site stats
Conservatory Info
Conservatory Info


Conservatory Base Construction

Conservatory base construction. We have been asked many times how a conservatory base should be constructed. We have compiled a basic conservatory base construction guide which should cover the majority of cases and answer your questions.
The construction of conservatories bases is very similar to that of an extension to your house.
It is a general belief that; because a conservatory is lighter than an extension the foundation does not have to be very deep. This is not necessarily correct.
Firstly it is not possible to know precisely how deep the foundation will be until the ground is excavated and inspected for any 'made up areas' - this is where earth has been placed on existing ground.
Therefore it will be necessary to excavate a trench through this layer into load bearing ground. By doing this you will ensure that the conservatory has a good foundation base, as we expect that you do not want to wake up one morning to find your conservatory at the bottom of your garden!
Normally foundation trenches are between 650 - 1000mm deep.
The other factors which determine the foundation depth will be tree roots, drains and services.

Conservatory Base Works

Reduction of Ground Levels

The areas where your conservatory is to be built should have any hard materials removed, i.e. patio, concrete slab, etc. and any vegetation soil removed to an approximate depth of 150mm.

Excavation of Foundation Trench

Normally the foundation trenches are excavated to the following dimensions. (Ready to receive a mass concrete foundation) 450mm wide by 650/1000mm deep dependent upon ground conditions.

Existing Underground Drains

DIY Conservatory BaseWhere an existing drain punctures a foundation the foundation must be below the drain invert (bottom of drain) and a precast lintel placed above the drain so ensuring that no weight is put onto the drain.

Casting of Foundations

DIY Conservatory BaseThe foundation trench can now be concreted. A mass fill is normally used as this tends to be quicker and therefore cheaper. The concrete is normally finished 150mm below ground level.
It is always a good idea to knock 350mm x 10mm steel pins into the side of the trench at 600mm centers leveled with a spirit level so you will know when the concrete in the trench is at the correct height.


From the foundation level build up the D.P.C. level in matching brickwork to the external face and common bricks or concrete blocks to the inside skin.

Oversite and Foundation Construction

DIY Conservatory BaseBelow: 100mm Concrete slab reinforced with a 142 steel mesh on 50mm sand blinding, on 250 micron damp proof membrane on 150mm (min) well consolidated clean hardcore.

Oversite Construction with a Suspended Floor

DIY Conservatory BaseShould the ground where the conservatory is to be built drop away more than 600mm (2ft) a timer or concrete suspended floor may be more desirable and be more cost effective.
With a suspended floor air bricks must be built into the substructure to ensure subfloor ventilation is achieved.
Should the conservatory design be glass to floor the base would normally be left at this stage with a D.P.C. (damp proof course) bedded onto the external brickwork. Ready for the conservatory to be erected we would add that the brickwork and concrete are normally left to cure for approximately 5-10 days dependent upon weather conditions.

Dwarf Wall Option

From the D.P.C. level the brickwork can then be raised to the required height in cavity brickwork. Normally the cavity would be insulated with either expanded polystyrene of fiberglass to ensure a high degree of insulation to the conservatory. The 2 walls are held together with wall ties.

Specialist Foundations

In some conditions specialist foundations may be required e.g. brown filled sited (these are areas where old buildings have been demolished and a new development built, or areas where there are trees or very poor ground). All of these areas can be built upon but specialist foundations may be required such as a raft or piled foundations.
The above is a Good Working Guide only, details may vary from supplier to supplier.
Please bookmark this page so that you can return easily for more information.

Quick Quote Massive Sale 65% off

Conservatories Prices

Conservatory Info



Submit your details we will call you and discuss your conservatory requirements and get you 3 conservatory quotes from local companies ... more on conservatory quotes.



Simply click on the thumbnails to view uPVC conservatory and Hardwood conservatory designs ... more on conservatory designs.

Conservatory Building


Read up to date information on current conservatory building regulations ... more on conservatory building regulations.



Conservatory blinds may be required to shade you from the glare of the sun, and help to provide a high degree of privacy. Conservatory blind brochures, quotations and information available ... more on conservatory blinds.

Conservatory Cane


Looking for quality inexpensive conservatory furniture? Look no further Conservatory Info is the webs definitive guide for all your conservatory cane furniture requirements. More on conservatory cane furniture

Conservatory Planning


A guide to local authorities conservatory planning permission requirements ... more on conservatory planning permission

DIY Conservatories


All you wanted to know about a DIY conservatory but did not know who to ask. Lots of information on DIY conservatory designs and how to build the DIY conservatory base ... more on diy conservatories.

Conservatory Wooden


Wooden flooring for your conservatory can provide you with the perfect flooring, and will compliment any conservatory type be it an upvc or hardwood conservatory... more on conservatory wooden flooring.

Conservatory Info can find the best conservatory prices in these counties:

Conservatory Info