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Hi there. This is my first post on the buildhub. I'm a halfways capable DIY-er, with more mistakes behind me than successes, but I learn. My current problem is the ventilation of my sons' bedrooms. Do you think you can help please? The window in each room has no trickle vent. Please see the attached photos. I do have a sliding vent above each bedroom into the hall. With 3 boys sharing two rooms, a lot of moisture and smell is generated overnight. I am not keen on leaving the windows open overnight, due to draughts and security. After watching a DIY video explaining how to retro-fit a trickle vent in a DG window, I drilled a pilot hole in one window frame, expecting a short penetration into void space within the frame that could likewise be accessed from the other side. Instead I hit something solid - possibly metal reinforcement within the frame. Anyways it looks like trickle vents are out, unless you can advise on what I might be doing wrong with the window frame, or perhaps suggest another means, e.g. through the brick wall? I'm concerned in any case these vents are passive and largely uncontrollable. They are also subject to clogging and the effects of wind and other weather stuff. Buildhub led me to the idea of PIV. I have plenty accessible space in my loft and easy access to gable ends, but not much money. I suspect they are expensive? I have two bathrooms, a kitchen and a living room, as well as 3 bedrooms to be involved in PIV. Do you think that might be a solution? What are the limitations? Can I DIY the installation? I also read about MVHR. Do you think that could work? Again, I don't have much money, what are the limitations? Can I DIY the installation? I read that this solution is dependent on air tightness levels of 5ach or below (air changes per hour). No idea how I can measure that. Do you know? A few questions here. Apologies. I hope you can provide some good advice that will help me. Ay. James.

Hi All, I am currently preparing building regulation drawings for an extension to care home. The extension is only providing a link corridor between two parts of the property. However habitable rooms will have windows that open into the corridor. I'm struggling to find any guidelines that would be applicable for this type of extension regarding what ventilation to provide. Can anyone on here point me in the right directions?