Slate roof maintenance!

[Account Closed]

Hey, my home has slate roofing. It has been five years since we have this multicoloured roof. Currently, our home maintenance works are going on. Actually, the slates don't need any maintenance though it has polished.I'd like to modify it into the single coloured roof. Like I've seen  beautiful single slate roof color on my friend's home. She referred the company, who did roof work to me. I loved it. It has an elegant look. But I didn't consult them in person because I have polished it already, though I don't mind changing the roof again. The current roof work was done by a nearby company. I'm getting married in February, so I wish to change the roof before that. I'm attaching a photograph of our home. Could you please suggest a single colour for our home? Is it possible to change slate roof alone? Or does it require the reworking of the entire home? If I need to rework on my home, I will be dropping this plan. So please let me know about this.I'd be grateful for your thoughts about this - especially if you are an existing and experienced offliner.

Happy 2019 all.