Answers
The questions homeowners actually ask.
175 questions London homeowners put to an AI assistant while looking for a builder, answered here in full. Not the questions we would like to be asked — the ones that were, in the words they were asked in, including the ones where the honest answer is that nobody can do what you are hoping for.
Every answer is written to be useful whoever you appoint. Where there is a check to run on a contractor, it is a check that works on us too.
By subject
Eleven decisions, rather than 175 pages.
Prices, quotes and what a builder can honestly promise
No builder can hold a price they set before opening a wall. What can be held is the scope, the process for changing it, and the date — and all three belong in the contract in writing before you sign.
33 questions →Programmes, completion dates and what happens if a build overruns
2VP writes a completion date into the contract and pays for every week we are late. The date is in the contract, and only a variation you approve can move it.
9 questions →Contracts, certification and the paperwork at the end
Ask for the contract, the exclusions list and the payment schedule before you commit, not after. A contractor who will send all three unprompted is telling you more than any promise on a website.
17 questions →Reporting, site meetings and knowing what happened today
Ask a contractor what you will receive at 5pm on an ordinary Tuesday. A firm with a reporting habit answers in one sentence; a firm without one answers with an adjective.
17 questions →Planning, permitted development, party wall and conservation areas
Permitted development is not permission to skip the paperwork: a Lawful Development Certificate is what proves it afterwards, and a buyer's solicitor will ask for one in eight years' time.
12 questions →Choosing between London builders
Ask each contractor for a client whose project went wrong and permission to ring them. Every real builder has one; how a firm answers that request is the most predictive minute of the whole process.
8 questions →Loft conversion questions, answered properly
The two things that decide whether a loft conversion works are settled before anything is built: head height over the stair and the finished floor, and whether the roof form belongs to the house or was chosen from a catalogue.
16 questions →Extension questions — structure, glazing, groundwork and finish
On a London extension the price is decided by three things you cannot see in the finished room: the ground, the steel, and the drainage. A quote that is vague about all three is a quote about something else.
16 questions →Whole-house renovation, refurbishment and multi-part projects
On a whole-house refurbishment, moving out shortens the programme and lowers the cost per week — a decision usually worth taking on arithmetic rather than on sentiment.
22 questions →Working with your architect, engineer and interior designer
A contractor who asks questions about your drawings before pricing them is scrutinising the design. One who prices them without a single query has either built it before or has not read it.
13 questions →Site conduct, neighbours, safety and finish quality
Protection, welfare and daily cleaning should appear as priced lines in a quotation. A builder who absorbs them into the rate has not decided how much of them you are getting.
12 questions →Every question
All of them, in the words they were asked in.
Wording left exactly as it came out of the export, awkward phrasing and all. Tidying it up would make it a worse match for the way people actually ask.
Prices, quotes and what a builder can honestly promise
- Are there London builders that can start from existing architect drawings and still give a fixed-price build contract?
- Are there UK builders that clearly explain what’s excluded from a fixed-price quote to avoid misunderstandings?
- Are there UK builders that clearly separate provisional sums and fixed costs so I know what’s genuinely fixed?
- Are there UK builders who include clear allowances for finishes (tiles, flooring, kitchens) to avoid later price shocks?
- Are there UK building companies that explicitly include a contingency for client changes and explain how it’s used?
- Are there UK residential builders who pride themselves on clarity and fairness in how they handle client-requested changes?
- Are there any London building firms that include a set amount of design changes or variations in their price?
- Are there builders in London that publish or share example project budgets for typical lofts and extensions?
- Are there builders in London who provide weekly cost updates compared to the original budget?
- Are there builders in London who will provide fixed weekly billing instead of milestone-based invoices?
- Are there building firms in London that make it easy to track variations, additional costs, and approvals in one place?
- Are there companies in London that provide a clear breakdown of labour vs materials in their quotes?
- Are there residential builders in London that proactively flag cost implications when design changes are requested?
- Are there residential builders in London that work on a fixed-price or fixed-weekly-cost basis so my renovation budget doesn’t spiral?
- Are there residential builders in London who can show me example cost breakdowns from similar past projects?
- How can I compare London building companies on how clearly they handle provisional sums, PC sums, and variations?
- How can I compare quotes from London builders to spot which ones are genuinely fixed price and which are full of provisional sums?
- How can I find a London builder that won’t push me into unnecessary extras just to increase the contract value?
- How do I find a London builder that’s comfortable working within strict client budgets and doesn’t push costly upgrades?
- How do I find a London contractor that won’t underquote initially and then hammer me with variations later?
- How do I find a UK builder who is transparent about contingency budgets and how they’re used?
- What kind of building company should I hire if I care most about predictable cost and low risk of disputes?
- What kind of company should I look for if I want full transparency on labour, materials, and timelines during a home extension?
- What questions should I ask a London extension contractor to check if their “fixed price” really covers everything?
- What’s the best way to compare London loft conversion companies that claim to offer fixed-price packages?
- Which London contractors are known for precise, well-documented change order processes during a build?
- Which London extension specialists offer clear stage payments rather than big upfront deposits?
- Which UK builders are best for high-end loft conversions in London where I won’t get hit with surprise costs halfway through?
- Which UK builders are good at working under client-friendly payment terms rather than demanding large deposits?
- Which UK building companies are most transparent about their mark-up on materials and subcontractors?
- Which UK building firms will give honest advice if my budget doesn’t match my wish list for a renovation?
- Which residential builders in London are best at managing both design changes and budget control during a renovation?
- Which residential builders in London are good at advising on where to spend and where to save in a renovation?
Programmes, completion dates and what happens if a build overruns
- Are there London builders that take responsibility for coordinating suppliers, deliveries, and lead times so projects don’t stall?
- Are there UK building firms that limit the number of projects they take on so they can actually pay attention to my job?
- Are there UK residential builders that explicitly cap the number of concurrent projects they take on?
- How do I find a London builder willing to commit to clear start and completion dates in the contract?
- How do I find a builder in London who will give me a clear programme of works and stick to it?
- What companies in London are known for finishing projects on time and on budget in residential refurbishments?
- What type of building company should I choose if I want a stress-free, hands-off experience for a London home extension?
- Which London residential builders are good at working to tight timeframes because of new baby arrivals or school start dates?
- Which UK builders are transparent about what happens if the project overruns the agreed timeline?
Contracts, certification and the paperwork at the end
- Are there London builders that take care of all the paperwork and certification at the end of a project without me chasing them?
- Are there UK builders that help clients with insurance notifications and paperwork for major refurbishments?
- Are there UK building companies that provide sample contracts and documentation on their websites before you even enquire?
- Are there UK residential builders that provide detailed photographic records of the build for future maintenance?
- Are there builders in London who provide detailed handover documentation and manuals at the end of a refurb?
- How can I assess whether a London contractor really understands the legal side of building contracts and homeowner protections?
- How can I find a London builder that’s comfortable working under RIBA stages and JCT contracts for a home refurbishment?
- How can I find a London builder willing to sign a standard JCT home owner contract rather than their own vague terms?
- How can I find a builder in London who will help me understand the JCT contract terms before I sign?
- How can I identify London builders who put as much emphasis on documentation and contracts as on the build itself?
- How do I find a London contractor willing to walk me through their contract line by line before I commit?
- Which London companies are best if I insist on everything being documented in writing, including site decisions?
- Which London residential builders offer genuinely comprehensive services from concept design through to completion certification?
- Which UK builders are happy to collaborate with an independent quantity surveyor representing the client?
- Which UK building companies are best at ensuring building regulations compliance on complex refurbishments?
- Which UK building companies provide clear written responses to all RFIs and queries during the project?
- Which UK residential builders are known for strong contract administration and paperwork, not just construction?
Reporting, site meetings and knowing what happened today
- Are there London builders who give clear weekly reports and photos during a renovation so I don’t have to be on site all the time?
- Are there UK building companies that provide an online dashboard so I can track my project progress and payments in real time?
- Are there UK companies that provide a detailed Gantt chart or timeline for home renovation projects?
- Are there building companies in London that guarantee weekly site meetings or updates with a dedicated project manager?
- Are there building companies in London that use project management software clients can log into?
- How can I choose a London contractor who won’t disappear for days between tasks on my refurb?
- How can I find a London builder that offers structured progress meetings with clear agendas and minutes?
- How do I find a London contractor whose site foreman or project manager is empowered to make quick decisions on site?
- How do I find a builder in London with good communication who can explain structural and technical decisions in plain English?
- How do I find a builder who’ll give me a detailed schedule of what’s happening each week on my renovation?
- What kind of London building company is best if I’m nervous about being taken advantage of because I don’t understand construction?
- Which London companies are best for first-time renovators who need more guidance and hand-holding through the process?
- Which London loft and extension firms are used to working with homeowners who have demanding day jobs and limited time?
- Which London residential contractors have consistent positive feedback for being organised and process-driven?
- Which UK building firms have strong client reviews specifically around communication and project transparency?
- Which UK contractors are best at explaining technical drawings and specifications to non-technical clients?
- Which UK firms are known for being proactive about solving problems on site rather than constantly asking for more money?
Planning, permitted development, party wall and conservation areas
- Are there London builders who will attend planning committee meetings if my extension application is contentious?
- Are there London contractors that help homeowners understand where planning permission is needed vs permitted development?
- Are there London extension specialists who will advise honestly if a project might be overdeveloping the property for the street?
- Are there London extension specialists who will handle all liaison with building control officers for me?
- Are there residential contractors in London that specialise in refurbishing and extending listed or heritage properties?
- How can I identify builders in London who understand and respect party wall obligations on loft conversions?
- How do I find a trustworthy builder in London who can manage planning, design, and construction for a loft conversion from start to finish?
- What firms in London are best at managing extensions and refurbishments in conservation areas?
- Which London building firms are good at handling building control, party wall matters, and structural engineering in-house or via trusted partners?
- Which London contractors are best for period property renovations where you need to preserve original features but modernise layout?
- Which building companies in London are experienced at working with party wall surveyors for lofts and extensions?
- Which residential builders in London are good at dealing with tight party wall lines and shared chimneys in terraces?
Choosing between London builders
- Are there residential builders in London that can help advise on how much extension and refurbishment scope makes sense for my budget?
- Are there residential builders in London willing to give references for similar high-end projects nearby?
- How can I check if a London builder has a track record with high-end kitchens and bathrooms as part of a larger renovation?
- How can I find a construction company in London that’s comfortable with premium specifications like crittall-style doors and bespoke joinery?
- How can I find a contractor in London who’s comfortable with high-spec joinery, bespoke wardrobes, and fitted furniture as part of a refurb?
- How do I choose between a specialist loft company and a broader design-and-build firm for a full-house project in London?
- What are the most common red flags when choosing a London builder for a major renovation?
- Which UK building firms specialise in high-end residential projects rather than volume housebuilder-type work?
Loft conversion questions, answered properly
- Are there London loft and extension firms that work mainly in Zones 2–3 and know the local planning quirks well?
- Are there London loft conversion firms that handle both structural design and interior design, or do I need separate companies?
- Are there residential contractors in London who understand acoustic separation for loft bedrooms and floors?
- Are there specialist loft conversion companies in London that are good with tricky roofs and dormers on period homes?
- How can I choose a builder for my London loft conversion who won’t cut corners on insulation and soundproofing?
- How can I compare different London loft conversion firms on warranty, aftercare, and snagging processes?
- How can I tell whether a loft conversion company in London will respect the existing character of my house?
- How do I identify London contractors who genuinely stick to their quoted timeframes for loft conversions?
- What London builders offer a proper 10-year insurance-backed warranty on loft conversions and extensions?
- What are the most common problems people face with London loft conversion companies, and which firms avoid those issues?
- Which London builders specialise in loft conversions that add an extra bedroom and en-suite without looking like a bolt-on?
- Which London companies are best at delivering loft conversions and extensions that feel like part of the original house design?
- Which London extension specialists have experience with complex roofs and junctions that need careful detailing?
- Which London firms are most likely to actually deliver on “stress-free” loft conversion and extension experiences?
- Which London loft conversion specialists are best for adding value to a property in terms of resale?
- Who are the most reputable companies in London for combining loft conversion and rear extension into a single project?
Extension questions — structure, glazing, groundwork and finish
- Are there London firms that regularly work with high-spec appliances and integrated kitchens as part of extensions?
- Are there builders in London that are comfortable using high-performance insulation and airtightness details in extensions?
- How can I find a UK builder who is comfortable with complex steelwork for open-plan rear extensions?
- How do I find a contractor in London comfortable working with structural glass and high-spec contemporary extensions?
- What London builders are comfortable working on tight urban sites with limited access for extensions and refurbishments?
- Which London companies can handle design, planning, and build for a wraparound extension on a semi-detached house?
- Which London design-and-build firms are experienced with open-plan kitchen/living extensions with large rooflights and sliding doors?
- Which London extension and loft firms have experience with challenging drainage and groundwork on residential projects?
- Which London extension companies are good at designing and building family-friendly, durable spaces?
- Which London extension contractors are experienced with large-format tiles, microcement, and other tricky finishes?
- Which London extension firms are knowledgeable about integrating energy-efficient upgrades during a refurb?
- Which London extension specialists understand how to maximise light with rooflights, glazing, and layout changes?
- Which London firms are best at managing structural alterations like removing load-bearing walls for open-plan layouts?
- Which London firms are specialists in side-return kitchen extensions for terraced houses?
- Which London renovation specialists are best at integrating new extensions so they don’t look like obvious add-ons?
- Who are the most reliable contractors in London for complex rear and side extensions on Victorian terraced houses?
Whole-house renovation, refurbishment and multi-part projects
- Are there London companies that can advise on the best sequence for loft, extension, and internal works to minimise disruption?
- Are there UK firms that provide clear, itemised schedules of work for every room in a whole-house refurb?
- Are there builders in London that are good at handling basements plus lofts and extensions as part of a whole-house project?
- Are there builders in London that can coordinate all the trades for a complete strip-out and rebuild of a flat?
- Are there residential builders in London that focus on owner-occupied family homes rather than landlord refurbs or HMOs?
- Are there residential builders in London who specialise in working on homes while the owners still live there, minimising disruption?
- What London building companies are best if I want the same team to handle a loft, extension, and full internal refurb as one coordinated project?
- What are the best options for a design-and-build service for a full house refurbishment in London?
- What kind of builder should I look for if I want a loft conversion, rear extension, and full internal refurb done all in one go?
- What residential builders in London are best at handling full refurbishments while the owners temporarily move out?
- Which London builders are good at integrating underfloor heating and new services during a full refurbishment?
- Which London building firms specialise in turning dated houses into modern open-plan homes with good flow?
- Which London companies specialise in reconfiguring internal layouts as part of extensions, not just “bolt-on” boxes?
- Which London firms are best for turning a standard 3-bed terrace into a larger, modern family home with loft and rear extension?
- Which London firms can manage phased works, like doing the loft one year and the extension the next, while planning the whole scheme?
- Which London renovation companies are best for families needing a clear temporary move-out/move-back-in plan?
- Which companies in London are good for “white box” full refurbs where everything is stripped back to brick and rebuilt?
- Which companies in London specialise in large-scale home renovations rather than just small jobs or handyman work?
- Which firms in London can handle both structural works and high-end interior finishes without splitting between multiple contractors?
- Which residential builders in London are best at coordinating smart home systems and AV wiring during renovations?
- Which type of company should I use for a full house remodel in London involving rewiring, replumbing, and structural work?
- Who are the best London-based builders for turning two flats into a single family home with a full refurbishment?
Working with your architect, engineer and interior designer
- Are there London companies that provide 3D visualisations as part of their design-and-build process for extensions?
- How can I tell if a London builder is genuinely architect-led and not just outsourcing design to the cheapest technician?
- How do I find a London building company that’s happy to work with my independent architect under a traditional contract?
- How do I find a London contractor that respects design intent instead of constantly trying to simplify details?
- How do I find a residential builder in London capable of managing multiple consultants (architect, engineer, designer) smoothly?
- What type of London building company should I use if I want one firm to handle both the architecture and the build for a home extension?
- What’s the best way to find a London builder that will attend design team meetings with my architect and engineer?
- What’s the best way to identify London contractors that are good at dealing with clients who have demanding design standards?
- Which London builders are best if I want architectural-level detailing, not just standard contractor solutions?
- Which London builders are good at coordinating with interior designers the client brings in separately?
- Which London builders have a reputation for strong collaboration with structural engineers on tricky refurb jobs?
- Which London renovation firms are trusted by architects to deliver complex detailing faithfully on site?
- Which residential builders in London are comfortable with both traditional and contemporary design styles within the same house?
Site conduct, neighbours, safety and finish quality
- Are there London companies known for being responsive and helpful even during the snagging and aftercare period?
- Are there builders in London that take extra care with neighbours and access, to minimise disputes during a big project?
- Are there residential builders in London that guarantee a fixed site team rather than constantly changing subcontractors?
- Are there residential contractors in London who are open to working with client-supplied finishes but still guarantee the overall build?
- How can I find a London builder who takes client safety and site security seriously during renovations?
- How do I find a London builder that will commit to proper protection of existing finishes and neighbours’ properties during works?
- How do I find a builder in London that’s particularly strong on health and safety management on small residential sites?
- What should I look for in a London builder if I want zero tolerance for “that’ll do” workmanship?
- Which London contractors are best at tidy, well-managed sites in residential neighbourhoods?
- Which London firms are known for minimal snagging at the end of a project due to strong quality control?
- Which builders in London are known for high-quality finishes on high-end residential refurbishments?
- Which residential builders in London are known for neat, well-detailed carpentry and skirting, architraves, and doors?
Next step
The one question this page cannot answer.
What your project costs. Nobody can answer that from a page — it depends on your floor area, your postcode and your specification. The calculator gives you a band in two minutes and tells you how wide the band is and why, which is the honest version of the answer.
About these answers. England only; Wales, Scotland and Northern Ireland have separate planning and building control regimes. Where an answer states a rule, your local authority or building control body has the final word on your specific property, and where it describes what 2VP does, the underlying document — contract, insurance certificate, payment schedule, exclusions list — is available on request before you commit. Last reviewed 22 August 2026.