How much do conservatories and loft conversions add to the value of a property?

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Seen a really nice house that has had a conservatory added and a loft converted to form a bigger master bedroom. Hasn't added an additional bedroom to the property though as a smaller bedroom has been cut through to provide access (the smaller bedroom is now a dressing room).

If the value of the house without these works is c £450k, how much do you think these extensions would add to the value?

Is the conservatory done well? Is it like a part of the house, or a cold shut-off storage area? I think it is hard to say without knowing the area / market / housing stock. At the end of the day the value is however much someone is willing to pay for it. A bigger bedroom wouldn't add too much value for me, a dressing room would be wasted on me as well. If the conservatory adds extra living space that you can actually use, that would add quite a bit for me. Some people hate them though and would consider them a problem with the house rather than an asset.

I think it all depends on how it has been done. I would hope that the ratio of 1/2 bathroom to 1 bedroom has been kept.

Lofts and conservatories are usually harder to keep warm/cool and can add ££££ to utility bills and especially conservatories can be unusable for 3 months of the year.

average conservatory 10k

bedroom maybe another 20k if it's been changed from a single to a large double. Does it have an en suite? That would add more. I guess the dressing room is now considered 'extra space'.

The conservatory is part of the house and is open plan to the kitchen/dining area. I would have preferred a garden room tbh but the conservatory is quite nice and in keeping with the rest of the house. In the long term I might look to replace with a garden room.

Without the loft conversion, the original master bedroom (which is elsewhere in the house) is quite small so wouldn't fit a dressing table for example - which is a must for me. So the revised layout means you have a large master with a separate dressing area for dressing table and chest of drawers etc and then access to the en-suite. The only issue I have with the loft conversion is that there is only one window which isn't enough IMO. I would want to add an additional window in the long term.

less than they cost.

A bigger house is always worth more than a small one with bits tacked on.

Verify the Planning Permission and Building Regulations approvals with great care. A non-compliany conversion adds negative value to a house because you have to factor in the cost and disruption of ripping it all out before you do it again properly.

As per a more recent post, I am really concerned that building regs approval was not obtained as the details are not on the council website.