My dad was a house builder back in the 50s build war service homes in my local area, a work crew of 4 builders, all hardwood houses built on stumps, only had hand tools, hammer, nails and a bar of soap, hand saws, string lines, a level, an angle/square gauge and of course the builder pencil as well a sharp knife.
Builder today have it so easy, nail guns, building with soft woods and mostly build on concrete slabs, frames and roof trusses arrive on trucks already made from a factory.
My Father and both older brothers were all Engineers. My Dad was a Mechanical Engineer, also licensed as a Civil Engineer and Surveyor; he designed and developed several residential home subdivisions, then started a residential home building business with my 2 ex-brothers-in-law running it (they weren't "ex" at the time). It became the fastest growing residential home builder in the USA for several years, and Laredo, Tx competed with Las Vegas, NV for "Fastest-Growing US City" for several years in the 70s and 80s on the strength of that buisness.
My oldest brother is licensed across all 4 states on the West Coast (and still licensed in Texas), in Electrical, Mechanical, Civil and Fire Protection engineering, as well as licensed surveyor; he's a senior partner in a very large Engineering concern, based in Oregon.
My next older brother is licensed in Mechanical, Electrical, Structural, and Architectural Engineer, and also a licensed Surveyor. He had the wrath of every engineer in the USA when he LEGALLY designed a local public elementary school, WITHOUT a licensed Architects seal on the construction plans (I did the bulk of the work on the mechanical, electrical & plumbing sections, working under his LEGAL oversight for nearly ten years). Architects across the country sent money to lawyers in Texas to try to "steamroll" him into paying an Architect to seal the plans, and he flatly refused. The Attorney General of Texas ruled in my brother's favor; because deep within the law, there is a tiny clause that uses the words "...plans will be certified by a Registered Architect OR Architectural Engineer, currently licensed to practice in the State of Texas". After that, my Father and brother got VERY LITTLE business from the local architects. My Dad retired, my oldest brother moved to Oregon, and my next older brother started writing books and rabble-rousing. By that time, I had started restoring classic bikes, so I no longer worked for them doing AutoCAD design and maintaining the computers, copiers & printer/plotters.
Oh, yes, that school we designed was the FIRST ONE to come in UNDER budget, and AHEAD of schedule, in the history of that school district (over 50 years). All of the teachers called it "the best school they ever worked in" because of the layout and systems.