House Extension Charlton SE7 Between a Jacobean Village and a Working Wharf
Charlton is built on the edge of a drop. Greenwich’s own character appraisal describes the old village standing atop the Thames escarpment, where the high ground of the Blackheath plateau falls away towards the riverside marshes in a series of narrow wooded combes. The high street still follows the line of that escarpment, and the streets running north from it — Charlton Church Lane, Charlton Lane, Fairfield Grove — descend steeply towards the Thames.
The housing follows the contour. Around Charlton House itself, which is Grade I and was built between 1607 and 1612, the appraisal identifies three phases: an exceptionally important cluster of Jacobean and Carolean structures, fine Regency and early-Victorian villas, and diverse late-Victorian and early twentieth-century buildings. Move down the slope and the stock changes to solid-brick Victorian and Edwardian terraces and semis around Canberra Road, Elliscombe Road and Hornfair Road, most with a bay to the front and a two-storey rear outrigger. Higher ground to the south holds inter-war housing on wider plots.
Then, north of the railway, the ground flattens into what has been called New Charlton since the mid-1800s — glass works, rope walks, wharves, and now a regeneration area. Two very different places, one postcode, and a slope between them that decides more about a building project here than most homeowners expect.
House extension Charlton where the ground falls away
Rear extension Charlton where the garden drops
On the streets running down from The Village, gardens frequently fall away from the house rather than sitting level with it. That single fact changes the job. A rear extension on a flat plot needs a strip foundation and a floor slab; on a falling plot it may need stepped footings, a retaining structure along one or both flanks, and considerably more spoil removed from site.
None of that is difficult, but it has to be designed rather than discovered. The fall is measured at survey and the levels are set on the drawings, so the price reflects the ground you actually have. A quotation given from a photograph will not.
Prior approval Charlton outside the designation
Outside the conservation areas, much of Charlton’s Victorian and inter-war stock keeps its permitted development rights, and Greenwich’s published application lists show owners using them.
A Marlborough Lane address took the prior approval route for a single storey rear extension projecting 4.80 metres beyond the original rear wall. Others obtain a lawful development certificate to put the position beyond doubt — the document a conveyancer asks for at sale. Inside either designation it is a full application, and the two routes are worth separating before anything is drawn.
Underpinning, retaining structures and a stepped site
Where a neighbour sits lower than you, or a new foundation goes deeper than an existing one nearby, underpinning enters the conversation. It is a controlled sequence of small excavations, not a single dig, and it needs a method statement agreed before work starts.
Our structural engineers size retaining walls and foundations from the measured levels rather than from an assumption about the plot. On a stepped site that calculation is the difference between a fixed price and a variation.
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Loft conversion Charlton: the outrigger and the L-shaped dormer
Dormers that wrap the back addition
The Charlton terrace was built with a two-storey rear outrigger, and that is what the loft work here turns on. Greenwich’s lists are full of it: one Elliscombe Road application covers a rear infill extension together with a loft conversion incorporating an L-shaped dormer and rooflights; a Delafield Road application seeks main and outrigger loft extensions alongside a ground floor extension.
The L-shaped dormer wraps from the main roof round onto the outrigger, which is how these houses yield a proper room rather than a cupboard. A Swallowfield Road owner went further and extended an existing loft conversion out over the outrigger to gain a study. It is the most productive move available on this stock.
Purlins, rafters and what the roofscape will carry
A Victorian roof is a cut structure: rafters bearing on purlins, purlins bearing on party walls or struts down to a loadbearing wall below. Removing or moving a purlin to open the space transfers that load somewhere else, and the somewhere else is usually a wall that was never asked to take it.
Inside the designation there is a second test. The appraisal treats the roofscape as part of what the area is, so a dormer has to sit subordinate to the roof it occupies, set below the ridge and in with the eaves, in materials that match. Designing to that from the start is quicker than arguing about it afterwards.
Builders Charlton for designations that share no vocabulary
Charlton Village 1971: Jacobean, Carolean and Regency
Charlton Village conservation area was designated by Greenwich in 1971 and its character appraisal is unusually specific about what it protects: an exceptionally important cluster of Jacobean and Carolean structures, fine Regency and early-Victorian villas, and distinctive late-Victorian and early twentieth-century commercial, civic and residential buildings.
Being designated land strips out a set of entitlements automatically, before any local direction is considered. Extending to the side is off the table. So is cladding. So is anything that alters the roof. The one substantial thing left is building out at the back on a single floor within the stated dimensions — which is where the worthwhile space was always going to come from.
Charlton Riverside 2021: shipbreaking, wharves and barge works
Half a century later Greenwich designated a second conservation area in the same district for the opposite reason. The Charlton Riverside appraisal of March 2021 records special interest in a distinctive industrial riverside character derived from historic and current use by the boat building, shipbreaking and wharfside transportation industries.
It names a compact, quiet and secluded place of two and three storey buildings, with the historical street pattern retained and expansive views of the Thames. One designation protects a Jacobean mansion. The other protects a working river frontage. Nothing in the guidance for one transfers to the other.
Local heritage assets and the Anchor and Hope
The Riverside appraisal is worth reading before anyone proposes anything there. Most buildings in it are local heritage assets associated with riverside industry. Anchor and Hope Wharf is recorded as a maritime archaeology site of dismantled naval warships of international significance.
Cory’s Barge Works is a Victorian barge building and lighterage operation still operational today, and Derrick and Atlas Gardens is described as a rare surviving example of Edwardian social housing built for Cory’s workforce, grouped around tree-lined greens. The Anchor and Hope pub is named as a historical landmark.
House renovation Charlton on solid brick and made ground
Damp proof course, lime mortar and stock brick
The terraces on the slope are solid brick, generally London stock, laid in lime mortar with a slate or bitumen damp proof course if they have one at all. Those walls were built to let moisture pass through and evaporate, not to exclude it.
Seal them with cement render or a modern masonry coating and the water stops moving. It reappears as blown plaster and perished skirtings, usually two or three winters later. Repointing in lime, breathable finishes and dealing with ground levels at the base of the wall are slower and cost more, and they are what these houses need.
Made ground north of the railway line
Below the railway the picture changes entirely. This was glass making, rope making and wharfage for well over a century, and land used that way carries made ground — fill of uncertain depth and composition rather than undisturbed soil.
Made ground does not bear load the way natural ground does, and its depth varies across a single plot. On the low ground a site investigation before contract is worth the delay it causes, because finding out afterwards is a foundation redesign rather than an adjustment.
Party wall awards where a terrace steps downhill
A terrace on a slope steps, so your neighbour’s floor level is not yours. Excavating for a foundation lower than theirs, or cutting into the shared wall for a beam, engages the Party Wall etc. Act 1996 on both sides.
Surveyors on our staff prepare and serve those notices. Where levels differ between properties, the resulting award tends to set out monitoring alongside the method. Interior design joins once the structure is settled and partitions can still be moved.
Construction company Charlton for a site that will not sit flat
One firm, one price, one programme
Charlton owners already use designers — Greenwich’s lists carry applications from practices based on Fairfield Grove in Charlton itself, and from studios in Beckenham and Kennington. Drawings on their own are not the difficulty.
The difficulty is the join. A design produced without levels, a structural scheme produced without the design, and a builder pricing both after the fact is how a sloping site becomes expensive. Inside one construction company the survey, the drawings and the calculations happen together, and the figure holds.
Everyone the job needs, employed here
Our architects work alongside the engineers, so nothing is drawn that the ground or the roof structure will not carry. The application is ours to prepare and pursue with Greenwich through to decision.
Party wall notices, method statements and building control all sit with the same firm, and our own trades build it. One agreement, one figure, one person accountable from the first visit to handover.
Area We Cover
Send us the SE7 address
Give us the address and an outline of the work. Back comes a note of which designation reaches you if either does, what the national rules still permit, how the ground falls across the plot, what the roof structure will take, and whether a site investigation is worth doing before contract.
We cover Charlton and the wider SE7 area — The Village, Charlton Church Lane, Elliscombe Road, Canberra Road, Hornfair Road, Fairfield Grove, Marlborough Lane and the Riverside — together with Greenwich, Woolwich, Blackheath, Eltham and the surrounding SE districts.
Surveys are free. On ground like this, ours begins with a level.
