Blocking up part of the window. What needs to be filled in the new cavity

lokz

Hello All, 

Currently doing a integral garage conversion. 

Got this garage window blocked up to half last week. A new window will be fitted for the rest half. What needs to be filled in this cavity. This wall is the external wall of the house as this is the integral garage. (attached some pics)

I see a small sheet in between the two walls currently. Not sure what it is .

If it is a garage in-fill door, I understand that it will be sheet of cellotex. 

what does a  Building inspector inspects when he looks at blocking half of the window. 

Thanks. 

stuart45

You can use a cavity closer. Is a builder doing the job, or is it DIY?

lokz

stuart45 said:

You can use a cavity closer. Is a builder doing the job, or is it DIY?

Thanks. Should the new cavity be empty or should it fill it with anything. The brickie did the above job, I am getting the regular handyman to make it ready for it be fixed with a window by the window installer. So i need to let the handyman know exactly what needs to be done. 

stuart45

Have you had any plans drawn up?  Modern cavities are normally insulated.

lokz

stuart45 said:

Have you had any plans drawn up?  Modern cavities are normally insulated.

No Plans. Just building notice application.