Refresh both existing apartments
PLN 45–65 thousandPainting and flooring. Existing installations are retained.CONCEPT-STAGE COST ESTIMATE · 11 SEPTEMBER 2026
A clear scope.
Transparent assumptions.
Refreshing two apartments and adding a lightweight storey. Options with an ordinary roof or an open 50 m² rooftop terrace.
Gross amounts include materials and labour. Each group shows a separate 10% contingency. These are planning allowances developed from public price lists and the owner’s information, not a quotation following a site inspection.
The existing rooms in the two apartments total approximately 128.39 m², excluding the shared staircase and terrace. The estimate assumes approximately 460 m² of walls and ceilings and 115 m² of flooring. Quantities require a measured survey.
Extra storey without a terrace
PLN 299–410 thousandApproximately 50 m² ready for finishing, including design and roof.Extra storey with a terrace
PLN 366–520 thousandThe same scope plus an approximately 50 m² open terrace and access from the shared staircase.Refresh both existing apartments
| Scope | Quantity | Gross unit rate | Gross amount |
|---|---|---|---|
| Painting walls and ceilingsPaint, two coats, local repairs and priming; no full-house skim coating. | 460 m² | 35 PLN – 48 PLN | 16 100 PLN – 22 080 PLN |
| New flooring panels, underlay and installationFloors outside bathrooms; economy / mid-range specification. | 115 m² | 140 PLN – 200 PLN | 16 100 PLN – 23 000 PLN |
| Removing existing floor finishesWithout removing all floor screeds. | 115 m² | 20 PLN – 32 PLN | 2 300 PLN – 3 680 PLN |
| Skirting and thresholds, installedProvisional quantity, subject to measurement. | 110 linear m | 30 PLN – 45 PLN | 3 300 PLN – 4 950 PLN |
| Local subfloor levellingAllowance for a limited area; the contractor must check beneath the flooring. | 20 m² | 70 PLN – 110 PLN | 1 400 PLN – 2 200 PLN |
| Protection, transport, waste and cleaningTwo apartments with a combined room area of approximately 128.39 m². | 1 package | 2 000 PLN – 3 500 PLN | 2 000 PLN – 3 500 PLN |
| 10% contingency | — | — | 4 120 PLN – 5 941 PLN |
| Total including contingency | — | — | 45 320 PLN – 65 351 PLN |
Approximately 50 m² extra storey without an accessible terrace
| Scope | Quantity | Gross unit rate | Gross amount |
|---|---|---|---|
| Design, structural assessment and formalitiesArchitectural and structural design, survey, assessment and permit documentation. A planning allowance, not a schedule of official permit fees. | 1 package | 30 000 PLN – 40 000 PLN | 30 000 PLN – 40 000 PLN |
| Organising works at heightCrane, safety measures, transport, waste and site supervision. | 1 package | 10 000 PLN – 16 000 PLN | 10 000 PLN – 16 000 PLN |
| Removing the old roof and protecting the houseRemoval of covering and roof structure, temporary rain protection; without stripping out the existing apartments. | 1 package | 14 000 PLN – 22 000 PLN | 14 000 PLN – 22 000 PLN |
| Lightweight structure, insulation, windows and new roofStructural timber, sheathing, insulation, new-storey facade, windows, entrance door and a standard watertight flat roof. No new-house foundation. | 50 m² | 2 700 PLN – 3 400 PLN | 135 000 PLN – 170 000 PLN |
| Preparing the new apartment for finishingPartitions, linings, floor substrates, electricity, plumbing, heating and ventilation for the new floor only. No furniture, kitchen, appliances, finished flooring or sanitary fixtures. | 50 m² | 1 150 PLN – 1 550 PLN | 57 500 PLN – 77 500 PLN |
| Adapting the existing staircase to the new floorAccess to the apartment, enclosures and work at attic level. Further access to the rooftop terrace is priced separately. | 1 package | 10 000 PLN – 18 000 PLN | 10 000 PLN – 18 000 PLN |
| Local structural connections and adaptationsProvisional allowance for lightweight-extension support details. Excludes major foundation or wall reinforcement and replacement of the existing floor structure. | 1 package | 10 000 PLN – 20 000 PLN | 10 000 PLN – 20 000 PLN |
| Relocating the solar installationRemoval, reinstallation and commissioning. The future location of the 5.5 kW system must be agreed with the designer. | 1 package | 5 000 PLN – 9 000 PLN | 5 000 PLN – 9 000 PLN |
| 10% contingency | — | — | 27 150 PLN – 37 250 PLN |
| Total including contingency | — | — | 298 650 PLN – 409 750 PLN |
Extra cost: approximately 50 m² open rooftop terrace
| Scope | Quantity | Gross unit rate | Gross amount |
|---|---|---|---|
| Adapting the new roof for terrace loadsIncrement over the non-accessible roof in the extra-storey option. Final structural requirements depend on calculations. | 1 package | 10 000 PLN – 18 000 PLN | 10 000 PLN – 18 000 PLN |
| Additional waterproofing protection and drainage detailsProtective layers, thresholds, outlets and details below the deck. The basic watertight roof is already included in the extra-storey cost. | 50 m² | 120 PLN – 220 PLN | 6 000 PLN – 11 000 PLN |
| Timber deck, support system and installationTreated pine or larch in a simple layout. Deck supports must not puncture the membrane and must allow access to drainage. | 50 m² | 400 PLN – 600 PLN | 20 000 PLN – 30 000 PLN |
| Solid, opaque terrace parapetIncrement over an ordinary roof parapet for the required height and finish; no glass. Length subject to measurement. | 30 linear m | 220 PLN – 370 PLN | 6 600 PLN – 11 100 PLN |
| Shared stairs to the roof and lockable exit enclosureExtending the garden-side shared staircase, with the required flight arrangement and a small enclosure with a door. No private stairs inside the apartment. | 1 package | 18 000 PLN – 28 000 PLN | 18 000 PLN – 28 000 PLN |
| Outdoor lighting and socketBasic electrical fittings; no furniture, pergola or terrace canopy. | 1 package | 1 000 PLN – 2 000 PLN | 1 000 PLN – 2 000 PLN |
| 10% contingency | — | — | 6 160 PLN – 10 010 PLN |
| Total including contingency | — | — | 67 760 PLN – 110 110 PLN |
Optional: refresh the existing facade
| Scope | Quantity | Gross unit rate | Gross amount |
|---|---|---|---|
| Cleaning, local repairs and paintingExisting insulated facade, without replacing all insulation. Provisional area. | 200 m² | 80 PLN – 120 PLN | 16 000 PLN – 24 000 PLN |
| Access and protectionScaffolding / access platform. Combining this with the extension may reduce costs, subject to a contractor’s quote. | 1 package | 3 000 PLN – 5 000 PLN | 3 000 PLN – 5 000 PLN |
| 10% contingency | — | — | 1 900 PLN – 2 900 PLN |
| Total including contingency | — | — | 20 900 PLN – 31 900 PLN |
Optional: finish the new apartment
| Scope | Quantity | Gross unit rate | Gross amount |
|---|---|---|---|
| Painting, flooring, internal doors and a basic bathroomAdditional to the ready-for-finishing scope. Excludes kitchen cabinetry, appliances and movable furniture. | 50 m² | 700 PLN – 1 100 PLN | 35 000 PLN – 55 000 PLN |
| 10% contingency | — | — | 3 500 PLN – 5 500 PLN |
| Total including contingency | — | — | 38 500 PLN – 60 500 PLN |
What does the combined outlay include?
Example: purchase + refreshing both apartments + extra storey with terrace, ready for finishing. Facade work and finishing the new apartment are the optional items above.
| Item | Gross range |
|---|---|
| House purchase | 1 499 000 PLN |
| Property transfer tax (PCC), if payable: 2% | 29 980 PLN |
| Notary, registration and copies — allowance | 4 000 PLN – 8 000 PLN |
| Refresh both existing apartments | 45 320 PLN – 65 351 PLN |
| Extra storey with terrace, ready for finishing | 366 410 PLN – 519 860 PLN |
| Purchase and specified works, including works contingency | 1 944 710 PLN – 2 122 191 PLN |
Outside this total: furniture, kitchens and appliances; optional facade works; finishing the new apartment; finance and holding costs during construction; creation of separate legal titles; any selling costs and taxes. This is not the full cost of moving into the new apartment or of a resale project.
Major foundation or wall reinforcement and replacement of the existing floor structure have not been priced. If the assessment identifies these needs, the budget must be extended. A 10% contingency does not replace that assessment. Connecting the new apartment assumes sufficient utility capacity; any upgrade also requires a quote.
The option without a terrace provides the same new apartment with an ordinary flat roof. Its basic structure, insulation and waterproofing are not counted again when adding the deck.
Why is this estimate lower?
Works in the existing apartments are limited to refreshing. Sound installations and the boiler are retained. Furnishings, ancillary-space renovation and a full common-area overhaul are excluded. The extra storey assumes a simple lightweight timber structure and an economical specification.
Design and assessment share a PLN 30–40 thousand allowance; demolition, crane access and construction have separate line items. Timber forms the terrace’s walking surface, but structural capacity, waterproofing, drainage and safe shared-stair access from the garden side are still required.
Visualisations illustrate a possible furnished design, not the base estimate’s scope. Structural boards, insulation, fire protection and acoustics must be specified by the designer. Decorative SPC / Rocko panels do not by themselves replace a complete wall system.
MARKET / POINTS OF COMPARISON
Check the prices.
Compare what is included.
These are three specific Grochów listings that were read and checked. They show asking prices, not completed transaction prices or a valuation of this property. Checked on 11 September 2026. Listings may later change price or be withdrawn.
LISTING · Garwolińska
799 000 PLN
48 m² · 16 646 PLN/m²
Three rooms, floor 2 of 3, balcony; high standard.
Apartment in a multi-unit building, without a private garden or rooftop terrace.
Open this listing ↗LISTING · Makowska
650 000 PLN
49.69 m² · 13 081 PLN/m²
Two rooms, floor 1 of 3, balcony; furnished.
The description states 49.69 m²; the headline rounds it to 50 m². The price per m² uses the more precise area.
Open this listing ↗LISTING · Łukowska · villa floor
990 000 PLN
84.2 m² · 11 758 PLN/m²
An entire floor of a semi-detached house, an approximately 200 m² garden, garage and basements.
Requires a full renovation. Different condition, area and land rights; not directly comparable to a finished apartment.
Open this listing ↗COMPLETED TRANSACTIONS
Public Property Price Register
In Geoportal, select the RCN module, search for “ks. Jana Sztuki 15, Warszawa”, then set residential units, transaction dates and a search radius. Compare similar floor areas and full ownership interests.
The data sample retrieved for the immediate neighbourhood did not contain records from which we could calculate a local median. We therefore do not present one as a fact. No records in this sample does not mean there were no transactions.
No verified matched pair of otherwise identical 50 m² apartments, one with a 50 m² roof terrace and one without, was found. We therefore do not assign an automatic percentage premium to the terrace. View current Grochów listings ↗
Sources and estimating method
- WOODPECKER · Aligator manufacturer’s offer, March 2026 ↗
Approximately 50 m² house: PLN 117,108 + PLN 85,532 = PLN 202,640 gross (8% VAT), ready for finishing, excluding the foundation and options. The manufacturer adds site organisation costs. This is a technology benchmark, not a quote for extending Sztuki 15.
- ADREM · Warsaw labour price list ↗
Net labour rates from: painting PLN 20/m², panel installation PLN 65/m² and removal PLN 25/m². Our ranges are gross and also include materials; the lower option requires straightforward work and comparison of contractor quotes.
- Tarasy Wesoła · materials and installation costs ↗
Ground-level decks including materials and installation: a broad PLN 250–900/m² range, excluding ground preparation. This is not the cost of a complete accessible roof. The Aligator manufacturer also lists an 18 m² pine deck at PLN 9,000 gross, or PLN 500/m².
- CHATOS · facade works price list ↗
A supporting reference for facade painting; final area, access and repairs require measurement.
- Ministry of Finance · PCC rates ↗
The secondary-market purchase example assumes 2% PCC if payable. A notary must assess any exemption for the particular buyer.
- GUGiK · Property Price Register ↗
Public data on completed transactions. Availability and coverage must be checked for the selected area.
Other items — design, demolition, structural increments, shared-stair roof access and solar relocation — are explicit planning allowances. Public price lists are not individual quotes for this house. Obtain comparable quotes for the same scope and check VAT before contracting.