Keeping the Vision Intact: Designing in Timber Without Losing Authorship

Architects integrate prefabricated timber frame most effectively when three things happen early: the timber manufacturer joins the team during schematic design, structural intent is coordinated through a shared BIM model, and the decisions that matter most, connections, tolerances, and interfaces, are resolved before construction documents are issued.

In that model, the manufacturer is not reacting to finished drawings. The manufacturer is part of the design-assist team, contributing feasibility review, structural integration, fabrication-level detailing, and model-based coordination while architectural authorship remains with the architect.

That shift matters because prefabricated timber changes the workflow itself. Decisions move earlier, geometry carries more weight, and design intent is best protected through coordination in the model rather than interpretation in the field.

This guide outlines when to engage the manufacturer, what to expect at each phase, and how CNC capacity, connection detailing, enclosure interfaces, and engineering coordination come together, reinforced by a completed lake home in New Hampshire designed by TMS Architects & Interiors and delivered with Canadian Timberframes as the design-assist partner.

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The Proof: a New Hampshire Lake Home

The project was a year-round retreat in the Lakes Region of New Hampshire, replacing a 1913 family camp. The client wanted the warmth of exposed structure in a more refined expression, not overly rustic, but still warm and expressive.

TMS Architects & Interiors developed a hybrid timber strategy. Canadian Timberframes joined as a design-assist partner to help protect that intent as the timber scope expanded from a few rooms to nearly the entire home. The result shows what this approach can deliver: a hybrid structural concept held intact, a broader timber presence integrated without losing clarity, and a finished home where the original architectural direction remained visible through execution.

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For the full project story, see the Design Assist Case Study for Architects.

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Why prefabricated timber changes the architectural workflow

With prefabricated timber, the structure is modeled, fabricated, and delivered as a precision package. That moves key architectural decisions forward and raises the level of coordination the team needs to maintain.

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What changes for the architect

• More structural decisions land during schematic design and design development, not during construction documents.
• Hybrid interfaces need to be resolved before site work begins.
• Timber geometry must align with enclosure, glazing, and interior finish intent.
• Revisions become more consequential once the fabrication model is approved.

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The New Hampshire project shows why this matters. As the design progressed, timber grew from a limited scope into a defining element across most of the home. That strengthened the architecture, but it also increased member counts, connection complexity, and coordination demands. Early design-assist allowed the team to absorb that growth without abandoning the original hybrid strategy.

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"Because timber was central to the concept, I leaned on CTF's expertise. With experts at the table, I wanted to give them the freedom to enhance the design." — Jason Bailey, Principal, TMS Architects & Interiors

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When should the manufacturer be engaged?

Earlier than many teams expect.

Schematic design is the ideal entry point when:

• exposed timber is a primary architectural element
• the project includes long spans or feature trusses
• hybrid timber-steel logic is already emerging
• the structure is expected to shape the architectural language

By design development, key timber decisions are already beginning to lock

By DD, the team is often starting to fix:

• member sizing
• connection types
• steel integration
• enclosure interfaces
• opening, penetration, and tolerance coordination

At that stage, bringing the manufacturer in is still possible, but the work is more likely to focus on adjustment than early design refinement.

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Why timing matters

Prefabricated timber carries structural and dimensional implications that do not layer in cleanly after the architecture is largely complete. CNC capacity, joinery options, member-size limits, material strategy, and connection geometry all influence SD and DD decisions.

When the manufacturer is engaged late, the timber package has less room to contribute to the architectural solution. That usually reduces flexibility and adds time, cost, or coordination pressure later in the process.

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What the architect should be getting from the manufacturer at each phase

In schematic design
At this stage, the manufacturer's value is early technical clarity around:

• which timber gestures are structurally efficient
• where exposed timber adds the most architectural value
• whether span assumptions are realistic
• whether the emerging geometry fits fabrication logic
• where hybrid structure can simplify the project without diluting intent

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In design development
By DD, the manufacturer should be helping the architect resolve:

• member sizing before proportions harden in the documents
• connection types before visual language is assumed
• steel integration before it becomes a coordination issue
• interface conditions before enclosure details are fixed
• scope and budget implications before the package is priced too loosely

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In construction documents
By CD, the value shifts from concept support to precision coordination. At that stage, the architect should be getting:

• a shop model that can be checked against the architectural model
• connection details aligned with the design intent
• fabrication tolerances coordinated with adjacent systems
• engineering and shop-drawing information that reduces field interpretation
• model-based interface resolution before bid or contract

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"CTF's approach is to support the architect. They're not trying to take over the design. They let us lead, support the design intent, and step in with thoughtful input when needed." — Jason Bailey, TMS Architects & Interiors

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How BIM-driven collaboration changes the process

Prefabricated timber runs on 3D models, not 2D drawings alone. The model becomes the source of truth for fabrication: it drives CNC output, produces shop drawings, and supports the on-site assembly sequence.

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What it changes

• The model needs to be coordinated, not only the drawing set.
• Timber geometry is checked against structural logic earlier.
• Hybrid conditions get resolved before they become field issues.
• Window openings, MEP routes, and enclosure interfaces are coordinated to the actual fabricated structure.

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A 2D-based process can appear resolved while still hiding conflicts in three-dimensional geometry. Once the timber fabrication model is built, those conflicts surface quickly.

On the New Hampshire home, direct 3D model exchange between TMS, the structural engineers, Canadian Timberframes, and the builder allowed the team to evaluate scope changes early, refine member sizing and connection strategies without altering the visual outcome, and resolve hybrid interfaces before construction.

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"The BIM model is the single biggest safeguard of design intent, because the model rarely lies when it's built with enough detail." — Jason Bailey, TMS Architects & Interiors

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Typical file exchange formats

Canadian Timberframes interfaces with common architect-side BIM workflows, including:

• Revit
• IFC
• DWG

The fabrication model is shared back for coordination, and overlaying the architectural BIM with the timber shop model becomes part of the quality-control process.

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What CNC capacity lets you draw with confidence

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A realistic understanding of CNC capacity changes what can be committed to during SD and DD.

Canadian Timberframes' Hundegger K2i six-axis robotic CNC handles members up to:

• 51 inches maximum member width
• 17.5 inches maximum member height
• 60 feet or more maximum member length

Typical joinery and machining capabilities

• mortise-and-tenon
• through-tenon
• dovetail
• scarf joints
• custom angle cuts
• concealed fastener pockets
• coordinated custom steel-plate connections

What that makes possible

• longer clear spans without immediately defaulting to glulam where solid sawn timber is desired
• complex roof geometry, including hipped, valley, and compound-angle conditions
• visible joinery as a regular architectural move, not a special exception
• coordinated timber-to-steel connection design early in the detailing process

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How connections are detailed

Connection design is often the most consequential point of architect-manufacturer collaboration. It affects structural engineering, visual character, fabrication time, and installation speed all at once.

Three patterns recur most often

1. Concealed connections — Steel knife plates, pinned hangers, and other hidden systems integrated within the timber. Best suited to cleaner architectural lines, restrained modern timber language, and conditions where visual simplicity is the priority.
2. Expressed traditional joinery — Mortise-and-tenon, through-tenons with pegged or wedged keys, scarf joints, and lap joints. Best suited to visible craft expression, structural legibility, and rustic, chalet, and warm-modern applications.
3. Custom steel connections — Black powder-coated, hot-dipped galvanized, or primed steel plates and brackets designed to remain visible. Best suited to sculptural contrast, mixed-material work, demanding structural conditions, and modern architectural language.

Most projects use all three. The question is not which connection type should govern the entire project. The question is which pattern belongs where.

A great-room truss may justify expressed joinery. A clean entry assembly may benefit from concealed steel. A transfer condition may call for visible custom steel. The manufacturer's role is to help the architect understand which solutions are most efficient to fabricate, ship, and install once the visual direction is set.

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How engineering coordination works

Structural engineering on a prefabricated timber frame is typically layered across three parties.

The architect's structural engineer
Responsible for:

• the building's overall load path
• lateral system strategy
• foundation design
• broader system coordination

The timber manufacturer's design team
Responsible for:

• the timber-specific shop model
• member sizing development
• connection detailing
• fabrication-level coordination

The manufacturer's structural engineer
Responsible for:

• stamping the timber package shop drawings
• confirming code and load compliance for the timber scope
• coordinating with the engineer of record on connection capacities and load transfer

Typical coordination topics

• lateral load transfer between the timber frame and the rest of the building
• long cantilevers and dropped beams
• transfer girders and hybrid logic
• connection capacities at timber-to-steel and timber-to-building interfaces

On the New Hampshire home, Evergreen Structural Engineering and CTF's engineers worked closely to refine exactly these conditions where the hybrid structure relied on both framing systems.

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"We had several instances where coordination was key, especially around how the hybrid structure relied on both framing systems. Our engineers and CTF's engineers worked closely to refine those details." — Jason Bailey, TMS Architects & Interiors

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What's different about working with a prefabricated timber frame manufacturer

Decisions move earlier
By DD, structural member strategy, major connection types, surface texture and finish direction, joinery decisions, and enclosure interface logic are often substantially committed.

Changes become more expensive after model lock
Once the shop model is approved, changes to geometry, member sizing, and major dimensions tend to cascade through engineering, shop drawings, and fabrication lead time.

Site work is faster, but less forgiving
A well-coordinated residential raise moves quickly, but foundation tolerances, embed locations, adjacent trades, and interface conditions all have to match the assumptions built into the model.

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The architects who do this well work differently

The architects who integrate prefabricated timber successfully tend to do three things consistently:

• They pull key structural and interface decisions forward.
• They coordinate continuously against the BIM and shop model, not only the drawing set.
• They treat the manufacturer's design team as a collaborator on detailing, not a downstream supplier reacting to finished documents.

Prefabricated timber changes not only what gets built, but how the design team works.

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Final thoughts

The strongest architect-led timber projects protect design intent by resolving structural logic, fabrication constraints, and interface detailing while the design is still flexible.

For architects, that means engaging the timber manufacturer early, working in coordinated BIM-driven models, and using design-assist to refine, not redirect, the architectural idea. The New Hampshire lake home is proof: a hybrid strategy held intact, timber scope grown with intent, and a client who loved the result.

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Frequently asked questions

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When should I bring a timber frame manufacturer into my project?
Schematic design is ideal when exposed heavy timber is a primary architectural element. Design development is the latest practical engagement point for CNC-fabricated timber, glulam, CLT, or hybrid timber-steel structure.

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What file formats do timber manufacturers work in?
Canadian Timberframes works in advanced 3D CAD modeling software and can exchange Revit, IFC, DWG, and other common architectural formats. The fabrication model is then shared back for coordination.

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What is the maximum size of CNC-fabricated timber members?
The Hundegger K2i robotic CNC handles members up to 51 inches wide, 17.5 inches high, and 60 feet or more in length. Conditions beyond that range are typically handled with glulam strategies or coordinated splice details.

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Who is responsible for structural engineering on a prefabricated timber frame?
The project structural engineer of record establishes the building's overall load path. The timber manufacturer's structural engineer stamps the shop drawings for the timber package and coordinates on connection capacities and load transfer.

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How are connections between timber and other building systems detailed?
Through full-scale interface detailing during DD. Wall-to-column, roof-to-wall, window opening, and MEP penetrations should all be coordinated against the timber shop model before construction documents are finalized.

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Can I change the design after shop drawings are approved?
Yes, but those changes are usually costly and slow. Major geometric or dimensional revisions after model lock tend to cascade through engineering, shop drawings, and fabrication lead time.

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