Offers on houses that clearly need work

Hello. Following a recent pay rise (yay), my partner and I have been able to up our budget to £290k. This is our absolute maximum.

I've recently seen a house on the market for £325k (based in england), and it's in a lovely area, is detached 3 bed with a decent sized plot (approx. 565 sqm). Now upon digging into the property itself, I've found out that it needs quite a bit of work doing to it and I've summarised the works:

• New heating system (currently has electric storage heaters that cost a fortune)
  • Gas connection is possible
• Full modernisation
• New windows (not all are double glazed)

Obviously the kicker is the new heating system which will be a big chunk of money depending on what heating system we go for.

Is it ridiculous to offer £50k under asking for this? This is just based on the worst case scenario costs including potential other issues with the house (re-wiring, roof issues etc.). It's a no-chain, so we believe it's probably that the person has passed away as it's clear an elderly person was living in the home- so we think it may have other maintenance needs to get it up to notch.

Another house a couple doors up was sold in Feb 2023 for £260k, and that was also a 3 bed detached, but didn't need any work doing to it. So we're even tempted to offer £250k?

Has anyone else had a similar scenario and can offer advise on what's too ridiculous?