Hampstead Architecture and Planning

Islington

House Refurbishment Architects in Archway

Refurbishing in Archway nearly always involves a lower ground floor, and that is where the money and the risk concentrate. A room partly below external ground level on a hillside behaves differently from the rest of the house: it gets damp from directions a flat-site property never does, and the repairs that work upstairs make it worse.

Last updated

Book an Architectural ConsultationGet your fixed-fee packageor call 020 8054 8756

The short answer

What is the hard part of refurbishing in Archway?

The lower ground floor. On a sloping site water arrives laterally through retaining walls, from above through light wells, and as condensation in a cold room — causes that look identical on the wall and need entirely different repairs. Investigate before treating, and run two moisture strategies deliberately: exclusion and drainage below ground, breathability in the solid-wall construction above, with the transition drawn rather than assumed.

Planning at a glance

Archway

Planning at a glance in Archway
Local planning authorityIslington
Likely approval routeHouseholder planning application or permitted development, depending on conservation status, listing and property type — confirmed for the exact address before drawings begin
Statutory determination time8 weeks for most householder applications (13 weeks for major applications)
Where most projects startPlanning Route Review — £395 inc. VAT, credited in full against your package if you proceed. Find my package →

Damp at lower ground floor level is the defining technical problem here, and it is usually misdiagnosed because it has more possible causes than damp upstairs. Water can arrive laterally through a wall retaining ground, from above through a defective light well or blocked gully, from below where the floor sits close to the water table, from a bridged damp-proof course where external levels have risen, or as condensation in a cold room with poor ventilation. Each has a different repair and several look identical on the wall surface.

That makes a methodical investigation worth more than a treatment quotation. Start outside and above: check whether external ground levels have risen against the wall over the years, whether the light well has a working gully that is not blocked, whether rainwater goods discharge into a drain rather than beside the wall. Then the retaining condition, then the floor, then ventilation and heating. Injecting a chemical damp-proof course addresses almost none of these, which is why proper investigation before treatment matters more here than in most housing.

Above ground the house is usually pre-1919 solid-wall construction, which needs the opposite instinct from the waterproofed level below. Solid brick in lime mortar was built to absorb and release moisture, so sealing it with cement render, gypsum plaster or vinyl paint traps water in the fabric. A refurbishment therefore runs two strategies in one building — managed exclusion below ground, breathability above — with the transition between them designed rather than assumed.

The fire strategy is the third major element and it is more demanding on these tall houses. A three-storey terrace over a lower ground floor, particularly with a converted loft, needs a fully protected escape route from the top storey to a final exit: an enclosed fire-resisting stair, fire doors to habitable rooms opening onto it and mains-linked interconnected alarms. Houses opened up over the years frequently lack it, and reinstating it while the finishes are off costs a fraction of doing it later.

Local analysis

What matters in Archway

Two moisture strategies in one house

A period house on a sloping site needs opposite approaches in different parts of the same building, and the transition between them is where specifications fail. Below or against external ground level the strategy is exclusion and management: a designed waterproofing system, land drainage behind and beneath the structure to intercept water moving down through the hill, and a means of dealing with anything that gets past the first line — usually a drained cavity directing water to a maintainable sump. Above ground the strategy is breathability: solid brick in lime mortar was built to absorb and release moisture, so finishes need to be vapour-open, any suspended floor void needs its ventilation maintained rather than blocked by new terracing, and internal moisture from cooking and bathing needs mechanical extract rather than being allowed to condense on cold walls. The junction between the two zones — usually somewhere around ground floor level, and on a sloping site at different heights on different elevations — has to be detailed so a tanked lower level does not drive moisture up into breathable masonry above it, and so the damp-proof course is continuous and not bridged by internal or external levels. The commonest failure we are asked to correct is a house where one strategy was applied throughout: either tanked everywhere, with damp appearing higher up the wall, or treated as breathable throughout, with a lower level that never dries out.

What the external work will and will not need

The consent position for the outside of the house depends entirely on which borough covers the address, and the difference is stark. On the Islington side, the Article 4 directions across 40 of the borough’s 42 conservation areas specifically catch replacing external doors and windows and painting previously unpainted brickwork — so a refurbishment that touches the front elevation is a planning matter, and the assessment turns on detail: the window pattern, the material, the glazing bar arrangement, the horns and meeting rail, and how far the frame sits back from the brick face. Slim-profile double glazing in timber sashes matching the original is usually the specification that satisfies both that and the building regulations. On the Haringey side, with only four conservation areas carrying Article 4 directions, the same work may need no permission at all. On the Camden side the directions differ again, and anything involving excavation is caught by the borough-wide basement direction whatever else applies. The practical advice is the same in every case though: order nothing until the position is confirmed. Replacement windows are the single most common thing bought before the check is run and then found to be uninstallable, and repair of original joinery — where the fabric allows it — needs no permission anywhere and is frequently cheaper over the life of the building.

Thinking about a project in Archway?

Send the address and a short description. We will confirm the likely approval route and the drawings your project needs.

Book an Architectural ConsultationSee fixed-fee packagesor call 020 8054 8756

Local planning

Planning & conservation context

Internal refurbishment of a single house does not usually need planning permission, but on a Camden address any work involving excavation does: the borough-wide Article 4 direction on basement development has been in force since 1 June 2017. On the Islington side, external alterations are likely to need permission because the borough has removed permitted development rights in 40 of its 42 conservation areas.

Changing the number of dwellings is a material change of use requiring a planning application in any of the three boroughs, and the council will want evidence of the lawful existing use.

Separately from any planning question, building regulations consent covers the structural work, the drainage, the electrical installation, insulation and ventilation improvements, replacement windows and every element bearing on escape or fire separation.

On the Islington side the Article 4 directions specifically reach changes to external doors and windows and painting previously unpainted brickwork — work most people would not think of as development. That makes the external half of a refurbishment a planning matter rather than a free choice.

On stepped terraces the front elevations read as a continuous composition down the hill, with the rhythm of levels, railings, front boundary walls and lower ground floor light wells all contributing.

A garden or boundary wall on these plots is often doing two jobs at once — holding back a difference in ground level, and forming part of what a designation protects — so a repair can need consent from the council and a design from an engineer before anything is touched.

For the wider local-authority picture — policies, timescales and application routes — see planning in Islington.

Illustrative study — street elevation

Services

Architectural services in Archway

Browse all London architectural services.

Nearby

Nearby House Refurbishment Architects pages

House Refurbishments in Tufnell ParkHouse Refurbishments in HighgateHouse Refurbishments in HollowayHouse Refurbishments in Dartmouth ParkHouse Refurbishments in Crouch EndHouse Refurbishments in Islington

Architecture in Archway: FAQs

Do I need planning permission to refurbish a house in Archway?

For internal work to a single house, usually not — but any excavation on a Camden address does, under the borough-wide basement direction in force since 1 June 2017. External alterations are likely to need permission on the Islington side, where the borough has removed permitted development rights in 40 of its 42 conservation areas. Haringey restricts only four. Building regulations apply to the technical work regardless.

Why is my lower ground floor damp?

On a sloping site there are several possible causes that look alike: water arriving laterally through a retaining wall with no drainage behind it, a defective or blocked light well gully, rainwater goods discharging beside the wall, external levels raised above the damp-proof course, a floor with no membrane, or condensation in a cold poorly ventilated room. Each needs a different repair, so investigation precedes treatment.

Can I use the same damp specification throughout the house?

No, and this is where most specifications go wrong. Below or against ground level the strategy is exclusion and drainage. Above it, solid brick in lime mortar needs breathability — vapour-open finishes, maintained sub-floor ventilation and mechanical extract. The transition between the two has to be drawn deliberately, or a tanked lower level pushes moisture up into breathable masonry above.

Can I replace the windows?

It depends on the borough. On an Islington designated address the Article 4 directions specifically catch replacing external doors and windows, so permission is needed and the detail is assessed. On a Haringey address outside its four Article 4 conservation areas, the same work may need none. Either way the building regulations apply for thermal performance, ventilation and, where relevant, escape.

What fire safety work will a tall house need?

A three-storey terrace over a lower ground floor, particularly with a converted loft, generally requires a fully protected escape route from the top storey to a final exit: an enclosed fire-resisting stair, fire doors to every habitable room opening onto it and mains-linked interconnected alarms. Houses opened up over the years often lack it, and doing it while the finishes are off costs far less than retrofitting.

What should I do about a bulging garden wall?

Have it assessed structurally and establish its ownership and heritage status before doing anything. Many of these walls retain ground with no drainage behind them and have been deteriorating for years. Where the wall contributes to designated character, rebuilding needs permission and must match material, coursing, coping and height — so the repair has to satisfy both engineering and conservation requirements.

Can I turn flats back into a single house?

Usually, and councils are generally receptive to restoring family housing, but it is a material change of use needing planning permission and evidence of the lawful existing use from planning history and council tax records. On these tall houses the practical work is substantial: unpicking separate supplies and services, checking openings formed during subdivision, and reinstating a protected stair enclosure through the full height.

What does a refurbishment architect in Archway cost?

We publish fixed-fee packages rather than quoting a percentage before seeing the property, starting with a route review credited against the design work if you proceed. That review establishes the borough and its directions, inspects the levels and boundary walls, and sets the moisture strategy. Structural engineering, damp investigation and council fees sit outside the architectural fee.

Discuss a refurbishment in Archway

Send your Archway address, photographs of any damp along with the external levels, light wells and boundary walls, and a note of how the house is arranged over its floors. We will confirm the borough and its directions, identify the causes rather than the symptoms, and set out the fixed-fee stage that follows.

Book an Architectural ConsultationEstimate the feesor call 020 8054 8756
Call 020 8054 8756Send Details