The most expensive thing about a house isn't the design — it's the lack of one: changes made on site cost several times what the same decisions cost on paper. The architect starts from the planning certificate, which states exactly what can be built on the plot — height regime, site coverage, floor area ratio, setbacks — then proposes a solution and, once approved, coordinates the structural and services disciplines into a single coherent set of documents. The detailed design, with construction details and bills of quantities, is what lets you obtain comparable quotes from builders. On SmallJobs you can request offers from architects and design practices for houses, extensions, loft conversions, fit-outs, or permit documentation.
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