If the Adjoining Owner consents within 14 DAYS to the building of a new wall astride the boundary line, the work (as agreed) may go ahead. The expense of building the wall should be shared between the owners in proportion to the use of that wall made or to be made by each owner.
The consent must be by a notice IN WRITING. It is strongly advisable that it should record details of the location of the wall, the allocation of costs and any other agreed terms.
If the Adjoining Owner does not consent IN WRITING within 14 days to the proposed new party wall astride the boundary line, you will be obliged to build the wall wholly on your own land, and wholly at your own expense. You will have to compensate any Adjoining Owner for any damage to his property caused by the building of the wall, or the placing of footings and foundations under his land. There is no right to place “special foundations” under his land without his written consent.
You may start work one month after your notice was served, or earlier by agreement.