Kitchen Extension Architects in Winchmore Hill

Understand why the conservatory is uncomfortable, because it explains what the replacement has to do differently. A conservatory is mostly glass, including its roof, with very little insulation and a large solar gain. In summer the roof admits high sun directly, and the room overheats badly; in winter the same surfaces lose heat faster than any sensible heating system can replace it. The separating doors to the house exist partly to stop that thermal problem migrating into the rest of the ground floor.

That separation is also the legal hinge. A conservatory can be exempt from the building regulations where it meets conditions on floor area and glazing proportion, sits at ground level, and is separated from the house by external-quality doors. Remove those doors to open the space into the kitchen, or replace the glazed roof with a solid one, and the exemption falls away — what you have is an extension, and it has to meet the regulations for thermal performance, ventilation, structure and everything else.

That is not a reason to avoid the project. It is the reason the project is worth doing: an insulated extension with a solid or partly solid roof, properly detailed openings and a real heating strategy is usable every day of the year, which the conservatory never was. The footprint can often be retained, and sometimes the foundations too, though both need checking — conservatory bases were frequently built to a lighter standard than a habitable extension requires.

Design the roof first, because it is where the comfort is won. Replacing a fully glazed roof with an insulated one, with rooflights placed where daylight is actually needed rather than across the whole plan, transforms the room in both directions — no summer overheating, no winter heat loss — while keeping it bright. Where the outlook matters, putting the glazing in the vertical rear elevation instead, where an overhang can shade high summer sun and admit low winter sun, gives the view without the penalty.