Conservatories (UK Guide)

A conservatory can give you a brighter dining area, a quiet place to read or a closer connection to the garden. The right choice starts with how you want to use the room, then works through the roof, glazing, layout and budget.

This UK guide explains the options and the questions to ask before you order. For a starting budget, try our Orangery & Conservatory Cost Calculator. Its estimates help you plan; an installer’s survey and written specification establish the final price.

What is a conservatory?

A conservatory is a glazed addition to a home, typically with large windows and a glass or polycarbonate roof. Contemporary designs may use a solid or hybrid roof, but changing the roof can also change the structural and approval requirements.

An orangery generally has more solid walling and a roof lantern within an insulated roof. A conventional extension has a more substantial solid structure. Choose according to daylight, privacy, comfort and how closely the room should connect to the house. Our orangery versus conservatory comparison explores the differences.

Styles, sizes and layout

Start with furniture and walking space, rather than choosing the largest footprint that fits. Mark out a table, chairs, sofa and the route to the garden. Allow clearance for doors and check how the new room affects daylight in the existing house.

• Lean-to: a rectangular layout with a sloping roof, often useful where space or roof height is limited.
• Edwardian: a square or rectangular floor plan that is straightforward to furnish.
• Victorian: a faceted bay front with a traditional appearance; check how the angled corners work with furniture.
• Gable-front: a higher, more open roof profile for a sense of height and light.
• P-shaped or bespoke: useful for separate sitting and dining zones, with more complex foundations, roof junctions and detailing.

Consider drains, boundaries, nearby trees and construction access. A small, well-planned room may be more useful than a large room that is hard to heat, shade or furnish.

Frame materials: uPVC, aluminium and timber

uPVC

Often a practical choice when budget and easy upkeep are priorities. Compare reinforcement, sightlines, hardware, colour warranties and the complete frame-and-glass specification. Our uPVC windows explains the main performance terms.

Aluminium

Useful for slim sightlines and larger glazed openings. Specify thermally broken profiles and compare whole-product performance. The finish, colour, glass and door system can make a substantial difference to the quote.

Timber

Can suit traditional properties and bespoke designs. Ask about the timber species, factory finish, maintenance schedule and warranty conditions. Budget for future care as well as the initial installation.

Frame material alone does not determine comfort. The roof, glazing, floor, seals and installation need to work together.

Glass, solid and hybrid roofs

Glass roof

Maximises views of the sky and daylight. Discuss solar gain, glare, roof ventilation, cleaning access and rain noise. Solar-control glass can help manage heat gain, alongside shading and ventilation.

Polycarbonate roof

An option often found on older or budget conservatories. Compare its insulation, sound and light characteristics with current alternatives before choosing it solely on price.

Solid or tiled roof

Can create a more enclosed, room-like feel. It also reduces overhead daylight, including light reaching the adjoining room. Existing frames and foundations need assessment before a replacement roof is specified.

Hybrid roof

Combines insulated sections with roof glazing. Decide where you need daylight and where a solid area would help with shading, lighting or furniture placement. See our conservatory roof replacement guide for more questions to ask.

Glazing, insulation and year-round comfort

A comfortable conservatory needs more than double glazing. Plan for winter heat loss and summer overheating together, especially on south- and west-facing elevations.

• Insulation: ask about the floor, roof and solid walls, not just the glass.
• Glazing: compare whole-window or whole-door U-values, solar gain and light transmission.
• Ventilation: plan opening windows, roof vents where appropriate, and a practical route for fresh air.
• Shading: consider suitable blinds and external shading without losing the view you wanted.
• Heating: choose controls and a system appropriate to the approved design and intended use.

Low-emissivity glass helps reduce heat loss; the Energy Saving Trust’s windows and doors guidance explains the basics. Ask your supplier how the specification addresses your room’s orientation.

For wide garden openings, compare bifold doors with sliding or French doors. Think about ventilation, furniture clearance, thresholds and everyday access as well as appearance.

Common conservatory problems: heat, cold and condensation

If the room is uncomfortable, identify the cause before choosing an upgrade. A new roof cannot repair a failing base, and a heater cannot stop excessive summer solar gain.

• Too hot: assess solar-control glazing, shading and opening windows or roof vents appropriate to the design.
• Too cold: check roof and floor insulation, seals, glazing and controllable heating.
• Condensation: review moisture sources, ventilation and cold surfaces. Ask an installer to investigate misting inside a sealed unit or water ingress.
• Leaks or sticking doors: have drainage, roof junctions, seals and movement checked before cosmetic repairs.

The Glass and Glazing Federation’s conservatory guidance explains how ventilation, glazing and temperature control work together. For a roof conversion or an open-plan kitchen, also review the Federation of Master Builders’ guide to upgrading and converting conservatories.

Costs and what your quote should include

A low headline price is difficult to judge unless you know what it covers. Reusing a suitable base is different from a complete new build, and a simple glazed room is different from a fully finished space with upgraded doors and electrics.

Use our conservatory cost calculator to explore a starting range. Ask each installer for an itemised quote covering:

• Survey, drawings and responsibility for applications.
• Excavation, foundations, base, insulation and drainage work.
• Walls, frames, glazing, doors and the complete roof system.
• Electrical work, heating, plastering, flooring and decoration, where required.
• Site access, waste removal, making good and VAT.
• Exclusions, provisional allowances and how extra work will be agreed.

Keep a contingency for site conditions that cannot be confirmed until the survey or excavation. A detailed specification is more useful than a promised percentage saving.

New build, roof upgrade or repair?

Budget these as separate scopes. A new build may include foundations, frames, roof, services and finishing; a roof upgrade may retain much of the existing structure after assessment. A repair addresses a specific fault. Ask for the retained components and exclusions to be listed so the prices can be compared fairly.

Planning permission and Building Regulations

These are separate checks. The guidance below relates to England. Rules in Wales, Scotland and Northern Ireland differ; confirm the requirements for your location and property before committing to work.

Planning permission

Conservatories follow extension planning rules. Some qualify as permitted development, but size, height, position, previous extensions and property restrictions matter. Flats and properties with restricted development rights need particular care. Read the Planning Portal guidance and confirm your proposal with the local planning authority.

Building Regulations

In England, an exemption can apply to a single-storey conservatory at ground level with a floor area under 30 m², subject to conditions. These include external-quality separation from the house, independent heating controls, and compliant glazing and fixed electrics. A new structural opening needs approval even when the conservatory itself is exempt.

Removing the separating doors or replacing the roof requires a fresh assessment. Ask building control to confirm the proposed work; see the conservatory Building Regulations guidance.

Installation, maintenance and guarantees

Agree who is responsible for the survey, foundations, roof, glazing, electrics and finishing. Request a programme that distinguishes approvals, manufacturing and work on site. Access, weather and unexpected ground conditions can affect timing.

At handover, check door operation, drainage, seals, roof junctions and agreed finishes. Keep the contract, specification, guarantees, maintenance instructions and completion certificates together.

Clean frames and glass using the manufacturer’s recommended methods. Keep gutters and drainage channels clear, look for damaged seals and address leaks promptly. Do not climb onto the roof to clean it.

Compare product and workmanship guarantees separately. Check exclusions, maintenance requirements, transferability and who you contact if a problem arises.

Conservatory, orangery or extension: which suits your project?

Start with the room’s purpose rather than its marketing name. A bright seasonal sitting area, a separate dining room and an open-plan kitchen extension involve different expectations for structure, insulation and connection to the house. The actual construction determines how the space behaves.

Compare orangery options if you want more solid wall space and a different ceiling arrangement. Avoid choosing a label first and discovering later that the quoted construction cannot support the kitchen, heating or open-plan layout you expected.

Designing for the sun, privacy and furniture

Record when the proposed area receives direct sun and how it is shaded by the house, trees and neighbouring buildings. South- and west-facing glass can need particular attention to summer comfort, while a shaded site may make daylight a higher priority. Discuss orientation at the first survey.

Draw furniture and circulation routes to scale. Allow room to pull chairs back, open doors and reach ventilation controls. A faceted bay may look attractive but provide less convenient wall space for a cupboard than a rectangular plan.

Consider views in both directions. Full-height glazing can reveal stored items and evening activities to neighbours. Compare suitable privacy solutions without sacrificing the daylight you wanted. Position sockets, lighting and switches before wall and glazing locations are finalised.

Reading roof and glazing specifications

Ask for the roof system name and the precise specification rather than “premium glass” or “warm roof”. Establish which figures describe the glass, a roof panel or the completed assembly. A value for one component cannot be treated as the heat-loss figure for the entire room.

For glass, discuss U-value, solar gain and light transmission as separate properties. For an insulated roof, discuss the build-up, support, roof junctions, internal finish and any glazed areas. Confirm that roof glazing and doors are specified for their intended locations.

Ask how maintenance can be carried out safely and whether the proposed design makes gutters, vents and roof junctions accessible to a professional. The most appealing photograph is not always the most practical design for cleaning or repairs.

Foundations, drainage and reusing an existing base

A patio or old slab is not automatically a suitable base for a new room. Foundation design needs to reflect the ground, nearby trees, drainage and proposed structure. If reusing a conservatory base, have its condition and suitability assessed rather than assuming an apparently level floor proves adequate support.

Confirm what excavation, drainage alterations, insulation and floor construction the quote includes. Agree how concealed conditions will be recorded and how extra work will be approved. Ask for photographs before foundations and floor layers are covered.

Replacing a light roof with a different system can change the loads on the existing structure. Assess the base, frames and connections together. A roof installer should explain the extent of its assessment and who supplies any required structural design.

Upgrade an old conservatory or start again?

List the problems separately: overheating, a leaking roof, misted glazing, a cold floor and sticking doors may have different causes. A new roof may improve one aspect without addressing the others. Compare the condition of the complete structure before choosing a single upgrade.

Repair can make sense for isolated defects where the rest of the construction remains suitable. A roof or glazing upgrade can be worth comparing where the base and frames can be retained. A complete rebuild may be more appropriate when the layout, foundations or structural condition cannot support the intended use.

Ask each supplier to explain what remains after its work, what performance it expects and which old components remain outside its warranty. This makes an upgrade quote easier to compare with the scope and disruption of a new build.

Kitchen conversions and open-plan living

A separate dining room and a kitchen connected directly to the house are not equivalent projects. A kitchen proposal needs a coordinated design for structure, insulation, ventilation, water, waste, electrical services and any required approvals. Removing separating doors should not be treated as an incidental finishing choice.

Price the conversion as a whole, including adjoining-room alterations, lighting, flooring and making good. A quote covering only a roof conversion may leave most of the kitchen work and compliance responsibilities unresolved. Ask who coordinates the trades and signs off each part.

Conservatory buying checklist

• State the intended use and whether the room remains separate from the house.
• Compare internal usable dimensions, furniture layout and garden access.
• Check orientation, shading, ventilation and heating together.
• Record the roof, glass, frames, doors and floor specifications.
• Confirm base suitability and responsibilities for structural assessment.
• Separate fixed prices from allowances for concealed conditions.
• Agree approvals, payment stages, warranties and handover documents.

A clear specification lets you compare the benefit of each proposal rather than a collection of unrelated headline prices. Bring the same checklist to every survey and record the supplier’s answers before deciding.

How to compare conservatory quotes

Give each installer the same brief: intended use, approximate size, roof preference, door style, finish and budget priorities. Ask for the same scope so a lower price is not simply omitting foundations, electrics or finishing.

1. Check the written specification and what remains an allowance.
2. Ask for relevant experience, references and examples of similar work.
3. Confirm approvals, warranties, insurance and responsibility for each trade.
4. Review payment stages, the programme and how changes will be agreed.
5. Choose based on the whole proposal, rather than the headline price alone.

Bestpricevalue.com helps homeowners understand options and connect with suitable installers. Request free conservatory quotes and tell us about your project. Your chosen installer confirms the survey, specification and final price; you decide whether to proceed.

Frequently asked questions

Do I need planning permission for a conservatory?

In England, some conservatories qualify as permitted development, provided the property and proposal meet all relevant limits and conditions. This is not automatic. Check with your local planning authority before ordering; rules differ elsewhere in the UK.

Does a conservatory need Building Regulations approval?

Some small, separate conservatories in England can be exempt, subject to conditions. Removing the separation from the house, creating a new structural opening or changing the roof can affect approval requirements. Ask building control to confirm your design.

Can I use a conservatory throughout the year?

Potentially, but comfort depends on roof and floor insulation, glazing, shading, ventilation and appropriate heating. A south-facing glass room needs a different approach from a shaded room. Double glazing alone does not guarantee year-round comfort.

How much does a new conservatory cost?

There is no single reliable price without a specification and site survey. Size, foundations, roof type, frames, doors, electrics, access and finishing all affect the total. Use our Orangery and Conservatory Cost Calculator for an indicative budget, then compare itemised installer quotes.

Can I replace the roof without replacing the whole conservatory?

Sometimes. The existing base, frames and supporting structure must be assessed for the proposed roof and its loads. Ask for written confirmation of structural suitability, necessary approvals and exactly what the replacement includes.

What is the difference between a conservatory and an orangery?

A conservatory generally has more glazing and often a glazed roof. An orangery usually includes more solid construction and an insulated roof perimeter with a lantern. The actual construction and connection to the house determine performance and approval requirements.

Will a conservatory increase my property value?

It may improve appeal and usable space, but an increase in value is not guaranteed. Design, build quality, comfort, the remaining garden and the local market all matter. Ask a local estate agent for a property-specific view rather than relying on a fixed percentage.

Why is my conservatory too hot in summer and too cold in winter?

Large glazed areas admit solar heat, while an inadequately insulated roof or floor can lose heat quickly in colder weather. Start with the room’s orientation, glazing, shading, ventilation and insulation. Heating or cooling alone may leave the underlying problem unresolved.

How do I reduce condensation in a conservatory?

Moist indoor air can condense on colder glass and frames. Reduce moisture sources, use the designed ventilation and maintain suitable background warmth. Persistent condensation between sealed panes, water entering during rain or damp at the base needs an installer’s assessment rather than simply more heating.

Can I remove the doors between the conservatory and the house?

Do not assume that removing the doors is a minor alteration. It changes thermal separation and can affect Building Regulations requirements. Have the proposed layout and any structural opening assessed before starting work.

Can a conservatory become a kitchen or dining extension?

A separate dining space and an open-plan kitchen extension are different projects. A kitchen conversion needs a design that addresses structure, insulation, ventilation, services and approvals. Existing foundations and frames may need upgrading or replacement.

Does a conservatory need proper foundations?

Yes. Foundation design depends on the ground, drains, trees and proposed structure. Do not assume an existing patio or concrete slab is suitable. Have any base you plan to reuse assessed before ordering the conservatory.

How long does a conservatory last?

There is no guaranteed lifespan for the whole structure. The base, frames, sealed glazing units, roof seals and moving parts age differently. Maintenance, exposure and build quality matter; compare the condition of each part before deciding between repair and replacement.

Content reviewed: 1 October 2026. Estimates are indicative; specifications and approval requirements depend on your property and location.