lose.
This one opened in 1903 as one of Wisconsin's first Carnegie libraries and today serves the U.S. District Court.

G&W handled the MEPFP engineering for its second-floor renovation, fitting new HVAC, plumbing, lighting, and power behind original plaster and stained glass. Work like this keeps landmarks standing and useful for the next generation.
See more on our website → https://gandwengineering.com/jefferson-courts-building/

Happy National Coffee Day!A few of us took a field trip to the Edwardsville Dutch Bros this morning. It's one of five we...
09/29/2026

Happy National Coffee Day!
A few of us took a field trip to the Edwardsville Dutch Bros this morning. It's one of five we've worked on, and we figured we should make sure it still works. It does. ☕

When Zelis needed a second production facility, they didn't shop around. They came back to us.We engineered their first ...
09/24/2026

When Zelis needed a second production facility, they didn't shop around. They came back to us.
We engineered their first plant in Fenton, MO. When they opened a second in Phoenix, they brought their own architect and still trusted G&W with the engineering, because we were already licensed in Arizona and they already knew the result.
Two buildings, two states, all systems handled. Clients tend to find us, then stick with us. Here's one reason why.
www.gandwengineering.com/markets

Missouri S&T, come and see us at the Career Fair today!If you're a student looking for a summer internship opportunity w...
09/22/2026

Missouri S&T, come and see us at the Career Fair today!

If you're a student looking for a summer internship opportunity with a great team and real-world experience, check out our booth and say hello to our team!

Address

138 Weldon Pkwy
Maryland Heights, MO
63043

Opening Hours

Monday 7:30am - 5pm
Tuesday 7:30am - 5pm
Wednesday 7:30am - 5pm
Thursday 7:30am - 5pm
Friday 7:30am - 5pm

Telephone

(314) 469-3737

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