This quotation sets out the work, the price and what is provisional. Please read the assumptions and exclusions before accepting.

What we will build

• Conservatory or orangery: 3.5m × 4m (external), approximately 12.9 m² internal floor area.
• Walls: glazed frames on a dwarf wall finished in facing brick.
• Roof: flat warm-deck roof in epdm.
• Foundations and floor: trench-fill foundations, concrete slab with insulation.
• Windows and doors: none.
• Completed to: complete finish (standard specification).
• Services: 4 power points, 2 light fittings, radiators from the existing system.

Price breakdown

About the provisional sums

These are estimates for items that cannot be priced firmly yet. They are confirmed with you before that work starts.

• Glazed wall frames and doors: Conservatory/orangery frames and glazed roof panels to 11.0m of elevation. These are manufactured to order; the allowance is replaced by the supplier's quotation.

Assumptions this price relies on

• Conservatories under 30 m² separated from the house by external-quality doors are usually exempt from building regulations; an orangery with a solid roof generally is not.
• Foundations: trench fill 600mm wide × 1.0m deep in GEN1 concrete under all new external walls.
• Ground floor: 100mm concrete slab on 150mm compacted hardcore with 100mm PIR insulation.
• Glazed frames sit on a 600mm cavity dwarf wall; frames priced as a supplier allowance.
• Roof lantern priced at a standard 2m × 1m size; sizes and glazing spec vary the price, so confirm with the supplier.
• Flat roof: warm-deck construction with 120mm PIR, 47×195 C24 joists at 400 centres with firrings to fall, epdm rubber roof membrane with adhesives & trims.
• Drainage: rainwater and any foul water connected to the existing system within 6m, capacity assumed adequate. Building over or near an existing sewer needs the water company's agreement.
• The existing consumer unit has spare capacity for the new circuits; if not, a new unit is extra.
• Heating: 2 radiators added to the existing system; the existing boiler is assumed to have capacity.
• No planning application fee, party wall surveyor or planning drawings are included. Permitted development or existing consent is assumed.
• Work to comply with the building regulations applying in England; design by others where a design is required.

Not included

• Planning application, drawings and party wall matters
• Furniture, appliances and loose fittings
• Landscaping and reinstatement beyond the working area
• Anything found on opening up that could not be seen at survey
• Blinds and glazing film

Programme, validity and payment

• Estimated time on site: about 3 weeks, subject to weather, materials and approvals.
• Payment in stages:

  Deposit on acceptance	10%	£4,873.80
  Watertight shell	40%	£19,495.20
  First and second fix complete	30%	£14,621.40
  Completion and handover	20%	£9,747.60

• Payment: Each stage is invoiced when it is reached and is due within 7 days.