Whilst the party wall act certainly will not apply they may be able to gain access under the 'Access to neighbouring land act'.
Effectively the PWA has this access allowance built in but where it does not apply (as here) then the access act allows the neighbours to present the case at the county court and have access court ordered. Under this route it is likely that (if granted) rights of access gor future maintenance will also be pre approved and written into the title deeds. The idea being to keep this matter out of court in future.
You should note that if the neighbour can demonstrate that his deeds already grant him this right then you must allow him access.
Now, the access act only normally applies to certain works. These cover maintenance of the property but not new developments. I would not consider adding windows ti be 'maintenance'.
However if they remove the windows and then add new ones from their own side then they could claim access to maintain those windows (ie complete the works by sealing them).
As for the external insulation this may or may not be considered applicable work under the access act (unfortunately im not very experienced with this act to advise regarding case law).
One thing to note is that the access act allows the courts to order the neighbour to pay reasonable compensation where it can be demonstrated that granting the access will cause unreasonable inconvenience and the neighbour will gain a financial benefit. Installing insulation would certainly do this as it would lower energy bills, whilst adding windows may add property value.
Of course, the courts may equally say that access would not cause any inconvenience!?
You really do need to seek proper legal advice for this.
Until then just remember that if they access land without permission they are trespassing.
Effectively the PWA has this access allowance built in but where it does not apply (as here) then the access act allows the neighbours to present the case at the county court and have access court ordered. Under this route it is likely that (if granted) rights of access gor future maintenance will also be pre approved and written into the title deeds. The idea being to keep this matter out of court in future.
You should note that if the neighbour can demonstrate that his deeds already grant him this right then you must allow him access.
Now, the access act only normally applies to certain works. These cover maintenance of the property but not new developments. I would not consider adding windows ti be 'maintenance'.
However if they remove the windows and then add new ones from their own side then they could claim access to maintain those windows (ie complete the works by sealing them).
As for the external insulation this may or may not be considered applicable work under the access act (unfortunately im not very experienced with this act to advise regarding case law).
One thing to note is that the access act allows the courts to order the neighbour to pay reasonable compensation where it can be demonstrated that granting the access will cause unreasonable inconvenience and the neighbour will gain a financial benefit. Installing insulation would certainly do this as it would lower energy bills, whilst adding windows may add property value.
Of course, the courts may equally say that access would not cause any inconvenience!?
You really do need to seek proper legal advice for this.
Until then just remember that if they access land without permission they are trespassing.