Factors Affecting Conservatory Prices


The main factors affecting conservatory price are:

Glazed Extensions (excluding Building Work)

  • Location: Instead of having three sides, frequently a conservatory is into a corner, with just two sides, or sometimes into a courtyard, with only one side. Occasionally, a conservatory is freestanding with four sides.
  • Size: width, projection, frame height, height at house wall
  • Type: Conservatory with a glass roof, Orangery having flat roof and central lantern or Garden Room with tiled or slate roof.
  • Material: excluding building work costs, from white PVC at 45% of the cost of Oak, rising through coloured PVC, aluminium, softwood such as Russian Larch or European Redwood (Pine), through various hardwoods, such as sapele, idigbo or iroko, to the very best seasoned Oak
  • Frame type: Storm-proof sashes, standard with 70mm frames. Flush, conservation sashes with 90mm frames and dummy sashes to fixtures. Typical for Listed Properties.
  • Frame features: Do you require glazing bars, such as Georgian style squares, leaded lights or coloured glass features?
  • Doors: number and position of doors or double doors (recommended door width 700-800) or more expensive multi-pane or bifold doors.
  • Window openings: number and position of openings (recommended window width 700-800) Recommended min of 2 full height openings, 4 if conservatory over 10 sq.m.
  • Frame/roof centres: Important – window sashes shouldn’t exceed 800mm, if you want the roof rafters to align with the frames.
  • Roof Design: the simpler the design, the lower the price.
  • Box Gutters: Does the design require a box gutter. If so, does it need to be structural?
  • Insulation: A rated glazing with minimum of 1.2 u value recommended
  • Roof glass: solar control glass should be standard unless in the shadow of a North facing house (0.9-1.0 u value, keeps out up to ​83% of unwanted heat)
  • Frame glass: clear solar control glass with 1.0 u value, should be used on South facing conservatories.
  • Roof Ventilation: warm air rises – it’s essential to fit roof vents minimum one up to 12 sq.m., two over. These can be manual, electric or automatic.
  • Planning: Depending upon the position and size, amongst other factors, such as being Listed, in a conservation area, green belt, National Park, or area of outstanding natural beauty, etc. will determine whether you need to allow for Planning Costs.
  • Building Regulations: will be required if, above 4m in height from ground, over 30 sq.m floor space, open plan with house or mainly solid roof.

Once you have decided upon the design and specifications for you conservatory, the following are the building work considerations, which will cost the same,  whether the frame material be PVC, Aluminium, or any type of Timber.

Building Work

  • Access: Is there good access to the site, or does it have to go through the house, up or down steps, or on a first or higher floor?
  • Demolition: Is there an existing building, conservatory or are there other obstructions to consider, such as boiler flues.
  • Drainage: Are there any shared drains crossing within 3m of conservatory, or manholes in line with footings. A Waterboard 'Build Over Agreement' will be required if your glazed extension is to be built within 3m of a shared drain.
  • Type of base: strip footings 1m deep standard, but additional cost of deeper footings, raft or piling may be required, if poor soil conditions or trees within 7m
  • Ground levels: sloping sites will require brickwork build-up or excavation with retaining walls.
  • Walls: insulated dwarf cavity walls are standard, but sometime full height frames are required and sometime full height or parapet walls.
  • Knock throughs: Are you opening up to the house and does this involve new steel lintels, structural calculations and heat loss submissions for building regulations.
  • Flooring: do you intend to have tiles, laminated timber, Amtico style vinyl, or carpet.
  • Underfloor heating: Do you require electric or wet underfloor heating system? If not radiators and how many?
  • Electrics: How many sockets, lights, switches, TV points, etc. do you require? How near is your consumer unit?
  • Plumbing: Are there any radiators to remove, move, or new ones required? External Tap?
  • Landscaping: Do you require any additional patio work, new steps, etc.?

You will have recognised, that whilst the cost difference between the conservatory main structure remains the major variable, there will be many factors which may be constant, such as size, design, glass specification, and all the building costs, which together significantly reduce the percentage cost difference between the least costly PVC option and the biggest investment you consider making.

Investing in a conservatory or orangery has very similar design and cost factors to take into consideration as when replacing your kitchen. From the designer’s point of view, it is essential to have some idea of your budget.

For example, to offer a plastic laminate kitchen with Whirlpool appliances for £4,500 may prove to be exactly what the kitchen customer wants, however, it could be perceived as an insult to the aspirations of a customer whose budget is £35,000 and wants solid oak doors, granite work surfaces and Neff appliances. Conversely, to raise the aspirations of the customer with the £4,500 budget to that of Oak and Neff, is grossly unfair and could lead to embarrassment.

In the same way, it is important for the conservatory designer to have some idea of your budget before he starts suggesting ideas, size, materials and specifications, so as he/she can best advice you, to meet your requirements and budget.

Contact Richmond Oak for advice from experienced designers, where we can provide you with a choice of material, to meet almost any sensible budget.

Richmond Oak Conservatories

Established 2008

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Richmond Oak Conservatories Buyers Guide

Need a little more information?

To help you with your buying decision of your bespoke hardwood conservatory or orangery, we have put together the Richmond Oak Buyers Guide.

"What you need to know when planning to Improve Your Home with a Conservatory or Orangery".

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