Home Extensions: Key build programme information and timeline.


Obviously a key question from clients when we discuss a potential extension project is an indication of what the time-lines might be – how long will my new extension take?

For sure, no two extension projects are the same, and it all depends on the size and design and styling of the planned extension. Also, weather can,, of course be a factor at certain times of the year.


We at Mint are always able to offer a considered clear time-line to our clients for a planned extension. This equally applies for refurbishment and refitting projects. As a business, we pride ourselves on our forward planning in order to be sure wherever possible to deliver our projects when we say we will .


Below is an example time-line for an extension –this from Grant Seddon – on the Velux blog. We think this schedule neatly sets out the key milestones in a typical extension project, the order things are likely to happen in, and an approximation of when they might take place. Not set in stone – but a fair indication!

key periods

We at Mint, as indicated, will be able to provide a specific time-line for your project which will help highlight key periods where major decisions have to be made on your part, or when disruption to your daily routine is likely to take place!

extra floor

As a rule of thumb perhaps, a two storey extension would tend to take between three and five weeks longer than a single floor project due to extra floor structure, additional wall construction and extra works relating to plastering, plumbing, electrics and decoration. Below is a specimen Calendar which gives a useful indication of progress diaried time-line on a two storey extension.

Week 1

Set out. Dig out footings. Pour concrete foundations. First delivery of materials.

Week 2

Build substructure up to damp-proof course. Install/adjust external drainage routes (where appropriate). Install damp-proof course. Pour concrete over-site/floor structure. Erect scaffolding.

Week 3

Commence construction of exterior walls.

Week 4

Commence construction of interior walls. Complete construction of exterior walls.

Week 5

Install roof structure and begin covering. Complete instruction of interior walls.

Week 6

Install windows and doors.

Week 7

Install/adjust interior drainage (where appropriate). First fix electrics and plumbing. First fix carpentry

Week 8

Break through to existing house including installation of steels. Make good all works as a result of breaking through.

Week 9

Plasterboard and plaster to all areas.

Week 10

Second fix electrics. Second fix plumbing (where appropriate). Install flooring

Week 11

Complete external works – paving, gardening etc. Install skirting. Commence decorating.

Week 12

Complete decoration. Clean down and remove all waste. Carry out snagging.

Week 13

Final inspection. Handover.

If you are planning an extension Mint Builders is always available to advise, guide and assist in all respects – including offered a hopefully accurate time-line for completion.

Refurbishment, improvement and extension – Mint offers a full extension development and finishing service to add value to your home.

Request your ‘Extend Instead’ review or quotation, visit www.mintbuilders.co.uk

Contact Mint Builders on 01242 279739 or email info@mintbuilders.co.uk