The most common surprise on a North Tustin job is the framing itself. Houses from the mid-1960s were built to a different tolerance than anything going up today, and an opening that measures square on paper sometimes isn't once we get a level on it. That can add jamb work to a job we quoted as a straight door swap.
The other one is lead time. If a homeowner wants a width or finish outside our common stock - which happens more here given the higher share of custom and insulated door requests - that door comes from the manufacturer, not off our truck, and we won't promise a same-week install on something we don't have.
We'll also tell you plainly when a repair beats a replacement. If the door itself is sound and only the spring or a section of track failed, replacing the whole unit is money spent for no real gain, even if a new install is the easier sale.