Plenty of conservatories are really summer rooms. They are bright from April to September and then become a cold place to store boxes, with a dining table nobody uses between November and March. Owners often assume that a solid roof will fix that on its own. It goes a long way, but a conservatory has five other surfaces besides the roof: glazed walls, low walls, a floor, a door to the house, and a set of openings that let air in and out. Every one of them lets heat go or lets damp in. This guide works through the parts of a conservatory beyond the roof, in the order we would look at them, so you can judge what a year-round room would take on your own house. It will not give you a price for the whole conversion, because that depends on the frame and the heating you choose. It will help you decide which jobs are essential, which are optional, and which should be done first so that money is not wasted.
Start with what you want the room to do
A conservatory used for a morning coffee on mild days needs very little. A dining room, a home office or a children's playroom used every day of the year needs a great deal more. The standard you want sets the scope, so write it down before asking anyone for a price.
It helps to answer three questions. Will the room be used on winter evenings, when it has no sun to warm it? Will it need to be comfortable in July as well as January, since a room that holds winter heat well can overheat in summer without shading and ventilation? And will it be a room people sleep or work in for long periods, or one they walk through?
The answers push the project towards one of two routes. The first keeps the existing structure and upgrades parts of it: better glazing, a lined roof or a replacement roof, a new floor finish and a heat source. The second treats the conservatory as a small extension, with the walls, roof and floor all built or rebuilt to a warm standard. The second route costs more and takes longer, and it needs building control involvement at several stages. The first can often be done in a few visits.
Be realistic about the base. Many older conservatories sit on shallow foundations, with a thin concrete slab and no damp-proof membrane. The frame may have been made as a lightweight summer structure, and pushing it past that role needs a structural look. Our guide on insulating a conservatory roof deals with the roof part in depth, so here we concentrate on everything else, and on how the pieces fit together.
The roof is the first big job
Heat rises, and a thin glazed or polycarbonate roof is where a conservatory loses the most and is hottest in summer. For that reason the roof is nearly always the first thing to change when a room is meant for year-round use.
A solid roof, built as a warm roof with boards set between the rafters and over them, and a proper ceiling finish below, turns the ceiling from a cold surface into a normal one. It also lets you fit spotlights, a ceiling fan or a heater with confidence. Typical UK sources give a tiled conservatory roof a life of well over 50 years against 10 to 15 for polycarbonate, though those are ballpark lives and not promises.
Planning the roof first has a practical advantage. It is the part that most affects the structure, because the weight of the new covering falls on the frame and the walls. If the frame or foundations need strengthening, you want to find that out before the walls are lined and the floor is laid. A solid roof is treated as a material alteration and therefore needs a Building Regulations application, so allow time for it.
Not every owner needs a fully tiled roof. Some choose a lightweight system, and some choose a hybrid with solid sections and a glazed lantern in the middle to keep the light. We help you weigh up the options and cost on the survey, and we cover the value side in our answer on whether a solid conservatory roof adds value.
Walls, glazing and the dwarf wall
Below the roof, a conservatory has glazed panels held in a frame, sitting on low brick walls known as dwarf walls. Both lose heat.
The dwarf walls
Older conservatories often have a single skin of brick, or two skins with a cavity that was never filled. A single skin is cold and can feel damp on the inside. Options include filling a cavity, lining the inner face with insulated board and plasterboard, or dry-lining the whole wall. Which one fits depends on how thick the wall is and whether the damp-proof course sits at the right height. Raise the floor level and you may bury that course, so look at it first.
Glazing and frames
The windows and doors in a conservatory frame are often older double glazing with failed seals, visible as misting between the panes. Replacing the sealed units is far cheaper than replacing the frames, and it is often enough to make the walls perform. If the frames themselves are bowed, rotten or corroded, new units will not sit properly in them, and the frame has to be dealt with.
Keeping the view
A lot of owners worry that insulating will turn the room into a box. It need not. A sensible design keeps full-height glazing on the garden side and uses solid, insulated panels on the sides that face a neighbour or a north-facing wall. That balance gives light without the heat loss of a fully glazed room, and it cuts summer overheating.
Each of these jobs works much better in a sequence. Fix the roof, then the walls, then the floor and finishes, and the room ends up as a single warm space rather than a collection of patches.
Floors, heating and the opening to the house
People forget the floor until the room is otherwise finished. A thin slab laid straight on the ground feels cold underfoot and pulls heat out of the room all year. Laying insulation board over the slab and a screed or floating floor on top is the usual remedy, with underfloor heating as an option if the new build-up gives enough depth. A raised floor changes the door thresholds, the step from the house and the height of the cills, so it affects other work.
Heating is the next question. A conservatory with a good roof, warm walls and a sound floor needs far less heat than one with none of those, and the order matters: install the insulation first, then size the heating to what remains. A radiator tied into the house system is the simplest route. It does take capacity from the boiler and the house circuit, and the plumber will say whether the system can handle it. Electric underfloor heating or panel heaters avoid pipework, with a different running cost. Whichever you pick, a thermostat on the conservatory is worth having so that an open door to the house does not drain the main heating.
The opening between the house and the conservatory is a separate topic. Many conservatories are separated from the house by external-quality doors, and those doors are often kept in place so the conservatory can be closed off. If you plan to remove them and join the spaces, the room becomes part of the house, and you should ask your building control body (B&NES Council, or a private registered approver) what that requires before work starts. Legal advice is for them to give, though we can point you to the right contact.
Any electrical work, such as new sockets, lighting or underfloor heating, should be done and certified by a qualified electrician.
Air, damp and summer heat
A well-insulated conservatory is better at holding heat and also at holding moisture. If you seal the room and do not give it a way to breathe, condensation turns up on the glass and mould on the walls and window reveals.
The moisture comes from people, cooking, drying clothes and plants, and a room that was once draughty could dispose of it without help. Once it is tight it cannot. Trickle vents in the frames, a working extractor or a ventilation system, and doors that open fully on warm days all play a part. Our answer on conservatory condensation covers the causes in more detail, and a solid roof is part of the cure, though not the whole of it.
Summer is the opposite problem. A conservatory with a lot of south or west glazing and a well-insulated roof can overheat more than it did before, because the heat that gets in cannot escape through a thin roof the way it used to. The fixes are practical: solar-control glass in the wall units, external shading, roof windows or vents that open, and a through-draught from one side of the room to the other. Roof windows in a solid roof have their own rules, and the planning side of rooflights is covered under our roof windows and skylights service.
Plan the ventilation along with the insulation. A year-round room needs both from the start, and a designer who covers only one has covered half the job.
Order of work, checks and a realistic budget
A sensible order saves money. Start with a survey of the frame, foundations and walls. Then deal with anything that leaks or has failed, because insulating over a leak hides the damage and makes it expensive. Next comes the roof, then the glazing units and walls, then the floor, then heating, electrics and decoration.
Repair comes before replacement where it can. If the roof leaks only at the bars or seals, a repair may be all that is needed for now, and our guide to conservatory roof repairs explains how those faults are fixed. If the repairs would be repeated every few years, the money is better put towards a roof that stays sound.
On cost, the published guides cover only the roof. For the roof alone, MyBuilder (2026) reports replacements typically costing £2,000 to well over £10,000, and tiled roofs near £4,000 at £50 to £100 per square metre. Those are national figures, not Empire prices. There is no published figure we can rely on for the walls, floor and heating, and they vary too much with the building, so they are priced from a survey rather than a table.
At the survey we inspect the frame, the base, the walls, the roof and the house junction, with pictures of your own conservatory sent afterwards. The roof work is then priced as a fixed sum in writing, scope listed line by line, so you can see which items depend on the frame being sound and which do not. Where other trades are needed for plumbing or electrics, we will say so rather than pretend the roof covers it all. The service page for conservatory roof replacement sets out how the work runs from start to finish.