I thought I'd chime in here, as there are a couple of other things you might want to take into account for your maternity/parental leave. I have two young children (4.5, 2.5), and took a year off with each of them (in Manitoba). I too am the breadwinner. I'll let other people speak to your reno situation :) I apologize in advance, as this is likely to be a bit long.
Taxes - when you go on leave, keep a close eye on how much tax is being deducted from your cheques. You do have to pay tax on EI income (seems not everyone is aware of this), and between myself and my "mommy" friends, we've seen deductions that range from 4.5-10%, with no rhyme or reason as to the difference. Just be aware that they likely will not deduct enough, and you may end up owing at tax time. My strategy was to continue contributing to an RRSP while I was on leave and use that to offset the taxes owing. I know of several of my co-workers who have been dinged with tax bills into the thousands of dollars because of this, so be aware!
Canada Child Benefit - you will start receiving the Canada Child Benefit once your baby arrives. It is net income-based, and the cycle runs July-June (much like the GST credit). CRA has a calculator here:
http://www.cra-arc.gc.ca/bnfts/ccb/clcltyrccb-eng.html. It is non-taxable, and is paid monthly.
RESPs - If you are not already aware, it is possible to catch up on previous years of RESP contributions. So don't feel the need to stretch yourself thin to start making RESP contributions straight away (
http://www.canadiancapitalist.com/quick-tip-catch-up-on-resp-contributions/). That being said, we have found the easiest way to max out the RESP every year is to just toss our Canada Child Benefit amount into the RESP every month. Why not use the government's own money to get that 20% grant? This assumes that you don't need to save the Canada Child Benefit to pay for day care costs. I know that those are significantly higher in Ontario :(
RRSPs - assuming that you are contributing regularly, look into carrying forward your RRSP deductions for the next several years. It sounds like you will be in a similar situation to mine, where I had 4 years of reduced income due to my leaves crossing tax years (Aug 2012- Aug 2013, Sep 2014-Aug 2015). I knew that my first full tax year (2016) would have a much higher income than those 4 years, so I have carried forward my deductions for those years (less what was needed to offset taxes while on leave). We will receive a very tidy return this year, and will also substantially reduce our net family income, which will boost our Canada Child Benefit amount for the next annual cycle.
I am by no means a tax expert, but these are things that I have learned so far and hope that others can benefit from.
As for baby stuff - check out consignment shops (we have a couple of Once Upon a Child franchises here). Babies go through clothing so quickly, it's barely worn at all, and even now we buy all of our shoes, rubber boots, and most clothing at those stores. We've been lucky to receive a lot of hand-me-downs, but we're getting to the ages where kids start wearing stuff out, so we're having to buy more. You could also consider cloth diapering (there are arguments about whether it costs less, but I sewed a bunch of the inserts we use, so for us it did).
One other thing to look into - can you change the type of car insurance coverage you have while you're off? My experience is all with Manitoba Public Insurance, so I'm not sure if this is relevant, but I was able to change my coverage type to "pleasure" rather than "regular" while I was off. It saved us about $30 a month, and covered everything normal insurance covered, except that you can only drive to work 4 times per month.