Growing chicks need more space

Five weeks old now and Chirpy is still growing fast. He is nearly fully feathered and his wattles are starting to develop. The following photo shows him perching on the side of the brooder (one of his favourite activities)!

Chirpy will soon need larger accommodation, and I've been building him a large indoor chicken run in the greenhouse. It measures 2.4m x 0.5m and will have an infrared lamp hanging above it to provide warmth and light during the day, and an electric heater to provide warmth during the night. So far I've made the basic structure out of OSB and used some wire panels (which were originally part of a potato sorting machine) to cover the top. Part of the top has a solid OSB cover to provide somewhere for the chicks to go at night, and this is where the electric heater will be installed (see photo below).

Hopefully the indoor run will be big enough for Chirpy and the other three chicks that are in the brooder at the moment, although the other three are probably still to young to go out into the run. The other three chicks are also doing well and are now almost three weeks old. The following photo shows them all together. Sooty is in the middle, Sweep on the left and Blondie on the right.

Sweep's legs have taken on a grey colour, and he is the largest of the three and has the most advanced feathering. Sooty is smaller but perhaps the most aggressive of the three. Blondie is finally growing some tail feathers and is definitely the most timid, and does not like to be separated from the others. They are all doing really well and my hope is to put them in the indoor chicken run with Chirpy in due course, but at the moment Chirpy is about double the size of Sweep, even though he is only two weeks older, and I don't want Chirpy to bully the smaller chicks.

I've checked the eggs in the incubator and the good news is that 5 of the 7 eggs are fertile and developing well. They are due to hatch on Wednesday, which is only 3 days away, so I'll need to get Chirpy moved out into the chicken run before the new chicks hatch.