Is the proposed building immediately adjacent to your land or are you suggesting that he is building on your land? Is it just right up to the boundary?
Have you object into the application for planning permission?
Would this block 50% or more of your light into the rooms of your house? That is a lot of light to lose.
How old is your house and have you checked the deeds to see whether the right to light is excluded?
Would it affect your view?
If your house has only been built for 6 years then it is not yet acquired the right to light and hence, you have no claim if the neighbour blocks out your light. The light would have to be reduced by 50% before its actionable anyway. You would not acquire the right to light until the property had been built for at least 20 years.
Regardless, it is a consideration for the planning authorities if they believe that the property would be overbearing against yours, whether it blocks any light or not that is regardless of whether you have acquired the right to light or not.
It is the overbearing nature of the property which would be of concern for the planning authorities, and considering the effect upon your house, not the fact that it is built right up to the boundary. He is allowed to build right up to the boundary provided, and depending on the proximity of any buildings on your property, he serves you a Party Wall Act Notice.
Unfortunately, whilst properties can acquire the right to light there is no right to a view. There is case law on that.
It’s important that if this goes to a public meeting, you attend the meeting do not just send a letter in otherwise, the chairman of the committee can decide that it is not sufficiently important to you otherwise, you would have attended.
I’m assuming that you’ve already put your formal objection in the local planning authority. You may also want to use a planning consultant to put together your objection in the most objectionable way. You may find it money well spent.
Can I clarify anything for you?
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