Covering Brick Walls in Conservatory

Gambler

Our conservatory is approx 11 x 11 with aprox 3 feet dwarf walls on 3 sides and bricks surrounding the patio doors.

It is red brick and we just want to cover the red brick colour. Our initial idea and cheapest option is to paint with masonry paint.

Is another option to have sombody plaster/render the brick so we can then paint normally. Any idea how much roughly this would cost?

Anybody tried either option?

Thanks