Residential Gas Line Sizing

I'm looking for a professional to size a gas line for my residence. The gas line will be used to connect a furnace/heater, water heater, kitchen stove/oven, and a generator. The gas type is natural gas.

Ideal Skills:
- Expertise in gas line sizing
- Familiarity with residential gas line standards
- Knowledge about natural gas specifications
- Experience with gas line installation for multiple appliances

Please provide your bid if you have the relevant experience and can deliver quality work.