What we do

Three trades. One address.

Building, installation and residents' property management from one company at 35 Haymarket. Below: what each involves, how we charge, and what we'd rather you asked someone else for.

Build · SIC 41202

Domestic construction

Houses, small apartment buildings, extensions and conversions, built to your architect's and engineer's drawings by a team that will still be around when the building is ten years old.

We price from the drawings, not from a walk round with a notebook. The quote is itemised by element — substructure, structure, envelope, roof — so you can see where the money goes and what changes if you change your mind. On site, Building Control is booked at foundations, damp-proof course, structure and completion, and the neighbours get dates, hours and a phone number before the first delivery.

What we build

  • New-build houses and small apartment buildings
  • Rear, side and wrap-around extensions
  • Loft conversions and mansards
  • Whole-house refurbishment and remodelling
  • Structural alterations to the engineer's design
  • Basements, with a specialist partner

Good to know

  • Party Wall Act notices go out before we start — we'll tell you which ones you need
  • New homes now get heat pumps, not gas boilers, under the Future Homes Standard; we build for it from the footings up
  • Planning and design stay with your architect; we price from their drawings and flag anything that won't build
  • Every hidden element is photographed before it's covered up — the photo set comes with the building
2.7 m2.7 m2.55 m 8.4 m internal 0.6 TIMBER JOISTS 220 × 47 @ 400 C/C RAFTERS 35° · NATURAL SLATE · 300 MM INSULATION DPC 150 ABOVE GL CAVITY WALL300 · FULL FILL STRIP FOOTINGS 600 × 225 · GROUND SLAB 150 ON 150 HARDCORE BLACKSTONE STAY MANAGEMENT LTD35 HAYMARKET · LONDON SW1Y 4HASECTION A–A · NEW-BUILD TOWNHOUSEFOR INFORMATION · 2026NOT TO SCALEDWG BS-101 · REV A
Section A–A · new-build townhouseBS-101

Fit · SIC 43290

Installation & fit-out

Everything that goes into a building after the shell — heating, hot water, electrics, ventilation, kitchens, bathrooms — installed by the people who know where every joist and lintel is.

First fix is where most buildings go wrong quietly: a pipe run that can't be reached, a cable buried without a map, a fan that vents into the loft. Because we built the shell, we know what's behind every wall — and because we'll be managing the building, we'd rather not have to open it again. Each installation is commissioned, certificated and photographed, and the certificates go in the building's folder on handover.

What we install

  • Heat pumps, cylinders, boilers and underfloor heating
  • Full rewires, consumer units, lighting and data
  • Kitchens and bathrooms, first fix to silicone
  • Ventilation, MVHR, extract and ducting
  • Insulation, acoustic linings and dry-lining
  • Intercoms, access control and EV charging

Good to know

  • Gas, electrical and unvented hot-water work is signed off by registered installers; the certificates are lodged with Building Control and copied to you
  • Commissioning sheets for heating and ventilation are part of the handover, not an extra
  • We'll install into a building someone else built — after a look at what's already in the walls
  • Smart-home kit is welcome, as long as the light switches still work when the Wi-Fi doesn't
CONSUMER UNIT SWITCH CYLINDER 210 L EXTRACT 45012002400 PART P · BS 7671 (18TH ED.) · G3 UNVENTED · WATER REGS · TESTED & CERTIFIED PENDANT WORKTOP 900 AFL BLACKSTONE STAY MANAGEMENT LTD35 HAYMARKET · LONDON SW1Y 4HAELEVATION · SERVICES WALL, KITCHENFOR INFORMATION · 2026NOT TO SCALEDWG BS-204 · REV A
Elevation · services wall, kitchenBS-204

Stay · SIC 98000

Residents' property management

Once the keys are handed over, we stay: as managing agent for the buildings we build, and for blocks that need someone who reads the drawings and answers the phone.

A well-run block is mostly a calendar and a budget that people can read. Every building we manage gets a twelve-month schedule of inspections and servicing, a service charge budget itemised line by line and agreed with residents, and one number to call — in office hours, and out of them for the things that can't wait. Once a year we sit in a room with the leaseholders and go through the accounts, item by item.

What we manage

  • Service charge budgets, collection and year-end accounts
  • Repairs, planned maintenance and contractors
  • Fire risk assessments, gas, electrical and lift compliance
  • Communal cleaning, grounds, bins and cycle stores
  • Buildings insurance, renewals and claims
  • AGMs, Section 20 consultations and residents' communication

Good to know

  • Leaseholders' money sits in a ring-fenced client account, reconciled monthly
  • The out-of-hours line is for genuine emergencies — water, power, security, fire — and is given to every resident at handover
  • We take on blocks built by others after a full inspection and a read of the lease; if it isn't right for us, we'll say so after the first visit
  • Fees are a flat amount per flat per year, stated on every budget — not a percentage of the spend
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC SERVICE CHARGE BUDGETFIRE RISK ASSESSMENTBUILDINGS INSURANCEGAS & LIFT · ANNUALAGM · ACCOUNTSROOF & GUTTERSHEATING ON · SERVICEEICR · EMERGENCY LIGHTSYEAR-TWO BUDGET YEAR ONEMANAGED BUILDING · 6 FLATSONE CALENDAR · ONE NUMBER TO CALL BLACKSTONE STAY MANAGEMENT LTD35 HAYMARKET · LONDON SW1Y 4HACOMPLIANCE & MAINTENANCE CALENDARFOR INFORMATION · 2026NOT TO SCALEDWG BS-301 · REV A
Year one · compliance & maintenance calendarBS-301

How we charge

Priced from the drawings, stated on the page.

Three ways of charging, one rule: you should be able to see the number before you commit to it.

  • Building & fit-out

    A fixed, itemised price

    Priced by element from your drawings. Staged payments against work finished and inspected, never against the calendar. Changes are priced before they're built, in writing.

  • Management

    A flat fee per flat, per year

    Agreed in advance and shown on every service charge budget. It doesn't rise because the roof needed work. Contractors are instructed at cost, with quotes you can see.

  • Visits & proposals

    The first look is on us

    Inside our usual patch, the site visit and the written proposal are free. Further out, we'll tell you before we set off whether there's a charge.

What we don't do

Sales, lettings and valuations — that's an estate agent's job. Commercial, retail and industrial work. Planning and design, which stay with your architect. And taking on a block we haven't walked through with the drawings in hand.

Talk to us

Send us the drawings, or the address.

A build, a fit-out or a block to manage — the first conversation is the same. Tell us what you've got and we'll come and look.