For instance if your copper pipes were put in to replace leaking pipes, that would likely be considered maintenance. If your copper pipes were put in immediately before selling the house, that could possibly be considered an improvement.
IRS Publication 523 can give you ideas about what to look for:
The costs of selling the home are generally deductible from the gross sales price. Talk to a tax consultant to understand what is deductible and what records you need to have.
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Is the property your primary residence? If it is and you have live there 2 years out of the last five years then you might qualify for a $250,000 profit exclusion. If you are married, that exclusion can be up to $500,000 ($250,000 each). You are disqualified from the exclusion if you took the mentioned profit exclusion within the last 2 years.
A couple other things to think about:
Does the property to qualify as your primary?
* it has to be near your place of employment
* address is used for tax returns
* close to services you used
Did you depreciate the property in anyway?
ie... home office use
As stated we aren't tax experts, I just help a client so of this stuff is fresh in my brain. Consulting with a tax adviser will help. Your taxes might be easy or real difficult. In addition to the profit (if any) you are making, you have to consider your income, your investments, etc.
In short, you need to talk to your CPA about your tax implication of your sale.
We the realtors can not give tax advice, in addition to the information below, here is a link to IRS site with further details on sale of your home (tax implications).
One of California's general rules have been if you lived in the house for 2 of the previous 5 years as your own home then each spouse would have a $250,000 break.
You Paid $650,000 from $735,000 sale the difference is less than $250,000 the Escrow Holder would not be required to with hold taxes at the time of sale if you lived in the house as your primary home.
As for other tax deductions, etc, that is up to your Tax Advisor.
Have an amazing day!