The simplest and cheapest way to build your own Faraday container is to use heavy duty aluminum foil.
Either wrap your house with R+HEATSHIELD or install ASTRO-TAB in your sidewalls to enhance the performance of mass insulation by reducing drafts, providing a thermal break and creating a more thorough building envelope.
If you don’t already have duplicates, make a list of what you want stored in your Faraday container and then look for them at garage and estate sales. If everything is bonded together electrically, and if you have several grounding points around the house that are true earth grounds.

So you can see that if your house was completely metalized except for the windows (let's say the window are 1-2 meters tall) it would appear that you would get blockage of the lower EMP frequencies (1MHz, or 300 meter wavelength), and that you would nearly be at risk of the higher frequencies (10-100+ MHz, or 30 meter to 3 meters wavelength) leaking through.
But if we consider from the microwave example that the hole size may need to be SEVERAL times smaller than the wavelength, you can see that a metalized house with un-meshed windows could be quite leaky to an EMP pulse. I think the conclusion here is that you would get some EMP protection from a metalized house with open windows, but I would not rely completely on that for protection of your valued electronics.
By the way, here is one poster who was thinking along the same lines as you about a Faraday house.

A few rolls of heavy duty aluminum foil, some cardboard boxes and a galvanized steel trash can are enough to create your own Faraday cage and protect your electronics from EMP. However, you can increase the the effectiveness of your Faraday protection by layering, or nesting them.

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