Direct Answer
Evaluate a detailing firm by reviewing sample shop drawing packages from recent comparable projects, calling fabricator references (not GC or engineer references), assessing their RFI process and response time, and — ideally — running a small pilot scope before committing a major project. The most telling indicators are: drawing accuracy (revision rounds per project) and RFI turnaround time.
Full Explanation
Quality evaluation framework: (1) Sample drawings — request 2–3 complete shop drawing packages from recent projects. Evaluate: clarity of dimensions, view selection, title block completeness, weld symbol accuracy, and BOM organization. (2) References — ask fabricators 'How many revision rounds were needed to reach IFC? How many RFIs were generated? Were there field fit-up problems traceable to detailing errors?' (3) RFI responsiveness — send a test RFI during the proposal phase and measure response time and quality. (4) Software — confirm Tekla or SDS/2 proficiency, DSTV output capability, and IFC export. (5) Communication — assess project manager availability and communication style.
What This Means for Your Shop
A detailing firm that took 4 revision rounds to reach IFC on a previous project of similar complexity will likely take 3–5 rounds on yours. Ask directly: 'What is your average number of revision rounds per project?' A firm that can't answer or deflects is a red flag.
Common Mistakes
Using engineer or GC references for detailing quality evaluation. Engineers evaluate detailing differently than fabricators — they focus on code compliance, while fabricators focus on shop-floor usability, BOM accuracy, and DSTV quality.
Recommended Process
Develop a standard reference check questionnaire for detailing evaluation: 10 questions covering revision rounds, RFI volume, fit-up problems, BOM accuracy, and overall recommendation. Call at least 3 fabricator references for any detailing firm you're considering for a major project.