Tiddle it's a tricky one. This is where advice from people in your own country would be more helpful. What you need to look at is what if you and your partner lost your jobs, what would happen? Would you be entitled to social benefits such as unemployment? What would it cover and for how long? Would you be penalised if you were holding cash? That is how I would approach it. I would really discourage you from taking on any debt at all, especially for cosmetic updates. If the economy contracts (and it will) cash will be King and you may find you can get a great deal on a bathroom suite in 6 months. I would definitely aggressively shop around for materials such as carpeting. You may even find suppliers willing to let you pay over a few months with 0% interest. This is because they could have stock that they are not moving and need to shift.
If you haven't talked to suppliers and visited show rooms recently (noone has) you may find the situation has changed quite dramatically in the last 8 weeks and they are willing to work with you and give you some very good deals. This is how I would approach it. If you haven't picked out what you like first try and narrow down your choices i.e. look at Pinterest and save some photos of the look you want and the bathroom suite. Send those to local suppliers and ask them how much "something similar" would cost in a range of prices, high end version, versus a more "competitively priced" version. Ask them how much it would be with and without being fitted. Create an excel spreadsheet and make sure you are comparing like with like i.e. exactly the same suite at different locations. You can spend lots of time on research as I assume noone can come into your home any time soon. See if they have what they call here in the USA "closeouts" when they are phasing out or discontinuing a range of products and are if they can give you a deal, or a shop floor model (I imagine it's pretty hard to damage a loo that's been on display). I got a beautiful new side table recently that had been on display for 60% off. Of course it was not damaged. You have to check everything very carefully because usually those products can't be returned but you can save a ton of money. Be creative when negotiating, tell the salespeople you are looking for a really "competitive price". I used to sell and we were trained never to call anything "cheap" 
When we moved in here in 2017 we painted the entire interior, got new carpet throughout, refinished the woods floors and got new lighting, mirrors and furniture. DH also took out a God-awful 7 ft high red brick 80s fireplace and put in dry wall and a built in cupboard in its place in the family room. We got some great (light colored) carpet which I absolutely love which deflects all dirt from kids and pets and is super soft. It is lovely to walk on with bare feet. We recently got a puppy and we have been able to get every stain out no problem. This was on the pricier side but was a great investment. At the carpet showrooms they had areas with huge offcuts, big enough to carpet a room. I would establish what you are looking for and again talk to the salespeople, ask if they have any large remnants that would be suitable (obviously measure your rooms before hand) and ask the price with and without fitting. You may find places willing to fit the carpet free and give you a discount right now. I would call every store within a pretty generous radius from you. Also if you know exactly what you want you can shop online and see if you can find that product at a better price. Send away for samples of carpet so you can check the quality and colour. If you already know some trustworthy local subcontractors (bath room fitters, carpet fitters) see if they are willing to give you a quote because they may have access to wholesale prices. Just always make sure you are comparing like with like so you don't get ripped off with a low quality product. We built a house and found a beautiful range with six burners that looked almost identical to fancy appliances such as Wolf for significantly less. I think DH found it at a catering supply store. Do all your due diligence before making the final decision. If you find something you like and prices are good between two suppliers, go back and negotiate, ask them if they can give you a better deal if you pay cash.
You probably have a very good chance of saving a lot of money at this time without taking on debt. DH and I always pay as we go for everything, including cars. We drove an old banger for years until we could pay cash for a better car, as cars depreciate it makes no sense borrowing to own them.