If you are trying to manage as much of your build as possible you will also be wanting to save as many pennies and pounds as possible.
One way to save is through your materials. Don't let your builder, for example, add the materials to their quote, they will also be adding their own percentage of profit on top of the actual material costs. Go direct to builders merchants and suppliers armed with quantities and a programme. Get quotes and then ask for discounts, especially if you can bulk order different materials. The supplier wants your business and should be willing to do all they can to get you to order.
If you can go direct to the supplier, ask questions and find out prices. Even if they wont supply directly to you, you will be armed with vital information to ensure you get the best possible price from their agents.
Remember to ask about delivery costs and times, you may not know exactly what you will need but you may now when you will want it delivered. Book a delivery slot as soon as possible and confirm your order at a later date.
YourBuildPlans supply a building plans service to Builders and Building Companies across the UK.