Whether you want to find the architectural drawings of your own home or another building, you should be able to find them somewhere if you are prepared to put in a little time and effort. There are copies of drawings for buildings around the world kept in various places, and these are freely available if you know where to look. If you are based in Preston or Blackburn and are looking to have some architectural drawings created for your project (perhaps to build your dream home or to make a start on another type of building), you can contact David Haworth Design, where a professional architect can make a start on your drawings for you.
For pre-existing drawings, though, here are some of the places that you can look.
You need to be prepared to put in the time, but it is more than likely that you will be able to find the drawings you are looking for on the internet. Try online databases that hold onto these kinds of plans, such as the Avery Index to Architectural Periodical, which is the most comprehensive database online, covering over 700 sources. You could also try simply using a search engine, if you are prepared to put in a little more time.
Contact your local council
Often, local councils will keep blueprints of buildings that are part of their borough. You may not be able to get the plans for every building, but it is always worth asking in order to find out if they are on record. You should then be able to either borrow them or have a copy sent out to you for a small fee.
Ask the builder or architect
Anyone involved with the design and construction of the building should have a copy of the architectural drawings for their records. Not everyone will have a copy, but if you can find out who was involved in the various stages of building, you should be able to track down a copy of the plans.