Two of the new developments are in Scotland – Braehead, near Glasgow and Houstoun Mains, near Livingston. In England Dobbies is proposing new outlets at Orton Grange, near Carlisle, and at Ashford in Kent.
Stagecraft was awarded the work after successfully helping Dobbies to develop its most eco-friendly garden centre to date at New Park, Lang Stracht, Aberdeen earlier this year.
Stagecraft said that over the years the Mid-Wales company has established a close relationship with Dobbies and on each project has "helped refine design ideas to help Dobbies develop a strong and sustainable brand".
Stagecraft will be responsible for fitting out the main plant and canopy areas, with work starting in November running through to the New Year. Materials will include Osmose pressured-treated timber from sustainably-managed and registered forests in the UK and mainland Europe.
In the plant area Stagecraft will supply nursery-bedding units, tiered-bedding units and basket rails. In the main plant area the design follows the Dobbies house-style of diamond green trellis panels and Osmose treated timber. In the canopy area the company will fit bedding, impulse and water feature displays, as well as fish-tank cladding. A new range of signage and compost holders will also be included.
Dobbies development manager David Clark said: "We have built up a strong relationship with Stagecraft over the years and value their contribution to the design and build process."
Stagecraft MD Tom Davis added: "Stagecraft is pleased to be involved at this important stage of the Dobbies garden centre expansion programme and with our wealth of experience in this sector of the market we will be able to offer new ideas and designs in conjunction with Dobbies design architects."