Solid kitchen & heating

Should heating be on in new house before fitting a solid kitchen? House is plastered with 14 months.

95% of kitchen carcasses now are chipboard. If you mean solid doors then as long as the house is weatherproof for the past 14 months there should be no problem. Might be an idea, once fitted, to take off larger doors and doors in vunerable areas, near doorways until house is finished.

Fitting any solid wood material into a house , whether its room dooors, solid kitchen, or furniture , needs to be done with care.
Regardless of how long a house is built , thats not the real issue here. The one thing that will do irrepairable damage to solid wood is suddenly changing its environment from mayeb, an unheated workshop to , a full blown centrally heated house , with a high heat level in a kitchen.

Best practice is to bring up the heat level at a slowly increasing rate over a period of days, maybe a week or two if possible, especially if your kitchen has large solid panels in the doors. Solid wood in a functioning kitchen will achieve a moisture content of between 6-10%.

You would be lucky to have new kitchen doors delivered to you that are below 10% depending on the storage methods used prior to delivery.
They take time to settle down to a new environment heat wise. So be careful.

sabre