Should You Voluntarily Upgrade a Building for Earthquakes?

A voluntary seismic upgrade is an owner-initiated retrofit designed to a chosen performance target — typically evaluated under ASCE 41. It addresses the building's specific seismic deficiencies with measures like new braced frames, shear walls, diaphragm strengthening, and wall anchorage, scoped to the owner's risk tolerance rather than a code mandate. The freedom to choose the target is the voluntary upgrade's great advantage. Code-mandated retrofits aim at prescribed minimums; voluntary retrofits can aim at whatever the owner actually wants — from preventing collapse to keeping the doors open the day after the earthquake.

Seismic evaluation comes first, and it's a distinct engineering product: the ASCE 41 evaluation identifies deficiencies systematically — weak stories, diaphragm discontinuities, unanchored walls, non-ductile detailing — and ranks them by their contribution to collapse risk. The evaluation report is the owner's decision document: it says what's wrong, how bad it is, and what fixing it would achieve. Performance-target selection comes second, and it's a conversation, not a calculation. Life safety means occupants get out alive but the building may be a total loss; immediate occupancy means the building stays usable. Most voluntary upgrades I design target something between — damage control that protects both people and the owner's investment. The target drives the retrofit scope and the cost, so it's set deliberately with full information. Retrofit design comes third: the specific measures, sequenced for a building that usually stays occupied. Phasing a seismic retrofit through an operating building — adding braced frames one bay at a time, strengthening diaphragms floor by floor — is a design constraint I build into the documents from the start.

Evaluate first, choose the target deliberately, then design. The performance target is a business decision informed by engineering.

• Commission an ASCE 41 seismic evaluation: deficiencies ranked by collapse-risk contribution
• Select the performance target with the owner: life safety, damage control, or immediate occupancy
• Design the retrofit measures to the target: frames, walls, diaphragms, anchorage, nonstructural bracing
• Confirm jurisdictional consequences: whether the voluntary work triggers other code upgrades
• Phase the work for occupied-building construction and document it for insurance and financing