OP
Dave 85
Don't a lot of the travelling community do that though? Which would make the homeowner more suspicious. At least a letter outlays your business and what it can do for them in a non confrontational way. Although most folk will already have people they want to tender for the job anyway.
Im pretty sure the 'travelling community' lets call them 'gyppos' for arguments sake, come along, spread a thin layer of tarmac over your drive while you're at work and then come round later saying you owe them 5 grand and they've no qualms about hanging you up from the nearest tree if you'd like to negotiate on the bill.