Budget reality in Lanark is shaped by its size: there are no airport transfer costs, no city-centre hotel surcharges, and the headline heritage anchor (New Lanark) is a short bus ride or walk rather than a pricey tour. Accommodation runs almost entirely through independently run B&Bs, guest houses and self-catering cottages, which keeps nightly rates lower than Glasgow or Edinburgh for similar comfort. Eating is pub- and café-led rather than fine-dining driven, and the surrounding South Lanarkshire farmland keeps grocery prices modest.
The main budget levers are timing (May and October shoulder weeks sit between the May–October sweet spot the climate rewards), how you reach the town (ScotRail from Glasgow Central is the cheapest and most reliable approach), and how you split paid entries (New Lanark, Lanark Museum) against free anchors (Lanark Loch, St Nicholas Churchyard, Castle House gardens).