Q. We have a turn-of-the-(last)-century front-porch colonial. It needs substantial modernization, and I've found that problems that seem unrelated in fact do contribute to one another, leading to bigger costs than expected. For example, we need a new boiler, new wiring, a rebuilt chimney and insulation in the walls. Further, the house has a lead water main and a sewer line that has been penetrated by tree roots. The boiler connects to the chimney, which has never been lined and doesn’t have a rain cap. To replace the boiler, we have to line the chimney with a liner that fits the new boiler, and we have to rebuild at least part of the chimney above the roof. more