A conservatory can provide valuable additional space while bringing more natural light into a home. It can be used as a dining area, garden room, playroom, home office, or additional living space, depending on its size, design and specification. The cost of a conservatory varies depending on its size, style, materials, roof type and internal specification. Groundworks, glazing, doors, heating, flooring, and electrical work can all affect the final budget.
How Much Do Conservatories Cost?
A typical conservatory in the UK currently costs around £9,000–£18,000, depending on its design and materials. For a 3.5m × 3.5m conservatory, current estimates put a uPVC lean-to at around £10,250, a uPVC Victorian conservatory at approximately £12,750 and a uPVC Edwardian conservatory at around £11,250.
Timber conservatories generally cost more. A wooden lean-to can cost around £13,500, while a wooden Victorian conservatory can average approximately £16,750. An Edwardian timber conservatory can cost around £15,750. These figures are indicative rather than fixed prices. A bespoke design, larger footprint, premium glazing or upgraded roof can increase the overall cost considerably.
What Does a Conservatory Cost?
Lean-To Conservatory
A lean-to conservatory is generally one of the simpler and more economical conservatory designs. Its straightforward roof structure can make it suitable for properties with limited space or homeowners looking for a practical addition. For a 3.5m × 3.5m conservatory, a uPVC lean-to currently costs around £9,000–£11,500, with an average of approximately £10,250. A timber lean-to can cost around £12,750–£14,250. The roof material can also have a substantial effect on the cost. For example, current estimates for a 3m × 3m lean-to range from around £8,100–£11,880 with a polycarbonate roof to approximately £18,000–£26,400 with a tiled roof.
Victorian Conservatory
Victorian conservatories typically feature a pitched roof and rounded frontage. Their traditional appearance makes them a popular choice for a range of properties. A 3.5m × 3.5m uPVC Victorian conservatory currently costs around £12,000–£13,500, with an average of approximately £12,750. A timber version can cost around £16,000–£17,500.
Edwardian Conservatory
Edwardian conservatories have a flat frontage and a more rectangular layout, which can make efficient use of the available floor area. A 3.5m × 3.5m uPVC Edwardian conservatory costs approximately £10,500–£12,000, while a timber version can cost around £13,500–£18,000.
P-Shaped Conservatory
A P-shaped conservatory combines two sections to create a larger and more varied layout. This can provide separate areas for different uses, such as dining and relaxing. Current estimates put the cost of a medium P-shaped conservatory at around £14,000–£19,500, depending on the specification.
What Factors Affect Conservatory Costs?
Size and Layout
The size of the conservatory is one of the main factors affecting the overall cost. A larger structure requires more foundations, glazing, roofing materials, flooring and labour. A more complex layout can also increase the cost because it may require additional structural work and bespoke components.
Frame Materials
uPVC is generally more economical than timber, while aluminium and bespoke timber systems can increase the overall price. The choice of frame should consider not only the initial cost but also appearance, maintenance, thermal performance and how well the design complements the existing property.
Roof Type
The roof can have a significant effect on the total cost. Traditional glazed or polycarbonate roofs may be relatively economical, while solid or tiled roofs can cost considerably more. For a 3m × 3m lean-to conservatory, current estimates range from approximately £8,100–£11,880 for a polycarbonate roof to £18,000–£26,400 for a tiled roof.
Doors and Glazing
Large areas of glazing are an important feature of most conservatories, but the specification of the glass and doors can affect the overall budget. Bi-fold doors, sliding doors, bespoke windows and higher-performance glazing can increase the cost compared with standard uPVC options.
Internal Finishes
The cost of flooring, lighting, heating, decoration and other internal finishes should be included in the overall budget. If the conservatory is intended to function as a year-round living space, additional insulation, heating and ventilation may also need to be considered.
Does a Conservatory Need Planning Permission?
In England, conservatories are generally subject to the same permitted development rules as other house extensions. A conservatory can be built without a planning application where the relevant limitations and conditions are met. The rules apply to houses and take account of the proposed conservatory alongside previous extensions and other enlargement of the property.
Permitted development rights may be restricted or removed by planning conditions, Article 4 Directions or other restrictions. They do not generally apply to flats and maisonettes. Where the proposal exceeds the relevant permitted development limits, a householder planning application may be required.
Can a Conservatory Be Built Under Permitted Development?
A typical single-storey conservatory can often be built under permitted development if it meets the relevant conditions. For example, the highest part of the conservatory should generally be no higher than the roof ridge of the existing house. Where a conservatory is within two metres of a boundary, its eaves height should not exceed three metres. Additional restrictions can apply depending on the position of the conservatory and whether the property is on designated land.
On designated land, including conservation areas, additional restrictions apply. For example, a conservatory extending beyond a side wall of the original house is not permitted development in these areas. It is therefore important to assess the property and its planning history before relying on permitted development rights.
Can a Conservatory Be Larger Than the Permitted Development Limits?
A conservatory that exceeds the applicable permitted development limitations may require planning permission. Previous extensions must also be taken into account because permitted development rules apply to the total enlargement of the house. A property that has already been extended may have less scope remaining under permitted development rights.
A planning assessment before construction can help establish whether the proposed conservatory can proceed under permitted development or whether a planning application is necessary.
Do Conservatories Need Building Regulations Approval?
A conservatory can be exempt from building regulations where specific conditions are met. These include being built at ground level, having a floor area of less than 30 square metres, remaining separated from the house by external-quality walls, doors or windows, and having an independent heating system with separate controls. The glazing and fixed electrical installations must also comply with the relevant requirements.
However, a new structural opening between the conservatory and the existing house will require Building Regulations approval, even where the conservatory itself would otherwise qualify for an exemption. Planning permission and building regulations are therefore separate considerations when planning a conservatory.
What Other Costs Should You Budget For?
The construction price is only one part of the overall conservatory budget. Other costs can include:
- Architectural and planning drawings
- Planning application fees, where required
- Building Regulations approval, where applicable
- Foundations and groundworks
- Drainage alterations
- Electrical installations
- Heating
- Flooring
- Internal decoration
- Kitchen or utility fittings
- Specialist glazing
- Landscaping and external works
- Professional consultant fees
- Contingency for unexpected costs
If an existing conservatory is being upgraded rather than replaced, additional costs may include roof, window and door replacement. Current estimates put roof replacement at around £3,000–£5,000 for glass or £5,000–£7,000 for a solid roof.
Common Conservatory Cost Mistakes to Avoid
Conservatory projects can become more expensive than expected when important costs and requirements are overlooked. Common mistakes include:
- Budgeting only for the main conservatory structure.
- Choosing premium glazing without allowing for the additional cost.
- Underestimating the cost of the roof.
- Failing to budget for foundations and groundworks.
- Forgetting heating, lighting and flooring costs.
- Assuming every conservatory qualifies as permitted development.
- Failing to check previous extensions.
- Confusing planning permission with Building Regulations.
- Starting construction before confirming the relevant requirements.
- Not including a contingency for unexpected costs.
Establishing the planning, design and construction requirements at an early stage can help you create a more realistic budget.
Should You Get a Planning Appraisal for Your Conservatory?
A planning appraisal can help establish whether your proposed conservatory is likely to benefit from permitted development rights or whether planning permission may be required. This can be particularly important where the property has already been extended, is located within a conservation area or has other restrictions affecting permitted development rights. Where you intend to rely on permitted development, a Lawful Development Certificate can also provide formal confirmation that the proposed development is lawful.
How Studio Charrette Can Support Your Conservatory Project
Studio Charrette can support homeowners with the planning and architectural aspects of conservatory projects, from assessing the initial proposal through to design, drawings and the relevant planning process. The design can be developed around the existing property, the intended use of the additional space and the applicable planning requirements.
Studio Charrette provides planning services, architectural design, structural design and building services, allowing different aspects of a project to be considered together. Professional advice at an early stage can help you establish the planning position, identify potential restrictions and develop a realistic budget before construction begins.
Planning a Successful Conservatory Project
The cost of a conservatory depends on its size, style, frame material, roof type, glazing and internal specification. As a general guide, a typical conservatory can cost around £9,000–£18,000, while bespoke designs and higher-specification projects can cost considerably more.
Before starting work, it is important to consider the construction cost alongside planning requirements, building regulations, professional fees, groundworks, glazing, heating and internal finishes. Establishing these requirements at an early stage can help you make informed decisions about the size, design and specification of your conservatory. If you need advice on your proposed conservatory, contact Studio Charrette for professional planning and architectural support.
Frequently Asked Questions
How much does a conservatory cost in the UK?
A typical conservatory can cost around £9,000–£18,000, depending on its size, style, materials and specification. A 3.5m × 3.5m uPVC lean-to currently averages approximately £10,250, while a uPVC Victorian conservatory averages around £12,750.
Is £10,000 enough for a conservatory?
A £10,000 budget may be suitable for a relatively simple conservatory, particularly a smaller uPVC lean-to. Larger designs, timber frames, premium glazing and upgraded roofs can increase the cost considerably.
What is the cheapest type of conservatory?
A lean-to conservatory is generally one of the more economical designs. A 3.5m × 3.5m uPVC lean-to currently costs around £9,000–£11,500.
Do conservatories need planning permission?
Not necessarily. A conservatory can generally be permitted development in England if it meets the relevant limitations and conditions. Planning permission may be required if those limits are exceeded or if permitted development rights have been restricted or removed.
Can I build a conservatory under permitted development?
Yes, many typical single-storey conservatories can be built under permitted development where the relevant conditions are satisfied. The property’s previous extensions and planning history must also be considered.
