These bungalows have been suffering from structural movement for many years.  It appears that parts of No. 71 have been underpinned in the past.  Raking shores were provided to the gable wall of No. 73 more than 15 years ago.

The cause of the damage is primarily due to leakage from the drainage system

Although there are trees nearby these predate the age of bungalows and are not considered to be implicated in the damage evident. 

Tree removal would likely cause further damage.  

The properties have cracked and tilted.  The gable wall of No. 73 was deemed to be structurally unstable, hence the provision of the raking shores 15+ years ago.

Both properties are currently occupied.

The works to No. 71 can be undertaken while the tenant remains in residence.  The work to No. 73 will require the tenant to be temporarily decanted.

Undertaking the repairs and structural restraint will improve living conditions for the tenants.  Removal of the raking shores will obviate the fear of structural failure.