You're getting sucked into the usual mantra that property "experts" spout.
That house prices only go up, you can't go wrong with bricks and mortar, that they are not building any more land.
Whether house prices increase or not depends on a lot. The area, what is in it and what is happening around it. The type of house. The conditions that may be imposed on ownership.
In my area there are newbuild flats that are not selling over the price they were sold at new in 2005. This is because 2005 was near peak market, but also they have onerous service charges, which people have become a lot more aware of in recent years. This has severely impacted their selling price.
There are others in the same area that increase less in price because of their flood status, they are in flood zone 2. Over the last 20 years people have become a lot more aware of checking for stuff like this, so the value is impacted.
There are others that are in "undesirable" more modern formats. Houses that are in these formats tend to increase less in price than those in traditional ones.
Finally there are those that do increase in price pretty well. These tend to be of traditional design, detached and on large plots. Still although these houses have increased in price, they haven't kept pace with inflation.
This is just one micro market in one area of the country.