Framing Subcomponents: Prebuilt Headers, Door Legs and Stud Packs
Module Building Systems
Framing subcomponents are the repeat parts of a wall frame, like matched king/jack leg assemblies, header build-ups and stud packs, built before your crew starts layout. At Module Building Systems (MBS), we cut and nail them on our CNC line in St. Louis so your framers spend the day setting walls instead of building parts on the deck.
Crews are thin right now. In the September 2026 NAHB/Wells Fargo Housing Market Index survey, 57% of builders reported a shortage of framing crews, up 9 percentage points since April 2025 and the biggest jump of the 16 trades surveyed (NAHB Eye on Housing, October 14, 2026). The same survey put the nine-trade shortage average at 47%, higher than at any point in the 2004 to 2006 housing boom.
What are framing subcomponents?
Framing subcomponents are the small assemblies that show up in every wall: a king stud fastened to its jack, a header built up to the plies on the drawings, a stud pack under a girder. A typical house needs dozens of them. Each one means pulling lumber, measuring, cutting and nailing before the wall can go together.
We build them ahead of time. Our framing supply covers matched king/jack leg assemblies, specified header build-ups, door components, stud packs, channels, Els and other repeat assemblies we agree on with you. Header size, plies, bearing and fastening follow your project drawings.
Door legs ready for the opening
Order the matched king/jack legs and the header for each door, and your crew installs them to the door's rough-opening schedule. The legs come paired. The header is already built. The crew marks the plates, drops the parts in and moves to the next opening.
Stud packs, channels and Els
Point-load stud packs, channels and Els at wall intersections are the parts crews build over and over on every job. They are a good fit for the factory because they repeat. If a part shows up on every floor of a project, it belongs on our line.
Why buy prebuilt headers and king/jack legs?
Prebuilt headers and king/jack legs save your crew's best hours for the work that needs judgment. Cutting and nailing repeat parts has to get done, but it does not need your lead carpenter. Plumbing, bracing and connecting walls does.
Labor costs keep climbing too. The same NAHB report found the median increase in labor cost for the same home was 4.2% over the previous 12 months. When you cannot hire another framer, the next move is to take hours out of every wall. We covered the wider picture in our post on the construction labor shortage.
Subcomponents are also the easiest way to try factory-built framing. You keep your layout, your plates, your sheathing schedule and your set. The only change is a stack of parts on the truck, built to the drawings. When that goes well, the next step is framed or sheathed wall panels.
How does our CNC line build framing subcomponents?
Our CNC crosscut saw and CNC subcomponent nailer prepare the parts. The saw cuts within 1/16 inch: its specified length-stop positioning is +/-1 mm, about 0.039 in. That figure describes how the saw positions each cut. It is a cutting spec, not a tolerance for a finished assembly or a field set.
The nailer uses camera recognition. It reads the component type and size, feeds the assembly and fastens it with servo-positioned nailing to the configured pattern. A header in the morning gets the same nailing as a header at the end of the shift.
On our floor the work runs CNC cut, then subcomponent nail, then panel assembly. A subcomponent order leaves before panel assembly and goes to your job. Header fabrication and final opening assembly follow the confirmed scope, so your quote lists exactly which parts we build and which ones your crew keeps.
What changes for your crew on site
Less cutting. More setting. Parts arrive with agreed identification marks and documentation, so your foreman can match the delivery list to the plan for each floor. Freight, racks, unloading and equipment responsibilities are set for each order before anything ships. Our post on flat-pack panel delivery covers truck access and staging.
Your crew keeps the field work. They lay out, set, connect and brace, the same as today. Our framing makes your crew faster; it does not replace them. That is how we work with contractors and framers.
How do you price framing subcomponents against stick framing?
Price the same completed scope both ways. On the factory side, count the supplied assemblies, freight and unloading. On the site side, count the lumber you would buy, the cutting and assembly hours, the waste, and the field completion your crew still owns. Use your own crew rates and your own assumptions.
Our supply quote is project-specific. It covers only the framing and factory work it lists, and product mix, quantity, details and delivery requirements set the number. Send us:
- Current plans: framing and structural details, openings and the drawing revision
- The products you want: subcomponents alone, or with framed walls, sheathed walls, floor panels or roof panels
- The site: address, target date, delivery timing and known access limits
- Your field approach: crew, equipment and the work you plan to keep
Bring us the parts that slow you down. We will tell you which ones fit our line. The full flow from drawings to delivery is on our how it works page.
About Module Building Systems
Module Building Systems (MBS) is a panelized offsite construction company founded in 2023 and based at 921 N 20th Street in St. Louis, Missouri. We build wall, floor and roof panel packages in a 40,000 sq ft CNC manufacturing facility and ship them flat-packed within 1,000 miles. Projects run up to 30% lower in cost and up to 50% faster, with up to 90% less waste. Actual schedules depend on project scope, approvals, site readiness, materials and logistics. Learn more about MBS.
Frequently asked questions
What is the difference between a king stud and a jack stud?
A king stud runs full height from bottom plate to top plate beside an opening. A jack stud, also called a trimmer, is fastened to the king and carries the header. We build them as matched king/jack leg assemblies, sized and fastened to your project drawings, so your crew installs a finished pair at each rough opening.
Who sizes the headers in a subcomponent order?
Your project drawings do. Header size, plies, bearing and fastening come from the plans and structural details you send us. We build each header to those details and list it in the quote. If the drawings change, send the new revision so every header matches the current set.
Can I order framing subcomponents without wall panels?
Yes. Subcomponents are one of five products we sell to framers, and you can buy them on their own. You can start with door legs and headers on one job, then add framed wall panels, sheathed wall panels, floor panels or roof panels on the next one once you see how the parts fit your workflow.
Are factory-built framing parts code compliant?
The adopted code governs every job, along with the engineered drawings and fastener schedules. Factory-built framing is conventional wood framing built to those documents. We build to the released drawings and the agreed fastening. Confirm inspection requirements with your local building department before the job starts, the same as any framing job.
How do I get a price on framing subcomponents?
Send current plans with framing and structural details, the drawing revision, the parts you want, the site address and target date. Tell us what work your crew will keep. We return a project-specific supply quote that lists every assembly, plus freight and unloading responsibilities, so you can compare it with stick framing on the same scope.
Start with one framing job
Send one current set of drawings and we will price the subcomponents for it. Get an estimate, book a factory tour to watch the saw and nailer run, or email info@modulebs.com.
Framing subcomponents are the repeat parts of a wall frame, like matched king/jack leg assemblies, header build-ups and stud packs, built before your crew starts layout. At Module Building Systems (MBS), we cut and nail them on our CNC line in St. Louis so your framers spend the day setting walls instead of building parts on the deck.
Crews are thin right now. In the September 2026 NAHB/Wells Fargo Housing Market Index survey, 57% of builders reported a shortage of framing crews, up 9 percentage points since April 2025 and the biggest jump of the 16 trades surveyed (NAHB Eye on Housing, October 14, 2026). The same survey put the nine-trade shortage average at 47%, higher than at any point in the 2004 to 2006 housing boom.
What are framing subcomponents?
Framing subcomponents are the small assemblies that show up in every wall: a king stud fastened to its jack, a header built up to the plies on the drawings, a stud pack under a girder. A typical house needs dozens of them. Each one means pulling lumber, measuring, cutting and nailing before the wall can go together.
We build them ahead of time. Our framing supply covers matched king/jack leg assemblies, specified header build-ups, door components, stud packs, channels, Els and other repeat assemblies we agree on with you. Header size, plies, bearing and fastening follow your project drawings.
Door legs ready for the opening
Order the matched king/jack legs and the header for each door, and your crew installs them to the door's rough-opening schedule. The legs come paired. The header is already built. The crew marks the plates, drops the parts in and moves to the next opening.
Stud packs, channels and Els
Point-load stud packs, channels and Els at wall intersections are the parts crews build over and over on every job. They are a good fit for the factory because they repeat. If a part shows up on every floor of a project, it belongs on our line.
Why buy prebuilt headers and king/jack legs?
Prebuilt headers and king/jack legs save your crew's best hours for the work that needs judgment. Cutting and nailing repeat parts has to get done, but it does not need your lead carpenter. Plumbing, bracing and connecting walls does.
Labor costs keep climbing too. The same NAHB report found the median increase in labor cost for the same home was 4.2% over the previous 12 months. When you cannot hire another framer, the next move is to take hours out of every wall. We covered the wider picture in our post on the construction labor shortage.
Subcomponents are also the easiest way to try factory-built framing. You keep your layout, your plates, your sheathing schedule and your set. The only change is a stack of parts on the truck, built to the drawings. When that goes well, the next step is framed or sheathed wall panels.
How does our CNC line build framing subcomponents?
Our CNC crosscut saw and CNC subcomponent nailer prepare the parts. The saw cuts within 1/16 inch: its specified length-stop positioning is +/-1 mm, about 0.039 in. That figure describes how the saw positions each cut. It is a cutting spec, not a tolerance for a finished assembly or a field set.
The nailer uses camera recognition. It reads the component type and size, feeds the assembly and fastens it with servo-positioned nailing to the configured pattern. A header in the morning gets the same nailing as a header at the end of the shift.
On our floor the work runs CNC cut, then subcomponent nail, then panel assembly. A subcomponent order leaves before panel assembly and goes to your job. Header fabrication and final opening assembly follow the confirmed scope, so your quote lists exactly which parts we build and which ones your crew keeps.
What changes for your crew on site
Less cutting. More setting. Parts arrive with agreed identification marks and documentation, so your foreman can match the delivery list to the plan for each floor. Freight, racks, unloading and equipment responsibilities are set for each order before anything ships. Our post on flat-pack panel delivery covers truck access and staging.
Your crew keeps the field work. They lay out, set, connect and brace, the same as today. Our framing makes your crew faster; it does not replace them. That is how we work with contractors and framers.
How do you price framing subcomponents against stick framing?
Price the same completed scope both ways. On the factory side, count the supplied assemblies, freight and unloading. On the site side, count the lumber you would buy, the cutting and assembly hours, the waste, and the field completion your crew still owns. Use your own crew rates and your own assumptions.
Our supply quote is project-specific. It covers only the framing and factory work it lists, and product mix, quantity, details and delivery requirements set the number. Send us:
- Current plans: framing and structural details, openings and the drawing revision
- The products you want: subcomponents alone, or with framed walls, sheathed walls, floor panels or roof panels
- The site: address, target date, delivery timing and known access limits
- Your field approach: crew, equipment and the work you plan to keep
Bring us the parts that slow you down. We will tell you which ones fit our line. The full flow from drawings to delivery is on our how it works page.
About Module Building Systems
Module Building Systems (MBS) is a panelized offsite construction company founded in 2023 and based at 921 N 20th Street in St. Louis, Missouri. We build wall, floor and roof panel packages in a 40,000 sq ft CNC manufacturing facility and ship them flat-packed within 1,000 miles. Projects run up to 30% lower in cost and up to 50% faster, with up to 90% less waste. Actual schedules depend on project scope, approvals, site readiness, materials and logistics. Learn more about MBS.
Frequently asked questions
What is the difference between a king stud and a jack stud?
A king stud runs full height from bottom plate to top plate beside an opening. A jack stud, also called a trimmer, is fastened to the king and carries the header. We build them as matched king/jack leg assemblies, sized and fastened to your project drawings, so your crew installs a finished pair at each rough opening.
Who sizes the headers in a subcomponent order?
Your project drawings do. Header size, plies, bearing and fastening come from the plans and structural details you send us. We build each header to those details and list it in the quote. If the drawings change, send the new revision so every header matches the current set.
Can I order framing subcomponents without wall panels?
Yes. Subcomponents are one of five products we sell to framers, and you can buy them on their own. You can start with door legs and headers on one job, then add framed wall panels, sheathed wall panels, floor panels or roof panels on the next one once you see how the parts fit your workflow.
Are factory-built framing parts code compliant?
The adopted code governs every job, along with the engineered drawings and fastener schedules. Factory-built framing is conventional wood framing built to those documents. We build to the released drawings and the agreed fastening. Confirm inspection requirements with your local building department before the job starts, the same as any framing job.
How do I get a price on framing subcomponents?
Send current plans with framing and structural details, the drawing revision, the parts you want, the site address and target date. Tell us what work your crew will keep. We return a project-specific supply quote that lists every assembly, plus freight and unloading responsibilities, so you can compare it with stick framing on the same scope.
Start with one framing job
Send one current set of drawings and we will price the subcomponents for it. Get an estimate, book a factory tour to watch the saw and nailer run, or email info@modulebs.com.