Structural engineers are to check the stability of buildings which were damaged in a major fire at a recycling plant on the Leyland Trading Estate in Wellingborough.
Last week more than 60 firefighters were called to the blaze.
Northamptonshire Fire and Rescue Service monitored the site over the weekend and crews are still attending every four to six hours to conduct after fire inspections and to monitor the remaining hot spots and structure.
The area around the fire has now re-opened and experts say there is now a minimal risk for residents from the smoke and therefore the advice to close doors and windows and stay indoors has been relaxed
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Firefighters are at the scene