Carpentry framing is an extremely involved skill that requires someone who has a lot of experience. The frame of a home or new room is perhaps the most important part of the whole build. If the frame is off by too much, then the whole room can be off-kilter or be structurally weak. Even worse, a whole house that is improperly framed is extremely dangerous. Aside from the dangerous aspects of an improperly framed house, repairs to the frame can be very costly as they are often not found until after other work has been done over the frame. Look for carpenters who use eco-friendly building practices like sourcing their wood from sustainable forests. There are a number of benefits to sourcing your framing materials this way. The biggest benefit is that these forests are heavily managed and any timber coming from them is accounted for. This higher degree of oversight means you're less likely to get substandard wood for your framing job. In some cases, it also means that you'll be able to get a rebate for using eco-friendly building practices. Of course, the potential for this will vary from location to location.