Sooraj
Ther is a related Thread whic may hel or may confuse in ’Contract Claims and claims assessment - Concurrent delays approaches’.
To assess your situation the first port of call is the contract. this will define when and how any "Entitlement" to Extension of Time is applicable and will also define when and how any pament of costs and proffit may become due to you.
Secondly consider the facts and map them out, good records are essential , without being too complex or going into excessive detail.
depending on the contract the parallel delay can give you entitlement to EOT due to employers default , but no costs due to your own parallel delay.
Another key thing in assessing parallel delay is the relative significance of the two delays and increasingly these days common sense and fairness come into play and [particularly in attributing costs] the relative merit of each delay is considered.
A trivial but technically correct paralllel delay used as an excuse to mask another delay is likely to be found out and debunked. If they are of equal merit you will probably get the EOT and relief from LAD’s on project end dates but costs may remain where they lie, i.e. each party has to bear their own costs.
Hope this helps.
Regards JK