Future proof kids bedroom

[verytiredrightnow]

Hi, DS 8 has been sharing his bedroom with his younger sibling but we've decided to move him into his own room. Room measures 3.4x3.4m and is a complete blank canvas. Budget for furnishing and decorating is medium, we can't stretch to anything fitted or made by a carpenter but we want stuff that will last as he'll be in this room til he's 18+. IKEA is fine but what other shops are good in that price range?
Looking for recommendations for shops and storage solution ideas. Want lots of storage e.g. under bed, wardrobe, shelving. I've only ever kitted out a nursery before so I need to keep reminding myself that he'll be in this bedroom until he's a fully grown man!
It just occurred to me that he will need a desk. Is there anything else that parents of older children/teens can suggest?

Bunk bed with desk underneath?

We're moving DS into a new room in the summer and I'm going to paint the walls white and then add colour through new duvet cover, curtains and decals on the walls. All that can be changed fairly easily and for low cost so can change as he gets older.

Then he'll have bed with storage underneath, chest of drawers, small wardrobe (maybe just a single-width one as not much to hang up) and some kallax that he already has downstairs for his toys.

My DC are late teens and have retained the following from when their rooms where decorated about 12 years ago:
Colour on walls (pale blue grey)
Ikea cube shelving
Hard wood flooring
Desks.
Things I would do differently: Either buy double beds straight away, or spend much less on single beds.
Buy cheaper curtains and rugs.

Don’t get a mid-sleeper if you want it to last until adulthood. Consider a small double or a long Euro single.

Yes I agree he's not going to want to sleep on a mid sleeper as an adult!

I originally got my son a single bed, but have swapped it out for a small double instead as he's tall & it gives him a little extra room to grow.
I did bother finding small double sheets at first, but I use double bedding for the duvet & I would just use a regular double sheet if I needed to get more & tuck it in a bit more so it would fit.
Have pull out drawers on wheels under the bed which got used for flinging Lego & small bits in but that can change over time.

I stripped the floorboards & painted them white, walls & woodwork are white, furniture is mostly white (but he has a 6ft wooden bookcase that looks like an upended boat that's a sort of whitewashed beige colour) & it makes it really easy to really change the look of the room just by getting a new rug/curtains/lightshade/bedding.

He does have a desk & desk chair (white) which get a lot of use even though we have a no computers in bedrooms rule as he's only about 13.

I got bedside tables that have a drawer & a door so he has somewhere 'private' to store bits.

I got some water hyacinth bits like a waste paper bin, laundry bin, door stop.
When he was smaller the laundry bin was full of plushies, currently it's storing Nerf stuff & a lightsabre.
One day it will be a laundry bin for the first time.

He's mostly stayed with a few blue or blue/white & some pale brown faux fur stuff (cushion on chair & blanket on the end of the bed) additions for the past few years.

I put up a quirky mirror on the wall which has been a hit with every boy who sees it - they all just seem to like there being a mirror.

He objected to anything 'babyish' like applique boats on his duvet covers a couple of years back, so that stuff went but the room is basically the same.

The art has changed over the years as his tastes have changed & it makes the rest look rather different even though it isn't.
When younger he had those wooden frames you can slot different pictures in easily up on the walls.
They've gone as apparently they are 'babyish' now & he puts less of his own artwork up.

Make sure you have enough sockets in the room - I had to add a couple more double sockets.

It's bright, easy to clean (robot hoover does a great job on low pile rugs or floorboards) fairly minimal when you see it & he seems comfortable in there.

Thanks. Ha i'd never heard of water hyacinth! Had a google and I like it.

Another vote from me for a long single (sometimes called EU single, 90x200cm) if you don’t want to lose floor space to a double. They are long enough for a 6’+ adult to sleep in pretty comfortably. When we redid DD’s bedroom last year we got long single Stompa bunks. Once she’s too old for a bunk bed they will split into two long single beds. Ikea also do a good range as well as selling inexpensive fitted sheets.