This is a job I've been working on in the evenings and weekends for the last month or so. I've changed most of the doors in the house and the two front doors.
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 It's amazing the difference changing the front door and painting the windows has made to the front of the house. Certainly improved it's curl appeal!
I changed most of the internal doors for oak as well, and I made a couple on site for the cupboard under the stairs. Architrave and skirtings were also changed for oak in places as well. I treated them all with a coat of Osmo oil before leaving them. 
Hopefully all this work will make the house more appealing to potential customers.