Stair design is one of the earliest and most consequential decisions on a custom home — it dictates traffic flow, sight lines, headroom, and the structural layout between floors. Because we design and build on the client’s lot, we start stair coordination during schematic design so the stair’s footprint and elevation are integrated with floor-to-floor heights, bearing walls, and roof/ceiling planes. Early decisions about whether the stair will be a focal architectural element or a compact utility run determine whether we frame oversized openings, locate supporting beams or posts, and reserve space for landings and mechanical chases before framing begins.
On a practical level we translate the stair design into precise framing requirements: exact rough-opening dimensions, header and beam locations, blocking and ledger details for stringer and tread support, and connection points for rail posts. We rely on shop drawings or full-size templates from the stair fabricator or our in-house millwork team to set the framing tolerances, and we verify floor-to-floor rise, finished-floor buildup, and ceiling clearances with the framer on site. Sequencing matters — sometimes we rough-fram a “stair pocket” and install a temporary stair to maintain safe access while final stringers or a prefabricated stair unit are delivered, and we always coordinate when heavy members (glulam headers, steel beams) have to be set before stair installation.
Quality control focuses on measurements, trades coordination, and protecting the assembly during the rest of construction. We coordinate with plumbers, electricians and HVAC to avoid locating ducts or fixtures in stair soffits or pocket walls, and we size and place blocking so railings, balusters and millwork anchors are installed without patchwork. Before finish installation we perform a final stair check — confirming rise/tread dimensions, headroom, and railing anchor alignment — to avoid last‑minute adjustments. This disciplined, shop‑drawing driven approach minimizes rework, keeps the framing schedule on track, and delivers a structurally sound stair that meets code and the aesthetic intent of each RKM Homes custom design.
What rise, run, headroom, and landing clearances should I plan for when designing custom stairs?
We always start by measuring the finished floor-to-finished floor height — include the thicknesses of finished flooring and any tile or hardwood you plan to install. Divide that total rise by a target riser height to get the number of risers; a comfortable riser is usually around 7″ (give-or-take), and the rule of thumb is to keep every riser identical with no more than about 3/8″ variance. For treads, plan on a usable run (tread depth) in the 10″–11″ range for comfortable footing, and remember to account for any nosing projection when you lay out the finished tread edge.
Headroom is one of the most common surprises we correct in the field — many homeowners assume the posted ceiling height is enough, but ductwork, beams, or dropped ceilings can intrude into the stair plane. The commonly accepted minimum headroom is about 6’8″, but we recommend designing for 6’10″–7’0″ when possible to avoid a tight, uncomfortable feel; before finishes go on, a quick mock-up with a straightedge or a temporary board tracing the stair slope will reveal any pinch points. Walk the intended stair path on the job site and sight up the slope at full height so you can identify low spots and adjust stair position or ceiling geometry early.
Landings need to be roomy enough for safe transitions and for any doors that swing into the stair area — a practical minimum is that top and bottom landings be at least as deep as the stair width, and turning stairs require additional depth to allow for natural stepping patterns. Pay attention to where the nosing will sit in relation to doors, windows, or other openings; small offsets often force a change in the number of risers or a landing size. We advise homeowners to mark the stair footprint on the subfloor and adjacent walls with tape or chalk so everyone sees the exact clearances during framing and rough inspections, which prevents late changes and makes final walkthroughs straightforward.
How do builders integrate framing and structural support — stringers, headers, joists, and load paths?
We start every stair layout by locating exactly where the stringers will bear and then following that load down through the framing to foundations. If the stringer bears on a beam or header, that beam has to be sized and supported directly beneath — if it bears on the floor framing, the adjacent joists become trimmers and need to be doubled or reinforced so the stair load doesn’t overload a single joist. As a homeowner, ask your builder to show you the planned bearing points on the rough framing so you can see whether a stair will land on a stud wall, a beam, or a floor span that will need added support.
Headers and trimmer joists around the stair opening are where mistakes show up later, so we always size and detail them before cutting any joists. In practice that means either installing a pre-sized LVL or double/sistered dimensional lumber and adding blocking or hangers where the stringer lands. Ask what material (LVL vs. solid timber) and size your team plans to use, and whether the stringer will be seated on top of a header or hung into it — that decision changes header depth, required fasteners, and whether a post or column below is needed to carry the load to the foundation.
The type of stringer and the connections you choose affect both structure and finish. Cut (open) stringers need a solid bearing surface and often allow easier attachment of newel posts; housed or notched stringers require pocketing into the header and therefore a deeper, stronger header detail. Request blocking for rail posts, confirm that plumbing or ducts won’t be routed through required trimmers, and plan for the contractor to hold a framing walk-through with you so anchor points, post locations, and any columns that show through finishes are identified before drywall or trim go in.
What building codes, permits, and inspections affect custom stair framing in my new Denver home?
When we prepare a permit set for a custom stair, the plan reviewer is checking that the stair assembly is documented and anchored into the structure according to the local adopted code and any Denver amendments. That means your permit application should include plan views, elevation details, and any structural calculations or engineer-stamped drawings for non-standard designs. If you’re choosing a prefab stair, the shop drawings need to be part of the submission so the reviewer can verify the product matches the stamped plans. A practical step for homeowners: ask your builder for a copy of the approved permit set and shop drawings before fabrication starts so there are no surprises on-site.
Inspections are staged so stair compliance is confirmed as the house takes shape. The typical checkpoints we coordinate are rough framing (where inspectors look at how landings, supports and header loads are transferred), a safety check at rough-in (temporary guards and openings secured), and the final inspection (finished handrails, guards, fasteners and attachment details). Inspectors will verify that the stair is installed as-approved rather than relying on later cosmetic finish work, so we avoid installing finished treads or closed-up walls until the appropriate inspections are passed. Homeowners should plan for these hold points in the schedule and expect an inspector to red-tag items that don’t match the approved drawings.
Changes after permit issuance are common but carry cost and time impacts because the building department requires either revised plans or an alternate-method approval. If you decide on a different stair profile or a glass guard, we put that change into a revised shop drawing and, when needed, obtain a structural engineer’s sign-off before resubmitting. That keeps inspections clean and avoids field rework. A useful tactic for owners is to finalize stair style and materials during the contract design phase so the builder can lock details into the permit — it minimizes addenda, keeps inspection approvals smooth, and reduces the chance of delays or change-order costs.
When should stair work be scheduled, and how do builders coordinate framers, prefab installers, and finish carpenters?
We schedule stair work as a trade that bridges rough framing and finish trades, so the timing is deliberate: rough openings and blocking are completed during the framing stage, then we bring the stair contractor in once mechanicals have their rough-ins in place and the house is weather-tight. For prefab stairs we arrange delivery to fit a narrow window where the unit can be set and protected before finish flooring and trim are installed; for site-built stairs the carpenters work on-site during the finishing phase but still after the heavy framing so they can use the structure as support. From our experience, getting the stair trade the correct access window is the single biggest scheduling constraint—if you delay decisions about finishes or handrail style, the whole sequence can slip.
Coordinating the other trades is mostly about who needs to work above, below, or through the stair opening: electricians must have light locations and switch boxes roughed in before stair installation if switches mount to adjacent newel posts or stringer walls, drywallers need a plan for edges where the stair meets walls, and flooring crews need to know whether stair treads will be wrapped with the same material or installed separately. We routinely set clear responsibilities in our schedule so the framers install blocking for rail attachments, the stair crew knows when access is clear for installation and protection, and finish carpenters follow with trim and balusters. Practical homeowner note: tight access, big deliveries, and on-site protection (temporary coverings and dust control) are things we coordinate ahead of time to prevent damage and minimize rework.
What homeowners can do to keep the sequence smooth is make key finish decisions early, confirm the stair trade’s lead time with your builder, and allow clear access on the planned install day(s). Ask your builder for a simple sequencing timeline that shows when the stair will be set relative to drywall, flooring, and railing installation so you know when the house will be noisier or less accessible. Also request that the contract specify who handles protection and repairs for other trades’ damage to stairs—clear accountability and a realistic contingency for schedule shifts save money and frustration during this tightly choreographed phase.
How do shop drawings and site measurements make sure my custom stairs fit the framing?
Shop drawings are the working blueprint for the stair manufacturer and the framers — they show plan and elevation, finished floor elevations, stringer locations and cut patterns, landing sizes, newel/post locations, attachment details and the finish thicknesses we’ve allowed for. As an experienced builder I insist we don’t sign off on those drawings until the homeowner has finalized flooring and nosing choices, because a 3/8″ hardwood build-up or a 1/2″ carpet pad changes tread rise and nosing clearance. Practical step: require the stair shop drawing to call out finished-floor elevations and the exact finish thicknesses used to calculate riser heights so everyone is working to the same numbers.
Field measurement happens after rough framing and subfloor are in place but before stair manufacture. We have either the stair fabricator or our lead trim carpenter come to the job with the shop drawing and physically measure finished-floor elevations, subfloor thickness, header heights, wall plumb and squareness, and any adjacent framing/blocking required for attachment. Homeowners should ask to be on-site for that verification or ask for the measurement report and photos — if the opening, ceiling height, HVAC, or electrical clearances differ from plans, we resolve those with the framer then so blocking and header locations are installed to the exact coordinates the stair shop measured.
Tolerances and allowances are the practical piece that prevents costly rework. Building code allows limited variance in riser height (code-controlled; typically not more than 3/8″ variation between risers), but in practice we target tighter manufacturing tolerances — usually 1/8″–1/4″ on riser and tread dimensions — and leave 1/4″–1/2″ clearance around landings or openings for final shim and trim. Ask the stair shop and your builder to put those tolerances on the shop drawing, include an “as-built measurement” clause (stating they will re-measure and adjust if framing changes), and schedule the measurement before fabrication; that combination of accurate shop drawings, confirmed site measurements, and agreed tolerances is how we protect your timeline and avoid visible gaps or uneven steps after installation.