The Council has a statutory duty to take into account the Local plan and any other material considerations, such as the EHDC Joint Core Strategy (JCS), as well as the NPPF.
These might include issues such as:
loss of light
overlooking / loss of privacy
parking / loading / turning issues
loss of trees
road access
proposals in the local plan
previous appeal decisions
local, strategic, regional and national planning policies.
What cannot be considered
matters controlled under building regulations or other non planning laws
private issues between neighbours
loss of value of property
problems with the construction period of any works
unproven health implications
You should not be concerned if yours is the only comment received. It is the points, particularly regarding material considerations, that are raised, rather than the number of comments, which are important in the Case Officer's assessment of the application and the final decision.