Firstly, you need to establish the amount of gas supply you’re going to need. Don’t worry, this can be handled by your heating engineer. They’ll examine your building plans in detail, estimating what is required for a house of that size and accounting for appliances like hobs and boilers. They will measure the gas needed in kilowatt hours (kWh).
60kW is usually the maximum capacity for a metre to be considered domestic. Anymore than that and the consumption may be classed as commercial, increasing costs and reducing the number of available engineers. This is unlikely to be a problem for you unless you have a particularly large house with additional amenities to heat, like a pool and/or guest cottage. If that’s the case, then you’ll need to get a bespoke quote.
The distances between your planned metre location, highway boundary and the nearest gas main will also be necessary for the application. For standard installations, the maximum distance allowed is 40m on private land and 23m on public thoroughfares . If your connection exceeds this, you’ll need to ask for a bespoke price.
If your access to the gas main will have to cross land owned by someone else, then you’ll need an easement: written permission from the owner of that land.