House Extensions Loughton
Single storey rear and double storey extensions in Loughton, planning, structure and build under one contract.
- Rated 4.9 from 31 reviews on MyBuilder
- Guide from £40,000 (London-derived)
- Free site survey, itemised quote
An extension puts a planning route, a building control route and a foundation design on the same programme, and they do not run to the same timetable. We appoint the structural engineer, build to their calculations, and coordinate the building control application and inspections with Epping Forest District Council.
For Loughton, on London-derived ranges a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m²; Essex work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Loughton: the structural engineer we appoint designs the structure, we build it, and building control signs it off.
Price guide
| Work | Indicative range |
|---|---|
| Single-storey rear extension | from £40,000 |
| Rear extension, per m² | £2,000 to £2,800 |
| Side return, per m² | £2,400 to £3,200 |
| Wraparound, per m² | £2,400 to £3,200 |
| Double storey, per m² | £1,800 to £2,600 |
| Basement extension | see the basement page |
Indicative London ranges (Architecture for London, Resi, MyBuilder and Checkatrade, 2026), not a quotation. Essex work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: Extension Costs & Planning.
Quick estimate for Loughton
Loughton range: choose above
Where permitted development rights have been withdrawn
Two Loughton conservation areas carry Article 4 directions, and one of them works address by address. AD02 was made on 17 August 1999 and came into force on 27 August 1999, withdrawing permitted development rights from certain dwelling houses in the York Hill Conservation Area. That direction applies to a schedule of named addresses rather than to every property in the conservation area, and the schedule covers properties in York Hill, Forest Way, Kings Hill, Pump Hill and Kings Green.
Baldwins Hill Conservation Area is not covered by either of the two Article 4 directions the council lists for Loughton. Outside the named York Hill addresses and the Staples Road frontage, a single storey rear extension on a house can often go ahead as permitted development: up to 3 metres deep on a terraced or semi-detached house, or 4 metres on a detached one, and no more than 4 metres high, with deeper single storey extensions possible through the prior approval route. Flats and maisonettes have no permitted development rights, and a side extension in a conservation area needs planning permission. Separately, Epping Forest District Council requires a street scene elevation for any householder work to the front or side of a property fronting a road, drawn to show the proposal in context with neighbouring properties as viewed from the street.
Housing in Loughton
Loughton counts roughly 14,420 homes for Council Tax; 7% are older than 1919, 17% interwar and 76% post-war, with 28% flats and 72% houses. A rear extension on a terrace in Loughton digs foundations close to both neighbours, so notices to both are normal, and 32% of homes here are terraced.
The ground your foundations go into
Loughton's geology changes over a short distance, and the foundation design follows it. British Geological Survey 1:50,000 mapping shows the Claygate Member, the sandier upper part of the London Clay, as the bedrock on the higher ground at the north of the town around Goldings Hill, Englands Lane and Forest Road, and in Epping Forest at Loughton Camp. Along the High Road and Traps Hill spine, the same mapping shows a superficial deposit of Lowestoft Formation diamicton, a glacial till, over the London Clay.
The British Geological Survey describes the Lowestoft Formation as an extensive sheet of chalky till characterised by its chalk and flint content, with a matrix carbonate content of about 30 per cent. Depth is decided by trial hole and by the engineer, not by a map. On sloping sites the council requires a cross section through the proposed building showing how it relates to existing ground levels and the adjacent level of the land.
The Roding valley: alluvium and flood zones
The eastern and southern edge of Loughton is a different foundation problem. British Geological Survey mapping shows Alluvium along the Roding valley, including at Chigwell Lane, Valley Hill, Torrington Drive, Borders Lane and the eastern end of Debden Broadway. The survey describes Alluvium as normally soft to firm consolidated, compressible silty clay, which can contain layers of silt, sand, peat and basal gravel.
Environment Agency Flood Zones 2 and 3 follow the same corridor, taking in Chigwell Lane, Valley Hill and Borders Lane. Epping Forest District Council requires a Flood Risk Assessment with a householder application in Flood Zone 2 or 3, and states that this covers sheds, garages and games rooms within the curtilage as well as physical extensions to the house itself.
Green Belt and protected trees
Two further constraints sit over an extension here. Over 90 per cent of the Epping Forest district is designated Green Belt. The council has deliberately not defined what counts as a disproportionate addition or a materially larger building, on the basis that it depends on the characteristics of the site, the locality and the existing building. That leaves the judgement with the case officer, so a pre application conversation earns its keep.
Every tree in a conservation area with a stem diameter of 75mm or more is protected, and the council requires six weeks notice before any work is carried out on one. That notice period belongs in the programme from the start, not halfway through the groundworks.
Kitchen extensions in Loughton
53% of the houses in Loughton are semi-detached or detached, which usually leaves room for a kitchen extension across the full rear width, with a steel beam over the opening into the house. The fit-out is priced on its own page, kitchen renovation in Loughton; the build figures are in the table above.
Side return extensions in Loughton
Side returns belong to Victorian and Edwardian terraces, and only 7% of homes in Loughton predate 1919, so they are the exception here; most extensions run across the full rear width instead. Our side return extension page covers the build in detail, with build rates of £2,400 to £3,200 per m².
Double storey extensions in Loughton
Under permitted development a two-storey rear extension can go no more than 3 metres beyond the original rear wall and must stay at least 7 metres from the rear boundary, and in a conservation area it is not permitted development at all. Many gardens are too short for the 7 metre rule, so a double storey extension in Loughton often needs planning permission from Epping Forest District Council. With 38% of homes here semi-detached or detached, the side of the house is often an option too. Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.
- Levels, drainage and landscaping made good around the new build
- Steel goalpost frames where the rear wall opens up
- Insulation, airtightness and thermal detailing to regulations
VOA Council Tax stock of properties, March 2025, for Loughton East, Loughton North, Loughton South and Loughton West. Counts rounded by the VOA.
Why Loughton Homeowners Choose GS Renovation
An extension is the job where the planning application, the building control application and the foundation design all have to move at once, and each has a different lead time. We appoint the structural engineer, coordinate the building control applications and inspections, and keep the trees, the levels and the ground investigation on the programme rather than in the way of it. Free no obligation quotation, fully insured, one point of contact.
- Insulation and thermal detailing to current regulations
- Free, no-obligation quotations
- Drainage diverted or built over with the right approval in place
Reviewed jobs near Loughton
1 MyBuilder review from Chigwell, with each customer's own job title:
- Require an ensuite shower room to be completely redone, Chigwell, 25 Jun 2021 (5 out of 5)
Read all 31 on our reviews page.
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
Excellent service. George's knowledge and skills are the best in the market. He knows what he is doing, does really high quality work, gives good…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
FAQ
Frequently Asked Questions about House Extensions Loughton
What is included in your house extensions price in Loughton?
A GS Renovation price for house extensions in Loughton includes everything needed to finish the work and get it signed off, within £2,000 to £2,800 per m² for a rear extension (London-derived). That covers labour, materials, the engineer's design, permitted development or a planning application to Epping Forest District Council, and making good. Anything uncertain at the IG10 property is flagged before starting rather than added later.
Does a garden room or a garage on a Staples Road plot need permission?
Where it would front Staples Road, yes. Under the Article 4 direction covering that conservation area, putting up a building, enclosure or swimming pool within the curtilage of a dwelling house needs planning permission where the structure would front the highway known as Staples Road. The same test applies to maintaining, improving or altering one. A garden building behind the house sits outside that particular test, though other limits still apply.
What has to be submitted about the trees on the site?
A plan showing all trees within or adjacent to the site, where the property is in a conservation area or the trees are protected by a Tree Preservation Order. If a tree on that plan is to be removed, or is likely to be directly affected by the works, a further report is needed. Epping Forest District Council requires an arboricultural impact assessment produced in accordance with BS 5837:2012, Trees in Relation to Design, Demolition and Construction.
Is the ground at Debden Green the same as the rest of Loughton?
No. British Geological Survey mapping shows the Boyn Hill Gravel Member, described as sand and gravel, as the superficial deposit at Debden Green in the north east corner of the parish. Elsewhere the London Clay Formation, clay, silt and sand, is the bedrock beneath the High Road, Church Hill, Traps Hill, Alderton Hill, the Debden estate and the Roding valley. Foundation depth follows a trial hole on your plot.
How quickly do you know whether the application has been accepted?
Epping Forest District Council aims to check an application within five working days of receipt. Where something is missing you then have three months to supply the required plans or documents, which sounds generous but stalls the start date while it runs. That is why the validation documents are assembled before submission rather than in answer to a letter. We keep the drawings and the supporting documents moving as one pack.
Do the neighbours have to agree before the foundations are dug?
Excavating close to a boundary or to a neighbour's foundation can engage the Party Wall etc. Act 1996, and you, as building owner, serve the notice under it, yourself or through a party wall surveyor. Loughton has 4,520 terraced houses and 3,300 semi-detached houses, and in an attached home the flank wall is shared. We are a contractor rather than a surveyor, so we flag when notice is needed, give you the drawings it relies on, and hold the programme around the timescales.
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House Extensions Near Loughton
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