John Lewis is planning to expand its offering from furnishing homes to extending and renovating them.
The employee-owned business said it wanted to be involved in every area of home improvement from design to construction.
John Lewis already runs a booking site for tradespeople and last year it acquired a home improvement firm, Opun.
But now it is planning on bringing both of those services under one roof to design and build extensions.
Opun designs and installs bathrooms and kitchens as well as undertaking loft conversions and extensions.
Since it was acquired by John Lewis in September 2018, Opun, which undertakes large-scale construction projects, has been operating independently but now it will work alongside Home Solutions, which finds tradespeople for smaller jobs.