Mass Timber vs Concrete at 12 Storeys: What Dartmouth’s Feasibility Study Found

A feasibility study released in spring 2026 offers something timber construction debates often lack: two optimized designs for the same proposed 12-storey residential building. One uses mass timber and the other concrete. The Dartmouth, Nova Scotia comparison does not produce a simple winner. It shows where timber costs more, where time changes the calculation, and why a fair comparison must start before the structure is fixed.

What the study compared

The team developed parallel schemes for a rental building rather than replacing concrete with timber after the design was complete. That distinction matters. Column spacing, floor systems, fire strategy, mechanical distribution, supply logistics and erection sequence all respond to the structural material. A direct swap can therefore punish the alternative system for decisions made around the baseline.

The published study examines construction cost, schedule, development finance and structural embodied carbon. Independent reporting on 7 May said the optimized mass-timber option carried an estimated first-cost premium of 8.39% over concrete. That is a meaningful gap, not a rounding error. It is also only one line in the development model.

Time is part of cost

Mass-timber components can be manufactured while foundations and site work proceed, then installed in a planned sequence. The study identifies a shorter structural and enclosure programme for the timber option. A shorter programme can reduce general conditions, equipment rental, site supervision and financing duration. Earlier completion may also bring rental income forward.

Those benefits are not automatic. They depend on design freeze, coordinated openings, reliable procurement and an erection plan that treats the digital model as production information. Late changes that are annoying in concrete can be expensive in prefabricated timber because panels may already be cut. Schedule value is earned through preparation.

This is why a percentage premium in the construction estimate cannot be read as the final difference in developer return. First cost, interest, start of revenue and risk allowances belong in the same comparison. A faster structure does not erase every premium, but it changes where the break-even point sits.

Carbon is another ledger

The report also compares structural embodied carbon. Timber typically begins with lower manufacturing emissions than reinforced concrete and temporarily stores biogenic carbon. Results still depend on boundaries, declared units, transport, adhesives, concrete mixes, end-of-life assumptions and the method used for biogenic carbon.

The useful lesson is not that every cubic metre of wood guarantees a low-carbon building. It is that material quantities must be extracted from comparable schemes and assessed with the same rules. A lighter timber structure may also change foundations and transport, while acoustic toppings, connectors and fire protection add materials that must not disappear from the model.

Risk does not vanish

The study identifies practical issues that can influence the timber option: early supplier involvement, market capacity, insurance, moisture management, fire engineering and coordination. None of these makes a 12-storey timber building impossible. They do mean that a team cannot price it accurately using only a generic rate per square metre.

Concrete has a familiar supply chain and established estimating habits. Timber can offer speed and precision, but it moves decisions earlier. That shift affects contracts as much as engineering. Who owns the fabrication model? When are openings frozen? How are changes approved after panel release? What temporary weather protection is included? The commercial answer can determine whether the theoretical schedule advantage survives.

How teams can use the comparison

At concept stage, teams can run a small set of disciplined alternatives rather than dozens of decorative options. Start with a common brief for net area, height, fire performance, acoustics and energy. Then allow each structural system to use a rational grid and floor assembly. Record quantities, construction activities and decisions that must be made early.

The next step is sensitivity testing. Change timber price, concrete price, interest rate, programme duration and contingency one at a time. This shows which assumptions genuinely control the outcome. If a result flips because of a one-week schedule change or a small supplier allowance, the team has found a risk to investigate, not a fact to advertise.

Finally, retain the rejected option and its assumptions. That audit trail makes later value engineering more honest and gives the completed project a baseline for checking whether estimated speed, waste and carbon were achieved.

What the headline does not mean

This is a feasibility study for a proposed building, not a completed-project account. The estimates are tied to a location, design, market moment and stated assumptions. The 8.39% figure should not be reused as a universal mass-timber premium. Another grid, height, procurement route, labour market or code strategy could produce a different answer.

It also does not prove that concrete is cheaper after every financial effect, or that timber is cheaper once speed is considered. The report instead supplies a transparent framework for testing those questions project by project.

The FrameVerk view

The biggest software opportunity is not a button that changes “concrete” to “wood.” It is an early comparison environment in which grids, spans, panel sizes, connection families, acoustic build-ups, fire layers, logistics and programme assumptions stay linked.

A useful concept model should show quantities and carbon alongside fabrication constraints. It should flag when a late shaft move affects several panels, when a transport limit changes panelization, or when a floor build-up erodes the structural depth saved elsewhere. Cost and schedule must update from the same design state.

Dartmouth’s study makes a strong case for comparative design before commitment. Timber did not win every row. That is precisely why the result is valuable: it replaces slogans with a model that can be challenged, refined and eventually compared with actual project data. The comparison exposes real trade-offs instead of hiding them behind a single average. This discipline is especially useful while early budgets still contain wide uncertainty.

Sources

• WoodWorks Atlantic, “Tall Wood Feasibility Study,” 2026: https://atlanticwoodworks.ca/tall-wood-feasibility-study/

• Canadian Wood Council, “Tall Wood Feasibility Study — Mass Timber and Concrete,” April 2026: https://cwc.ca/wp-content/uploads/2026/04/Apr2726_CWC_TallWoodFeasibilityStudy.pdf

• ConstructConnect Daily Commercial News, “Atlantic Canada’s first tall mass timber tower? Dartmouth study compares mass timber vs. concrete,” 7 May 2026: https://canada.constructconnect.com/dcn/news/projects/2026/05/atlantic-canadas-first-tall-mass-timber-tower-dartmouth-study-compares-mass-timber-vs-concrete