You’re thinking of embarking on a major project so you will have lots of questions about garden rooms and building regulations. Here are some of the most common questions we are asked.

Please get in touch with us if you have any further questions.

Arranging a Visit

Can I arrange for Marston & Langinger to visit me?

Of course, please give us a call on 01243 214550.

Examples of Work

Where can I see examples of your work?

We have a number of display structures at our manufacturing base in Hampshire, together with our design studio and modern production facility.

Planning and Building Regulations

Will I need building regulations for a garden room?

If your planned garden room is over 30sqm and/or open to the house (i.e. there are no doors between the house and the new structure),  or if the garden room is on the first floor or over 4.0m high to the eaves, it will need building regulations.

Please get in touch for further advice.

Will I need planning permission for a garden room?

Adding a garden room to your house is often considered a permitted development, even within designated zones such as conservation areas and AONB.

Planning Portal is a good source of information and will give you up to date guidance regarding planning. Should your particular circumstances require a stand-alone application to be made, Marston & Langinger does offer a planning service; we can submit a householder’s application on your behalf.

Listed consent will also be needed if the garden room is to be attached to a listed dwelling. However, it’s not necessarily required if the structure is to be a freestanding garden room within the grounds of a listed dwelling.

When it comes to planning, Marston & Langinger have a wealth of experience. Our team of designers work with planning authorities across the UK and can work with you or your own architect to facilitate this process.

Size & Shape

Can I have a garden room any shape I want?

The sky’s the limit! We view every project with an open mind and work with you in creating a bespoke design.

Aluminium & Paint

What sets Marston and Langinger apart from other aluminium garden rooms?

We combine decades of experience in building beautiful, classic garden room design and craftsmanship with the use of high-tech materials, including aluminium. Our association with Alitex greenhouses has provided us with an extensive understanding of aluminium and glass structures.

What are the advantages of aluminium?

Aluminium doors and windows have weather test ratings, as do timber products. The main advantage of aluminium is that it maintains its initial weather integrity over the entire course of its lifetime, whereas timber won’t.

Our windows and doors meet BS6375:pt1 severe exposure category 2000. You can see all the British Standards that we build to here. You will also benefit from reduced maintenance. A regular wash is all that is needed rather than re-paints.

Finally, aluminium provides reduced expansion and contraction, which causes warping in timber, affecting its weathertight quality in the long term.

What is the heat retention of aluminium?

As a material, modern aluminium meets all criteria for ‘U-Value’ standards. Thermally broken aluminium frames are used extensively throughout the UK for windows, doors and roofing systems. It is the preferred choice of many industry experts, as the material is being widely recognised as the ideal solution for glazed structures.

Do aluminium garden rooms suffer from condensation?

Our system is fully thermally broken; the inside face of the aluminium is separated from the outside face by a polyamide, plastic thermal break. As with all glazed structures which are prominently glass, condensation must be managed through appropriate heating and ventilation.

Can I have my garden room any colour?

Yes. We have the entire international RAL palette available to us and can even create special mixes to match existing paintwork. We also offer dual colour (where you can have a different frame colour inside and out) as well as metallic and textured finishes.

Replacement Windows and Doors

My existing double glazing is starting to fail. Do you do replacement doors and windows?

As a general rule we are unable to supply just doubled glazed units. However, we have often replaced additional windows and doors whilst undertaking the installation of new glazed structures.

Product Specification

What is the u-value of your double glazing?

The u-value of our windows is 1.6 W/m2K and on our doors it is 1.8 W/m2K (with a centre pane u-value of 1.2 W/m2K).

Can you do solar control or self-cleaning glass?

Yes. There are many options and we would suggest it is best debated with your designer who will consider your specific requirements.

What kind of glass do you use?

We use “low-e” (short for “low-emissivity”) glass. Our standard double glazed units have a 4mm toughened outer pane, a 14/16mm air gap and a 4mm toughened inner pane. In the roof the inner pane is 6.4mm laminated glass. This will remain in situ, should the outer pane be broken. The air gap is argon filled to increase the thermal efficiency of the double glazed unit. There are alternatives available.

Do you use safety glass?

Yes – within our structures, all glazing is to Part N of building regulations, which is a compulsory safety standard. We use toughened glass inside and out on all doors and windows, with a laminated inner pane in the roof for ultimate safety.


How secure is the conservatory?

We fit high security concealed shoot bolts on all doors and opening windows. Our windows and doors comply with British Standards (BS7950).

Automatic roof vents (if fitted with rain sensor and/or temperature controlled) are fitted with a manual over-ride so they can be left closed when the house is unattended.

Enquiries from Abroad

Do you provide conservatories abroad?

We do supply throughout Europe, please get in touch with us to discuss your requirements and location.

Costs & Timings

How much will it cost?

This very much depends on the nature of the design. However as a very rough guide, £2,500 excluding VAT per sqm should be allowed for the aluminium and glass framework. This includes delivery and installation but not the preparation of the walls and floor.

What is your lead time?

Typically around 16-20 weeks from confirmation of order – this very much depends on the final design whilst some projects may be turned around quicker.