Buying a house is the biggest expense you're ever likely to have - with the mortgage that comes with it the largest debt you'll likely to ever be in.
Which means even a small effect from Britain leaving the European Union could cost or save you thousands and thousands of pounds.
And now - with a deal likely to pass at the end of the month people are questioning whether now is the right time to buy.
The good news is that Martin Lewis has just given advice on whether you should wait to see what happens or take the plunge now.
Speaking to an audience member on the Martin Lewis Money Show, he said the key was to look to yourself, not the trade negotiations.
"When we leave, nothing changes. We are in a transitional deal with the EU until the end of the year," Martin explained.
"So what's going to affect this is the sentiment of what's going to happen in the deal," Martin said - as in the perception of whether we have a good one or a bad one.
That means, if you're in a position to move now, Brexit shouldn't be the main focus.
"In the next 6 months nothing much is going to change - so focus on the internal rather than external economics," Martin said.
