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Two Roman blinds

Hi there, Roman blinds for master and kid bedroom. one in each room. Both windows are the same size: - measurements of inside window frames is 1880mm wide x 1300mm high. Then there are ~100mm architraves. Both windows already have Venetian blinds inside the frames. I’d like Roman blind to be mounted above frames and when blinds are raised to have minimal coverage of panes. Top of architraves is at 2m and we have a 2700 stud so there’s space. I’d like strings not a cord. I will provide only the fabric, which matches drapes in master. Please provide an estimate for this work. Thanks!