At RKM Homes, framing a staircase is one of the first structural moves that turns a set of plans into a usable, safe vertical circulation route in a Denver custom home. Because we design and build on the client’s lot, stair layout is coordinated early with floor-to-floor heights, window and ceiling placements, and local code requirements so the stairwell fits the house geometry without costly rework. We start by confirming the permitted stair geometry — typical residential guidelines we use as a baseline are a maximum riser of about 7 3/4″, a minimum tread depth of roughly 10″, and a minimum headroom of 6 ft 8 in — and then calculate an even number of risers for comfortable, code-compliant steps. Those dimensions drive the rough opening size, landing locations, and where structural members like headers and trimmer joists must be placed.
On the jobsite the physical framing breaks down into a few clear elements: stringers (site-cut 2x12s or prefabricated), treads and risers (framing carriers or finished material allowances), landings and intermediate supports, and guard/handrail blocking. For common straight runs we typically use 2×12 stringers notched to carry treads, or an LVL carrier when spans or loads require it; open-riser, boxed, or return stringer details are selected based on the architectural intent and finished tread thickness. Headers and double trimmer joists are installed where the stair meets the upper floor; those members take bearing from posts or walls and are sized to carry the stair load into the foundation framing. We also install blocking and nailers at handrail and guard locations so the safety systems can be anchored solidly when finish carpenters install balusters and newel posts.
Because stairs intersect many trades, we coordinate the framing sequence with HVAC, electrical and the finish team to reserve chases, light locations, and finished floor and tread thicknesses. Prefabricated stair units can speed construction and reduce site cutting, but for many custom layouts — winding stairs, curved runs, or integrated landings — site-built framing gives the control needed to meet the design and maximize headroom and aesthetics. Throughout the framing stage we document the stair geometry for permitting and inspections, verify load-bearing connections and final clearances, and confirm the finish profiles so what’s framed rough will accept the hardwood, carpet, tile or custom trim the client selects.
What stair layout and building-code requirements affect how my custom home’s stairs are framed?
As a builder I start every stair framing job by locking in the code-driven dimensions because they dictate the whole geometry: maximum riser height (commonly 7 3/4″), minimum tread depth (commonly 10″), minimum headroom (commonly 6’‑8″), and minimum clear width (commonly 36″). Those numbers determine how many risers you’ll need between floors, the total run of the stair, and where landings must occur. Local jurisdictions can tweak these limits, so I always check the approved plans and local code before cutting stringers or setting beams.
Practically, the first step on site is to measure the finished floor‑to‑finished floor height and divide that by a target riser (I try to get an even number of risers with each riser between about 6 7/8″ and the code maximum). If the math doesn’t work out evenly, I adjust tread depth or the number of risers slightly so all risers match within 3/8″ — inconsistent risers are the most noticeable defect to occupants. That calculation produces the total run, which tells me how much framing space to reserve in the layout (including landing length and any intermediate platforms) and whether we need to shift upstairs floor framing to maintain proper headroom under beams or ductwork.
Landings and clearances are where layout problems usually show up during framing. Building codes require a landing at the top and bottom of flights with a minimum dimension at least as deep as the stair width and often not less than 36″, and the swing of doors onto a landing is tightly controlled; I always verify door swings on the layout so a door doesn’t hit a stair. I also coordinate early with the structural engineer and MEP trades to keep beams, headers and duct chases out of the 6’‑8″ headroom envelope — if a beam ends up too low we may have to raise the header or reconfigure the landing, which is far costlier after framing is complete. Before sheathing I walk the framing with the homeowner to confirm riser count, tread feel, landing placement and headroom so there are no surprises once the finish stairs go in.
What are the structural framing components of a stair — stringers, treads, risers, headers, newel and guard posts?
As a custom home builder I look at stair framing as a system made up of a few distinct parts: the stringers that form the sides and profile, the treads you step on, the risers that close the vertical face, the header or framed opening at the top of the run, and the newel/guard posts that anchor the handrail. For homeowners, the practical takeaway is to ask to see the stair detail on your plans and the rough framing on site so you can confirm each of those pieces is present, properly cut and fastened, and aligned with the finished layout you expect. When these elements are laid out correctly you avoid squeaks, uneven steps and problems later when trim and railing are installed.
Stringers should run full-length with consistent spacing where visible, clean cuts where the treads seat, and secure fasteners where they meet landings or the top opening; look for tight joints at the tread/riser intersections and no gaps that would cause movement. Treads are typically screwed (and often glued at the tread-to-stringer interface) so they don’t flex underfoot — on-site you can ask the crew to point out fastener locations and whether they’re using fasteners from below or through the tread edge so the finish work will be clean. Riser installation is equally practical: risers should sit flush against the tread nose and be fastened so they won’t separate when stairs are in use, which is the most common source of clicking or uneven sound.
Newel and guard posts are the visible structural anchors for your rail and must be tied into a solid member below or behind the finished surface; I always show customers where those post locations fall relative to floor framing or stair members and explain the reinforcement we’ll use so posts won’t loosen over time. Ask to see how each post will be fastened — whether it’s bolted to a joist, through-bolted to a plate, or strapped to a stair member — and request that post locations be adjusted, if possible, before finish work so trim and balusters line up exactly where you want them.
How are stairs integrated with the house framing and how is their load transferred to the foundation?
On our jobs we treat a stair as a structural element that needs clear bearing points from day one. The typical arrangement is the top of the stair bearing into the upstairs floor framing (a header or ledger attached to the rim joist or a trimmer assembly) and the bottom bearing into a beam, bearing wall, or a post that carries load down to a footing. If the stair lands on a second-floor framing member, we trim and double up joists around the stair opening and install a header or LVL so the stair loads don’t rely on a single joist; if the lower end falls mid-span of a room, we plan for a post and beam or a continuous foundation wall under that post.
Load transfer details matter because stair landings create concentrated loads rather than uniform floor loads. We normally carry those point loads with posts bearing on beams or directly to a foundation wall; where a post is required below a landing we set its location over a bearing beam or prepare a pad footing in the foundation plan. Hangers, structural screws, and engineered headers are used at the connections so the load path is continuous—stringer bearings sit on the header or beam, posts are bolted to beam hardware that’s tied to footings, and any cantilevered or open-stringer conditions get an engineered solution so the stair doesn’t introduce deflection or squeaks.
Practical homeowner advice: pick your stair location early so it lines up with beams or bearing walls — that saves you from an unsightly post in the living space and avoids expensive foundation changes. Expect to see temporary shoring during framing and permanent posts or beams exposed in basements/garages where stair loads are carried down. Ask your builder or structural engineer to show you the load path on the framing plan (where the header, trimmers, posts, and footings will be) before finishes start so you understand why certain beams or posts are where they are and so last‑minute layout changes don’t become costly structural fixes.
Which framing methods and materials are best for stair construction in a custom home — cut or housed stringers, prefabricated units, and wood vs LVL vs steel?
When I decide between cut stringers, housed stringers, or a prefabricated stair unit, the tradeoffs come down to site tolerance, appearance, and budget. Cut stringers (the common saw-tooth type) are fast and economical for straight runs with short spans, but they limit nosing and tread thickness options and show the saw cuts on the finished side. Housed stringers accept the tread into a routed pocket and produce a cleaner closed look and better load distribution for thicker hardwood treads, but they take more shop time. Prefabricated stairs buy you precision and faster onsite install — I always require shop drawings up front — but they need exact rough openings and a few weeks lead time and typically cost more than a well-built site stair.
Choice of material changes what the stair can do and how it connects. Solid-dimension lumber is fine for standard residential spans and is easiest to finish in-place, but for longer runs, open-riser or modern “floating” looks, we usually specify LVL stringers (for stiffness and consistent camber) or steel stringers (for narrow profiles and longer spans). LVL gives you a wood substrate that can be skirted or wrapped in hardwood; steel permits very slim profiles and wide unsupported runs but requires corrosion protection, welded/bolted connections, and a structural engineer’s calcs. Material selection also affects vibration and sound — stiffer LVL or steel reduces bounce and future squeaks compared with undersized green lumber.
Practical things homeowners should ask for before framing starts: request stair shop drawings that show stringer type, material, bearing locations and tolerances; confirm lead time for any prefab or engineered stringer so rough openings are framed to the exact dimension; and make sure the contract calls out who is responsible for finish thicknesses (hardwood treads, nosing, carpet) so the carpenter frames the housed stringer or landing at the correct elevation. If we’re using LVL or steel I involve a structural engineer and specify connection details (bolts, plates, welding) and protective coatings; for site-built wood stairs I insist on blocking at treads and newel posts and inspection for deflection so the finished stair is quiet, solid, and fits the trim the way you expect.
What rough openings, landings, blocking and fire/soundstopping do I need for handrails, guards and finishes?
When we frame the stairwell rough opening I make sure the opening is laid out to accept the finished guard and any trim without chasing blocking later. That means framing the rough edge at the correct finished width plus the thickness of drywall/trim and installing full-depth backing where the guard posts and handrail brackets will land. For landings I carry through solid joist or header bearing under the finished landing and leave the top of the landing framing exposed long enough to locate and fasten the guard posts; if a landing butts to an exterior wall I provide a continuous ledger and plywood backing to accept the guard post baseplate and trim.
Blocking for handrails and newel/guard posts is structural work, not cosmetic, so I always set the blocking before insulation and drywall. Typical practice is to install full-depth 2x blocking or plywood packs between studs at every post location and behind any runs of handrail where brackets will attach; for high-load guards I spec laminated 2×10 blocking, bolted or screwed through to the adjacent studs or rim joist so you can fasten the post with through-bolts or heavy structural screws later. Mark and photograph the blocking locations before drywall goes on, and ask your builder to leave a small access panel or removable base for future tightening or retrofit of hardware — that prevents destructive work if guard hardware needs adjustment down the road.
Fire- and soundstopping around stair openings is both a safety and a comfort item I never skimp on. I install fireblocking at the top and bottom of the stair cavity and at any concealed vertical chases (mineral wool or approved fireblocking material stuffed and sealed with intumescent caulk), and where pipes or wiring penetrate the stair shaft I seal with rated sealant or fire collars to maintain the required rating. For sound control I fill voids at the floor/ceiling interface with mineral wool and use acoustical sealant around the perimeter before drywall; request that the framing crew call out all fire- and soundstopping locations on the plans so the inspector and finishing crew verify them before finishes are installed.