New! Fixed priced House Extension Quotations Within Minutes

House Extension Quotation

Get A Fixed Price Quotation In Minutes

Start constructing your new house extension by selecting the options below to get an instant fixed priced quotation within minutes.

Advanced New Builds have created the worlds first and most comprehensive 'instant' house extension quotation tool.

Know the cost of a new house extension within 5 minutes, our quotation tool combines the cost of planning, drawings, materials and labour, giving you a fixed price quotation to construct your new extension.

Architectural Plans, Planning Permission Costs, Building Regulations Approval and Structural Calculations All Included!
  • Architectural Plans
  • Planning Permission Costs
  • Building Regulations Approval
  • Structural Calculations

Select from either a single storey extension or a two storey extension
Single storey or two storey extension
single or two storey Extension

Select the extension size by the total ground floor area in square metres m2 - for example: ( 3m x 5m =15m2 )
Extension size by the total ground floor area in m2
Enter the floor area of the extension

Select an exterior wall finish, if you choose a red, yellow or multi blend brick - we'll always attempt to supply the best match as possible to the existing building
Red, yellow or a multi blend
Brick Colours
Alternatively to selecting a wall finish you can also choose to match the bricks, render or cladding on your house. Simply upload a photo of your property and leave the wall finish selection as (Match Brickwork) or (Match Render) or (Match Cladding) in the drop down menu
Sand & cement render, synthetic waterproof render or a cladding finish
Wall Finishes Render and Cladding

Select if any structual steels are required, opening the back of the property up into the new extension or taking additional walls upstairs in the new extension
How many steel beams are required
Steel beam at the back of the existing house or in the new extension
Steel beams

Select a flat roof - lean to roof - or pitched roof
Flat roof, lean-to roof or a pitched roof
Roof types for your extensions

Select lights main light or downlights
Please select the number of rooms a new light installation is required
Main light or multiple down lights
Select lights

Select the number of sockets required
Please select the number of sockets are required
Select white, chrome or brushed steel sockets
Select plug sockets

Select underfloor heating and area size either warm water or electric
Under floor heating, warm water or electric
Underfloor heating

Select if radiators are required
Standard radiators or designer radiators
Radiators standard or designer

If you've chosen a painted decorated finish - please select your colour - this will also be re-comfirmed at a later date
Plaster finish or a fully decorated finish
Select an Internal finish

Select internal doors and quantities
Select how many internal doors are required
White, white glazed, oak veneer or oak veneer glazed
Internal doors

Select a flooring finish includes underlay / grout and fitting
Laminate, engineered wood, carpet or high gloss tiles
Flooring types

Kitchens are priced based on an 8 unit example as shown in the images, allowances have been made to include appliances, sinks, taps, worktops, and decorative end panels - providing a complete kitchen
Matt finish, high gloss or oak effect kitchen
Select a kitchen type

Select from 3 bathroom finishes
Standard - up-to 15% of the wall area tiled, suite to include bath, basin and toilet with a laminate floor finish

Mid-range - up-to 30% of the wall area tiled, suite to include bath with shower head, basin and toilet with a laminate floor finish

Premium - up-to 80% of the wall area tiled suite to include bath with shower head or complete shower unit, basin unit and toilet with a tiled floor finish
Standard, mid-range or premium bathroom finish
Bathroom Finish

Select your window style and quantities
Select how many windows are required for the extension
White, grey or oak effect upvc windows
Window Styles

Select a door type and style
How many doors are required
Select a door colour to match your existing property
Single, patio, French or bi-fold doors
Door types to choose from
Door colours, white, grey or oak effect
Door Colours to choose from

Please state if there is access to the working area - via an outdoor side gate or outdoor rear entrance, both outdoor side and rear access or no access meaning the only access would be through the actual house
Side access, rear access, side & rear access or no access
Access to the working area

Total : £

Total plus VAT : £


This quotation also includes:
✓ Architectural Plans
✓ Planning Permission Costs

✓ Building Regulations Approval
✓ Structural Calculations

✓ Materials
✓ Labour

✓ Plant
✓ Waste removal


Already have building plans and planning permission?
Then we'll deduct the cost from the quote - contact us for more information.

Happy with your quotation?
If you're happy with your quotation, select your ideal booking date to start planning your new house extension. Once you place your booking... a copy of your quotation will be sent to you via email along with further instructions and details.


Advanced New Builds



Foundations Disclaimer All quotations are based on foundations being 1m depth (one metre depth). With standard drainage for a rain water soak-away. Any need for foundations more then 1m depth may include an additional charge to cover the additional disposal of soil, concrete and labour time. A good indicator for the need of foundations more then 1m depth are trees close to the digging area. Close being within 5m of the building.