O&S Building Services 01323 382155 Free estimate →
Property extensions

The Space You Need, Without Moving House

An extension is the biggest building job most people ever have done at home, and it is the one where having a single firm in charge matters most. Groundworks, brickwork, steel, roofing, glazing, plastering, plumbing and electrics all have to happen in the right order, and when they are done by different companies the gaps between them are where the delays and the arguments live.

O&S carries out all of it with our own team. We work for homeowners across Eastbourne, Hailsham, Hastings and the rest of East Sussex, on rear extensions, side returns, double storey extensions and the open plan kitchen and living spaces that most people are after.

We will work alongside your architect if you have one, and we can point you towards one if you do not. Either way the first step is a free visit, and a written estimate once we have seen the house.

Try it

Sketch Your Extension in a Few Seconds

Move the sliders to see how much room you would gain, and where the usual planning lines fall for a single storey rear extension.

Your house
20Square metres added
215Square feet

Usually Permitted Development

At this depth a single storey rear extension normally needs building regulations approval only, not a planning application. Conservation areas, flats and the National Park have their own rules.

A guide only, based on the national rules for single storey rear extensions to houses. We check what applies to your house at the first visit.

What is included

What the Job Covers

The parts of the work we handle ourselves, which on most jobs is all of it.

01

Single Storey Extensions

Rear, side and wrap around extensions, usually for a bigger kitchen and living space opening onto the garden.

02

Double Storey Extensions

Extra bedrooms and bathrooms above, with the structure and the roof tied properly into the existing house.

03

Groundworks and Footings

Excavation, footings, drainage and the slab, all inspected by building control as the work goes on.

04

Steelwork and Structure

Steels fitted to the engineer's design where walls are opened up between old and new.

05

Roofs and Glazing

Flat, pitched or lantern roofs, and the bifold or sliding doors that make the room.

06

First and Second Fix

Plastering, plumbing, heating and electrics, with the wiring done by our own electricians.

How it works

From the First Visit to the Last Day

The same four steps on every job, so you always know what happens next.

01

First Visit

We look at the house and the garden, and talk through what is realistic for the budget and the site.

02

Drawings and Approvals

Planning permission or permitted development, and building regulations drawings, arranged with your architect.

03

A Written Estimate

An itemised price for the whole job, so nothing is a surprise later.

04

The Build

Our own team throughout, with building control inspections at each stage and the site left tidy every day.

“The extension is only as good as the footings nobody will ever see.”
Our work

Extensions We Have Finished

Photographed on our own jobs across East Sussex. See more of our work

Common questions

Questions About Extensions

If the answer you need is not here, call Martin on 01323 382155 and ask.

Not always. Many single storey rear extensions fall within permitted development, but the rules depend on the size, the house and whether it is in a conservation area. We will tell you honestly at the first visit, and we can arrange the drawings and the application if one is needed.

A straightforward single storey extension is usually a matter of weeks rather than months, and a double storey extension longer. We give you a realistic programme at the estimate stage and keep you told as it goes.

Yes. Most rear extensions are for a bigger kitchen, and we fit the kitchen, the flooring and the electrics as part of the same job.

Yes, and we do so regularly. If you do not have one yet we can suggest people we have worked with before.

Almost always, yes. We keep the existing house sealed off from the works for as long as possible, and we agree in advance the days when the knock through happens so you can plan around them.

Yes. We arrange the building regulations application, book the inspections at each stage, and hand you the completion certificate at the end. You will need it when you come to sell.

Also worth a look

Jobs That Often Go With This One

Most projects turn into two or three of these at once, and one team doing all of them is the whole point. Every service

Where we do it

Extensions Across East Sussex

From our base in Polegate: every town on this list is a short run for the vans, and each has its own page.

Next step

Have a Job in Mind? Let Us Come and Price It.

Call Martin on 01323 382155, or send a few details and we will call you back to arrange a visit. Estimates are free and there is no obligation.

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