The reported build cost for this Hackney terrace was £353,050, before VAT. That is a substantial number, but it cannot tell you how much cash you would need to reproduce the finished home. It belongs to one renovation begun in March 2022, not a quotation for a project starting now.

The house is Burgundy Lanes, a 1960s end-terrace reworked by Nimtim Architects for Graeme Bulcraig. The most revealing detail is a timber screen running through the interior. Clear glass, fluted glass and solid panels allow different degrees of separation. In the rear dining space, you can see through to the sofa while still reading the two areas as distinct rooms.

The timber-and-glass screen separates dining and sitting areas while maintaining views between them. Photograph: Jim Stephenson.

I like the way the frame makes a boundary without reducing the view to a single doorway. It gives the dining table a backdrop and the sitting area an edge. A quotation for this arrangement would need to describe a designed piece of joinery, with its panels, movement and fitting, rather than merely promise an open-plan ground floor.

That distinction runs through the project. Nimtim places the kitchen inside a burgundy enclosure, with generous hatches towards the surrounding rooms. The kitchen remains visibly part of the house even when its edges are defined. Flexibility here comes from carefully constructed boundaries, not simply from removing them.

The kitchen hatch frames the working space from the dining side. The pod and its fitted kitchen are related pieces of work, whose pricing needs to be distinguished. Photograph: Jim Stephenson.

Kitchen designer HØLTE identifies a mixture of IKEA carcasses and its own bespoke cabinetry, with maple and burgundy fronts and a quartz worktop. Its project page lists £29,500 for the carcasses, HØLTE fronts and bespoke items, quartz worktop and Quooker.

It still leaves questions. The project price does not specify its VAT basis or expressly include installation, delivery, the whole appliance set or the surrounding architectural work. Nor is its relationship to the reported build total established. Adding £29,500 to £353,050 would risk counting the same work twice; assuming it covers a complete fitted kitchen would risk leaving work out.

The photograph helps explain why. The hatch's broad surround, the glazed screen beside it and the cabinetry inside meet in one view. They could appear in different suppliers' quotations. Before comparing a hybrid kitchen with a wholly bespoke alternative, draw the boundary around the finished result you want, including the joins between packages.

Jennifer Grimble's Homebuilding & Renovating report, published on 6 March 2026, describes a rear extension, loft conversion and full renovation completed in eight months. Its numbers, alongside HØLTE's own project figure, need to stay in separate columns of the story.

The missing final account matters. Until the tax basis and inclusions are clear, these figures cannot be combined into a reliable all-in cost. For your own budget, keep purchase, building work, separately bought items, professional services and tax visible.

The reported loft proposal was refused and revised before permission was obtained. Later, an underground service discovered during excavation required another change to the extension. The account supplies no separate cost for either event, so neither can be assigned a share of an alleged overspend.

The completed rear extension and loft, viewed from the garden. Photograph: Jim Stephenson.

For another homeowner, the financial consequence is about when to compare tenders. A price based on an earlier drawing may buy a different building. Give each contractor the same dated design and specification, then ask which ground conditions and existing services the price assumes. An unresolved risk needs a named investigation, allowance or agreed pricing process; an empty box is not a zero.

This was an English project. Planning, building-control and any neighbour-related requirements must be checked for your site and UK nation. RICS warns against assuming that a neighbouring loft conversion establishes permission for your own. A surveyor or other suitably qualified adviser can help define the investigations and professional services that belong in the budget.

For a scheme like Burgundy Lanes, I would put the following questions beside every quotation. The aim is a price for the same usable rooms, with an explicit owner for every piece of work.

GOV.UK says most building work on houses and flats is subject to 20% VAT, with exceptions. Ask the contractor to state the treatment that applies and obtain advice where eligibility is uncertain. Applying one assumed rate to every number in a magazine feature would not reconstruct this owner's invoices.

The Federation of Master Builders recommends a written contract with clear inclusions, exclusions and payment stages, and pricing changes before they are carried out. Its budgeting guidance also separates a contingency for unforeseen work from optional upgrades. Those disciplines matter more than finding a pleasingly round headline budget.

To compare offers, start with each quoted sum and add only the necessary exclusions and taxes that are not already included. Add your separately commissioned services and purchases once, then keep a funded contingency outside the committed spend. If a significant exclusion cannot yet be priced, the comparison is unfinished.

I would pause before committing if the quoted work leaves too little money for known exclusions or a credible allowance for unresolved risks. Resolve the missing prices, reduce the scope or obtain another properly specified quotation. A cheaper finish cannot make an unknown foundation bill disappear.

Burgundy Lanes offers an attractive idea of what a renovation can achieve: rooms that connect, with the option to draw a boundary. Its financial lesson deserves the same precision. Before choosing the lower price, make sure both prices buy the same finished home.