Hi Jessica
Many thanks for your message.
As our blinds are made to measure, they are non-returnable/non-refundable however we do offer an insurance which can be purchased at checkout called MeasureSafe – please find the information here – https://www.blindsbypost.co.uk/measuresafe
I have also linked the video measuring guide for our perfect fit blinds here, and if you have any specific questions just let us know, we’ll be happy to help – https://vimeo.com/452546762
Thanks
Emma