Builders in Hampstead NW3

Completed Projects Near Hampstead

Most firms calling themselves Hampstead builders cannot point to finished work within walking distance of the Heath. These two projects are published in full on our site, with photographs, and both are directly relevant to the housing stock you will be building in.

Extension and renovation of a three-storey Victorian flat, Belsize Park NW3

Our clients bought the ground floor flat of a Victorian house built in 1864, then later purchased the basement flat beneath it. We merged the two properties into a single family home across three levels, working with Vita Architecture on the planning application and architectural design. The scope covered structural openings between the floors, a full re-plan of the layout, a new kitchen built around our clients' love of cooking, complete with wine storage, and a basement cinema room fitted with an 85-inch screen, a Denon amplifier and in-wall speakers. You can see the finished rooms on the Belsize Park renovation case study.

A flat merge and whole-property renovation of this scale typically spends eight to twelve months on site. Budgets for this class of work in Camden typically start from £2,500 per square metre and rise to £3,200 to £5,000 per square metre at prime specification, driven mainly by finishes, joinery and structural complexity.

Renovation inside Highpoint I, a Grade I listed building in Highgate

Highpoint I, completed in the 1930s to Berthold Lubetkin's design with structural engineering by Ove Arup, is one of the most protected residential buildings in Britain. Renovating a flat there meant listed building consent and months of preparation before anyone lifted a tool. We preserved the original taps, towel hangers, cabinets and countertops, protected the historic tiles with bespoke techniques, and rebuilt wall finishes using a breathable lime substrate under Moroccan tadelakt, alongside new Carrara marble in the bathroom. The full photo record is on the Highpoint I Grade I listed renovation page.

Heritage work at this level typically prices 20 to 30 percent above standard renovation rates, reflecting specialist trades, conservation materials and the slower, consent-led programme. If your Hampstead property is listed, or you suspect it is, this project is the clearest evidence we can offer that your building will be treated properly.

On Site in NW3: Current and Recent Work

Alongside the published case studies, our teams have progressed a run of substantial NW3 projects between 2023 and 2026. As of August 2026, work in the area has included:

• Excavating a basement swimming pool beneath an existing building, with the additional reporting Camden requires for excavation under standing structures.
• Merging a basement and ground floor flat opening onto an unusually large garden, where the design adds an open-air amphitheatre in Italian marble and a music room whose glass doors open onto marble steps that double as audience seating.
• Installing underfloor heating throughout a property, with new engineered timber flooring imported from Europe in extra-long planks, distressed and stained in the UK, then acclimatised in the finished rooms before laying.
• Redesigning the layout of a large house to meet new accessibility and mobility requirements, re-planning circulation and level changes so the owners can stay in the home they love.

We mention these because Hampstead clients rightly ask what a builder is doing in the area now, not just what they finished years ago. Ask us on a site visit and, where clients permit, we will show you.

Hampstead's Housing Stock, and Why It Shapes Your Build

Choosing builders in Hampstead is different from choosing builders almost anywhere else in London, because the buildings themselves are different. The village core around Church Row, Flask Walk and Well Walk is Georgian and early Victorian, with narrow lanes, stepped streets and tight rear gardens that make access, deliveries and waste removal a logistical discipline in their own right. The avenues of Fitzjohns and Netherhall hold vast red-brick Victorian villas, many long since divided into flats, where structural alterations touch shared freeholds and party structures. Belsize Park and South Hampstead add stucco terraces and Edwardian mansion blocks, and the area around the Heath carries an internationally significant modernist legacy, from Erno Goldfinger's house at 2 Willow Road to Lubetkin's Highpoint towers on the Highgate ridge, where we have worked under Grade I constraints.

Each of these building types fails in different ways and rewards different construction methods. Solid-wall Georgian and Victorian fabric needs breathable materials rather than modern cement renders and sealed systems. Mansion block work lives or dies on logistics, protection of common parts and relations with the managing agent. Modernist concrete needs specialist repair and honest respect for original detail. A builder who treats all of NW3 as identical brick terraces will produce quotes that look cheap and projects that go wrong. Our estimates are built around the specific construction of your property, which is one reason we insist on visiting before we price anything.

The practical side matters too. Much of Hampstead requires parking suspensions and skip licences from Camden, some lanes cannot take a large delivery vehicle at all, and several of our NW3 projects have needed materials broken down into smaller loads or craned over the building. We plan this in the programme from day one rather than discovering it in week three.

Loft Conversions in Hampstead

Roof development is one of the most requested projects in NW3, from rear dormers on Victorian terraces to full mansard rebuilds and roof terraces on top floor flats. The catch is that much of Hampstead sits inside conservation areas where permitted development rights are restricted or removed, so a conversion that would be automatic elsewhere in London needs a considered planning application here. We run early feasibility checks on head height, roof structure and planning history before you spend money on design. Our clients who live abroad for part of the year often choose a secure roof garden over a conventional terrace. For conversion types, timescales and the design and build approach, see our loft conversions in London service page.

House Extensions in Hampstead

Rear and side return extensions remain the most reliable way to gain family space in NW3, and demand for larger kitchens and home offices has only grown. In Hampstead the design bar is higher than the London average: Camden expects extensions in conservation areas to respect the host building's materials, rhythm and garden setting, and neighbour amenity carries real weight at committee. Our architects design to those expectations from the first sketch rather than fighting them at appeal, which is why our approval record in the borough is strong. If you already have drawings from your own architect, we price and build those too. Start with our house extension page for the full approach.

Basement Conversions in Hampstead

Where you cannot extend outwards or upwards, digging down is often the answer, and Hampstead has some of London's most ambitious examples, including basement pools and cinema rooms excavated beneath existing houses where the council would not permit external alterations. Camden polices basements more tightly than most boroughs, so the engineering and documentation must be right first time. Our in-house structural engineers produce the impact assessments, method statements and monitoring plans the council expects, and we build with full waterproofing guarantees. Read more about the construction sequence on our basement conversion page.

House and Flat Renovation in Hampstead

Whole-house renovation in Hampstead, West Hampstead and Belsize Park consistently repays investment, whether you are upgrading a purchase, preparing to sell or simply want a new home without moving. Flat refurbishment in the area brings its own logistics: mansion blocks and converted Victorian houses mean freeholders, managing agents, licences to alter, party wall agreements, agreed working hours and method statements. We handle all of it, including neighbour liaison, so the project stays hassle free whether your flat is one of two in a converted house or one of thirty in a block. Our house renovation page sets out the stages and what drives cost.

Conservation and Listed Building Work

A large share of our Hampstead enquiries involve a listed building or a conservation area property, and this is the work we are best known for, from Grade I flats to Grade II Victorian villas. Our partner conservation architects and heritage consultants prepare the heritage statements and consent applications, and our trades are comfortable with lime plasters, sash window repair, historic tile preservation and the other skills this stock demands. If your project needs that level of care, our conservation architects page explains how the design side works.

Planning in Hampstead: What Camden Council Expects

Camden Council is the planning authority for Hampstead, and it operates one of the most extensive conservation frameworks in London: around 40 conservation areas covering more than half the borough. In NW3 the ones you are most likely to live in are:

• Hampstead Conservation Area, covering the historic village core, where Article 4 directions remove many permitted development rights and even window and boundary changes can need permission.
• Redington Frognal, the leafy grid west of Finchley Road, which also has its own adopted neighbourhood plan adding locally specific design policies on top of Camden's.
• Fitzjohns Netherhall, the avenue of large red-brick Victorian houses between Hampstead village and Swiss Cottage, where scale and roofline changes are scrutinised closely.

Four practical consequences follow. First, assume a planning application rather than permitted development until a check proves otherwise; a householder application currently carries a statutory fee of £548, and a lawful development certificate, which we often recommend even where works are permitted, costs £274. Second, if your building is listed, listed building consent is required for internal as well as external alterations, and starting without it is a criminal offence; our Highpoint I project shows what a properly consented programme looks like. Third, Camden's basement policy in its Local Plan limits new basements to a single storey in most circumstances, restricts excavation to no more than half of the garden, and requires a Basement Impact Assessment covering ground conditions, hydrology and structural effects on neighbouring buildings. Fourth, trees are protected here in a way many owners do not expect: works to trees in a conservation area need six weeks' written notice to the council, and mature gardens in Frognal or Redington can constrain both basement footprints and extension positions.

None of this should put you off. Our experience is that Camden responds well to high-quality, well-argued proposals, and the borough's openness to innovative design is precisely why Hampstead's architecture is so varied. We have obtained permissions in conservation areas that clients had assumed were impossible, usually by investing in the heritage argument early: a thorough design and access statement, materials that answer the conservation officer's likely objections before they are raised, and pre-application advice where the scheme is ambitious. When a project also involves neighbours, as most NW3 projects do, we prepare party wall notices in parallel with planning so the two consent tracks do not stack end to end and stretch your programme.

How much do builders cost in Hampstead?

These are the bands we publish from our own London projects, not scraped industry averages. Hampstead sits at the prime end of the market, so expect outcomes in the middle to upper part of each range once conservation constraints and finish levels are factored in.

Project type in Hampstead	Typical cost
Full house or flat renovation	From £2,500 per sqm; £3,200 to £5,000 per sqm at prime specification
Loft conversion (build cost)	£3,000 to £4,500 per sqm
Dormer loft conversion	£50,000 to £90,000; high-specification prime projects £90,000 to £160,000
Mansard loft conversion	Typically from £130,000; bespoke prime projects £130,000 to £210,000 or more
Basement conversion	£5,000 to £6,000 per sqm

Listed buildings and conservation area properties typically add 20 to 30 percent through specialist trades and materials. Professional fees, VAT and statutory costs sit on top of build cost, and basement figures move with excavation depth and access. For a fuller breakdown of what drives loft pricing in the capital, our loft conversion cost guide is updated for 2026.

In Hampstead specifically, four factors move a project between the bottom and top of these bands more than any others:

• Access and logistics. Restricted streets, parking suspensions and hand-carried or craned materials add labour hours that a builder pricing off plans alone will miss.
• Heritage fabric. Lime plasters, sash window joinery, matching brick and preserved original features cost more per square metre than modern equivalents, and rightly so.
• Below-ground risk. Hampstead's slopes and water-bearing ground make basement engineering, waterproofing and monitoring a bigger share of cost than in flatter boroughs.
• Finish level. The gap between a rental-grade finish and the bespoke joinery, stone and lighting most NW3 clients actually want is the single largest swing in any quote.

For anything beyond a ballpark, the honest answer is a site visit. Every quote we issue is itemised line by line, with materials, labour and programme set out, so you can see exactly what you are paying for and compare us fairly against other Hampstead builders. We would rather lose a job on a transparent price than win one on an optimistic estimate that unravels mid-build.

Why Hampstead Homeowners Choose houseUP

We have completed more than 150 projects across London over more than a decade, and North London has been a core of that work throughout. Three things matter most to the Hampstead clients who hire us. Accountability: one project manager owns your build from survey to snagging, with no handoffs between contractors. Engineering depth: structural engineers on staff means basement schemes, flat merges and load-bearing alterations are designed and checked in house, and creative structural design has cut serious money from clients' projects. Communication: a dedicated Slack channel, regular photo and video updates from site, and direct access to your project manager, so you always know where the budget and programme stand. Add the conservation record evidenced above and you have a builder genuinely matched to what NW3 property demands.

How a Hampstead Project Starts

Everything begins with a free site visit from someone who knows the area, followed by an introduction to a designer with Camden experience, a design proposal covering planning where needed, then a detailed estimate before any commitment. During construction we assign trades who have worked in Hampstead's housing stock before, and every project closes with a retention period, guarantees and the full certificate pack. The stages are set out in detail further down this page.

Where We Work Around Hampstead

We are not a one-postcode outfit pretending to be local everywhere, so here is the honest picture: we work across North London from our Covent Garden office, and NW3 and its neighbours are where our recent project density genuinely sits. That means Hampstead village, Belsize Park, Frognal, West Hampstead and South Hampstead in NW6, Primrose Hill, and across the Heath to Highgate, where the Highpoint project stands. West Hampstead, Haverstock Hill and the streets around Parliament Hill are areas where we have completed flat and house refurbishments, and Golders Green and Kentish Town sit comfortably within our working radius. If your property is further out, ask anyway; the answer depends on the project, not a line on a map, and we will tell you straight if another firm is better placed.

Book a Free Site Visit in Hampstead

If you are planning building work in Hampstead, Belsize Park, West Hampstead or Highgate, the quickest way to move forward is a conversation at the property. We will assess feasibility, flag any planning constraints and follow up with an itemised estimate, all without obligation. Get in touch to arrange your free site visit.