Advanced panelized construction · St. Louis, MOA better way to build for tomorrow
Factory-built wall panels and floor cassettes for homes, rowhomes and multifamily up to six stories. Up to a 50% quicker construction schedule, a fixed factory price and delivery anywhere in America.
- Stick-built, not modular
- Fixed factory price
- Built to your drawings
MBS by the numbers
Lower project cost
Up to30%
Fixed factory price at contract
Quicker construction schedule
Up to50%
Factory and site work run in parallel
Less waste
90%
Offcuts stay in the plant
Standard delivery range
1,000mi
We ship anywhere in America by project
Building height
6stories
Wood-framed, 1 to 6 stories
CNC plant
40,000ft²
921 N 20th Street, St. Louis
- Selected for the City of St. Louis Infill RFP
- 2023 Arch Grants recipient
- Member, Modular Building Institute
- Ranken Technical College workforce partner
In the news:The Wall Street Journal · St. Louis Post-Dispatch · St. Louis Business Journal · First Alert 4
Featured project · North St. Louis
Greater Ville Infill Housing
The City of St. Louis selected MBS through its Infill Housing RFP to build 15 single-family and row homes on city-owned lots in The Ville.
- Contract
- $3.25M
- Homes
- 15
- Status
- In production
The program supports North St. Louis neighbors and tornado recovery. The homes are The Malone and The Malone Rowhomes, our three-bedroom infill designs. Wall panels are in production at our North St. Louis plant, and the first home's panels went up on site in October 2026.
What we build
One wood-framed system, from a backyard ADU to six stories
Any stick-built project from one to six stories. Bring your drawings or start from ours.
Single-family homes
From 1,200 ft²
Townhomes and rowhomes
Typically 1,200 to 2,000 ft² per unit
ADUs and carriage houses
Backyard and alley living
Multifamily and mixed-use
Wood-framed, 1 to 6 stories
Affordable housing
Scattered-site and neighborhood infill
Relief and temporary housing
Relief cottages and shelter concepts
Renderings are MBS concept designs, shown for illustration.
How it works
From drawings to weather-tight in five steps
Factory production runs while your foundation goes in. That is where the schedule comes from.
01
Design
Your drawings or ours
Send permit-ready plans, or let our in-house architectural designer start from a survey and lot dimensions. Every project is modeled in BIM.
02
Estimate
Fixed price, valid 30 days
We price your plans and return a fixed factory price, with freight priced in.
03
Manufacture
While your foundation goes in
After permit approval, panels are CNC-cut, framed, insulated and closed with windows, doors, cladding and MEP rough-in to the agreed scope.
04
Deliver
Standard trucks
Panels ship vertically or flat-packed on standard flatbed and step-deck trucks. No wide loads, no escorts.
05
Install
Weather-tight in days, not weeks
Your GC leads panel setting on your foundation, and MBS installation is available by agreement. Interior trades start in a dry, enclosed building.
Why the schedule is up to 50% quicker
Schematic. Actual schedules depend on project scope, approvals, site readiness, materials and logistics. Your schedule is confirmed at contract.
Factory · panel manufacturing
Site · foundation, then set and close
Conventional build · one trade after another
MBS panelized build · up to 50% quicker
Three ways to work with MBS
Pick the scope. We hold the price.
Just the factory framing. CNC-cut subcomponents and open framed wall panels, built to your drawings. Your crew sheathes, closes and finishes on site.
- Subcomponents: door legs, headers, stud packs, channels, Els
- Open framed wall panels with coordinated openings
- Buy only the pieces your crew needs
CNC-cut, framed and sheathed wall panels, roof panels and floor cassettes. Your team insulates, closes and finishes on site.
- CNC-cut framing
- Structural sheathing
- Wall panels, roof panels, floor cassettes
Sheathing, WRB, insulation, air barrier, windows, doors, cladding and MEP rough-in are factory-installed to the agreed scope. Your GC leads panel setting and coordinates the follow-on trades.
- Everything in sheathed
- Mineral wool insulation, R-23 walls
- Windows, doors and cladding
- MEP rough-in
- Rothoblaas air and vapor control
Your GC leads panel setting and completion, and MBS installation is available by agreement. The owner or GC provides foundations, site work, utilities and interior finishes unless the agreement includes them. Approved drawings and the agreed scope govern the final package.
The MBS Standard Wall
Seven layers. R-23.
Closed on the line, inspected before it ships. An MBS home achieved HERS 42.
- 1Exterior cladding
- 2Weather-resistive barrier
- 3Structural sheathing
- 4Exterior framing
- 5Cavity insulation
- 6Air and vapor control
- 7Interior gypsum
Exterior (1) to interior (7). Illustration, not to scale; approved drawings govern.
Built to your specifications
The MBS Standard is our baseline. We also build to client specifications, based on your project's needs, the quality of materials you want and your build requirements.
How custom specs workDesign catalog
Start from a plan that is ready to price
Concept designs for infill lots, rowhome blocks and backyard ADUs. Every one can be adapted to your site.
Single-familyMBS-SFH-1864
The Mason
Brick at the street. Room for a family inside.
- Beds
- 3
- Baths
- 2.5
- Stories
- 2
- Sq ft
- 1,864
RowhomesMBS-ROW-2406
The Brickline
Four brick townhomes. Three floors each.
- Beds
- 3
- Baths
- 2.5
- Homes
- 4
- Sq ft
- 2,406
ADUMBS-ADU-600
The Perch
A one-bedroom apartment over an alley garage.
- Beds
- 1
- Baths
- 1
- Stories
- 2
- Sq ft
- 600
Relief housingMBS-REL-560
The Haven
Room to live. Designed to belong.
- Beds
- 1
- Baths
- 1
- Homes
- 12
- Sq ft
- 560
Single-familyMBS-SFH-5415
The Slope
A hillside home. Two full levels of living.
- Beds
- 5
- Baths
- 4
- Stories
- 2
- Sq ft
- 5,415
MultifamilyMBS-MF-3726-2U
The Duet
Two homes. One simple building.
- Units
- 2
- Beds
- 3
- Sq ft / unit
- 1,863
- Bldg sq ft
- 3,726
Active projects
On the books in 2026
$12M+ in projects this year, led by the City of St. Louis Infill program.
| ID | Project | Segment | Location | Scope | Status |
|---|---|---|---|---|---|
| MBS-P01 | Greater Ville Infill HousingCity of St. Louis (SLDC / LCRA) · The Malone | Affordable housing | The Ville, St. Louis, MO | 15 single-family and row homes$3.25M | In production |
| MBS-P02 | Kansas City Row ResidencesPrivate developer | Rowhomes | Raymore, MO (Kansas City metro) | 16 homes in two eight-home rows | In design |
| MBS-P03 | Infill Lot StudyPrivate developer | Rowhomes and multifamily | St. Louis, MO | 8 rowhomes, 9 flats or 15 to 19 apartments | In design |
| MBS-P04 | Stacked Three-FlatPrivate developer | Multifamily | St. Louis, MO | 3 stacked two-bedroom apartments | In design |
| MBS-P05 | Two-Home InfillPrivate developer | Single-family infill | St. Louis, MO | 2 two-bedroom homes | In design |
| MBS-P06 | 21-Unit Walk-UpPrivate developer | Multifamily | The Ville, St. Louis, MO | 21 units in a three-story building | In design |
| MBS-P07 | Habitat for Humanity HomesHabitat for Humanity Saint Louis | Affordable housing | St. Louis, MO | Two-story single-family homes, two plan types | Estimating |
See the line
Walk the plant before you sign
Tours run Monday to Friday at our 40,000 ft² plant in North St. Louis. Bring your construction manager or your board.
- When
- Mon to Fri
- How long
- 60 minutes
- Where
- 921 N 20th St
What is panelized construction?
Panelized construction is conventional wood framing built in a factory. MBS cuts wall panels and floor cassettes on CNC equipment in St. Louis, closes them with insulation, windows, doors, cladding and MEP rough-in, ships them flat on standard trucks and sets them on your foundation. The finished building is stick-built, not a modular box or a manufactured home.
Is factory-built construction a proven approach?
Yes. Off-site construction has a long history in Germany, Sweden, Japan and the UK. In the U.S., a Department of Energy-commissioned study of 48 modular multifamily projects, summarized by the National Institute of Building Sciences, found them about 30% faster on average than comparable site-built projects. That is modular research, not an MBS claim. MBS was selected through the City of St. Louis Infill RFP, and our team can share relevant project references.
What does shipping cost?
Freight is priced into your estimate based on the truck count and distance. Our standard delivery range is 1,000 miles from St. Louis, and we ship anywhere in America based on project size and project pro forma. Send the site address with your plans.
Is panelized construction code compliant?
Yes. MBS builds to the codes adopted where the building will stand. Before manufacturing, we confirm with the state or local authority which factory approvals and inspections closed panels need, and use approved third-party inspectors where they are permitted. Site permits and inspections still cover the foundation, installation and completion. In St. Louis, for example, the City inspects panels in our factory and again on site, and drywall stays off at panel edges, tops and bottoms so inspectors can see every connection. Some states, Illinois among them, run their own factory-built programs with plan approval, third-party plant inspection and a state seal.
Start a project
Send your plans. Get a fixed factory price.
Permit-ready drawings and a site address are all we need. Your estimate is valid for 30 days, with freight priced in.